JP4801602B2 - Bending fatigue test equipment - Google Patents

Description

  The present invention relates to an improvement in a bending fatigue test apparatus, and more particularly to a bending fatigue test apparatus suitable for a double bending fatigue test of a ribbon-like thin plate.

  As a bending fatigue test apparatus and a bending test apparatus, for example, a bending fatigue test apparatus for an optical communication cable, a bending fatigue test apparatus using a reciprocating roller (hereinafter referred to as a bending fatigue test apparatus using a reciprocating roller), an image guide. A bending tester (hereinafter referred to as an image guide bending test apparatus) is known. The outline of the bending fatigue test apparatus and the bending test apparatus according to the conventional examples 1 to 3 will be described below with reference to the attached drawings.

  The bending fatigue test apparatus for optical communication cables according to Conventional Example 1 and the bending fatigue test apparatus will be described with reference to FIG. That is, the bending fatigue testing apparatus according to the conventional example 1 swings the swinging arm A around the swinging axis P, and sequentially measures the swinging angle, thereby providing a test piece (corresponding to a test object). The lower end of S is locked from the left and right via tension meters L, respectively. Then, the test piece S is bent at a radius R by the mandrel M, and the bending force applied to the test piece S is sequentially measured by the tension meter L. In the bending fatigue test by this bending fatigue test apparatus, one bending to the left and right is one cycle (Hertz), and the tension measurement value by the tension meter L is the vertical axis for each cycle, and the swing arm A swings. A hysteresis graph is taken for each cycle with the measured value of angle (θ) as the horizontal axis, and the bending fatigue of the optical communication cable is measured by calculating the area and intercept of the hysteresis graph for each bending cycle. In addition, in the patent document according to Conventional Example 1, an example in which a weight is attached to the lower end of a test piece is disclosed as a conventional example (see, for example, Patent Document 1).

A bending fatigue test apparatus using a reciprocating roller according to Conventional Example 2 will be described with reference to FIG. That is, the bending fatigue test apparatus 51 includes a pair of chuck portions 55 and 56 for gripping both ends of the device under test 60, and one surface of the device under test 60 disposed between the chuck portions 55 and 56. Two support members 57 and 58 that abut on 61 are provided.
Further, a reciprocating roller 52 that abuts against the other surface 62 opposite to the one surface 61 of the device under test 60 and imparts bending deformation to the device under test 60 between the support members 57 and 58 is provided. I have. Further, reciprocating when the pair of chucks 55, 56 line connecting a reference line L _C, the reciprocating roller 52 through the base portion 59, in a direction substantially parallel to the reference line L _C There is provided a roller moving means 53 to be applied and a tension generating means (tension spring) 54 for applying tension to the DUT 60 between the pair of chuck portions 55 and 56 (see, for example, Patent Document 2).

  A bending test apparatus using a reciprocating roller according to Conventional Example 3 will be described with reference to FIG. 8 in the plan view and FIG. 9 in the front view in order. 8 and 9, reference numeral 75 indicated by a two-dot chain line is an image guide for testing, and this image guide 75 is first sheave 71 → second sheave 72 → third sheave 73 → fourth sheave 74. Suspended sequentially with a central angle of about 80 degrees to about 200 degrees. The image guide 75 is continuously drawn in the direction of arrow A by a take-up machine (not shown), and the sheaves 71 to 74 are provided close to the box-shaped base 76.

More specifically, each of these sheaves 71 to 74 is divided into two pairs, and a pair consisting of the first sheave 71 and the second sheave 72 rotates in the vertical plane V as shown by a one-dot chain line in FIG. On the other hand, a pair of the third sheave 73 and the fourth sheave 74 is configured to rotate within the horizontal plane H as indicated by a one-dot chain line in FIG. That is, the first sheave 71 and the second sheave 72 are pivotally supported by a first rotating arm 78 that is rotatable and fixed in the directions of arrows B and C by a horizontal support shaft 77 protruding from the front surface of the base 76. Yes. Further, the third sheave 73 and the fourth sheave 74 are pivotally supported by a second pivot arm 80 that can be pivotally fixed in the directions of arrows E and F by a vertical support shaft 79 protruding from the upper surface of the base 76. . In the bending test of the image guide 75 by the bending test apparatus having such a configuration, the image guide 75 is continuously fed while being sequentially bent in four directions (for example, see Patent Document 3).
JP-A-10-281929 JP 2003-307478 A JP-A 61-260139

  Any of the bending fatigue test apparatus and the bending test apparatus according to the conventional examples 1 to 3 are considered to be useful as they are. However, each of these test apparatuses has the following problems.

  In the bending fatigue testing apparatus of the optical communication cable according to Conventional Example 1, when the test piece is placed along a mandrel having a radius of curvature R, a large tensile stress is generated in the test piece due to frictional force, and the test piece is broken. Cannot perform a rigorous bending fatigue test. When the test piece is an optical communication cable, the frictional force is considered not so large, but when the test piece is ribbon-shaped, the contact area is large and the frictional force is large, so the measurement data of the bending fatigue test is less. Become accurate. On the other hand, when the restraint by the mandrel is relaxed and the tensile stress is set to 0, a large bending deformation (plastic deformation) occurs after placing the test piece along the mandrel having the radius of curvature R, and an accurate bending fatigue test can be performed. Can not.

  In the bending fatigue testing apparatus using the reciprocating roller according to Conventional Example 2, the test object is bent along the curvature radii of the two supporting members, but only the bending fatigue test in the same direction can be performed. The bending fatigue test in both directions cannot be carried out. Therefore, it cannot be applied to a fatigue test of a member to be tested that is used for a purpose of undergoing bending in both directions or repeated expansion and contraction.

  The bending test apparatus using the reciprocating roller according to the conventional example 3 is not a bending fatigue test apparatus by bending the image guide for testing only once in four directions, and the configuration of the bending test apparatus is a ribbon shape. It cannot be applied to the DUT.

  Therefore, the object of the present invention is to carry out a more accurate bending fatigue test without causing local stress on the specimen under abnormal stress caused by frictional force, etc. It is to provide a bending fatigue testing device that can be made possible.

The inventors have realized the bending fatigue test apparatus according to the present invention in view of the situation described later. For example, a thin aluminum alloy is used for a heat exchanger or the like, but a large strain due to vibration or thermal strain is generated in the tension and compression directions in the heat exchanger, and the aluminum alloy may be fatigued. In particular, because it is thin, large strains may occur, and low cycle fatigue failure that occurs in a relatively short period of time often occurs. Therefore, the development of materials with a long life against low cycle fatigue is desired. Yes. However, the bending test apparatus according to the conventional example cannot perform an accurate bending fatigue test as described above.
Therefore, a bending fatigue testing device that can apply tensile and compressive loads even to ultra-thin test specimens, and can control strain without affecting work hardening and softening. Development of was desired.

  Therefore, the means adopted by the bending fatigue test apparatus according to claim 1 of the present invention is fitted to the mounting base, the arm driving device mounted on the mounting base, and the driving shaft of the arm driving device, and is preset. A swing arm that reciprocally swings within a specified range and an arc curved surface that is detachably fixed to a seat plate that can be adjusted in position on the mounting base and curved with a predetermined radius of curvature in opposite directions are formed on the same side. In addition, a pair of bending guide / clamping members that clamp one end of the object to be tested, and a test object that is slidably fitted to the distal end side of the swing arm, and one end side is clamped by the bending guide / clamping member A test object clamping member that clamps the other end of the body, a coil spring that is connected at one end to the distal end side of the swing arm, and biases the test object clamping member toward the distal end of the swing arm; It is formed between a bending start position at which the test object starts to bend by the swing of the arm and a clamping part end, and includes clamping pressure release means for releasing the clamping pressure on the test object. is there.

  The means employed by the bending fatigue testing apparatus according to claim 2 of the present invention is the bending fatigue testing apparatus according to claim 1, comprising a resin having a low friction coefficient on the arcuate curved surfaces of the pair of bending guide / holding members. A coating layer is formed.

  The means employed by the bending fatigue test apparatus according to claim 3 of the present invention is the bending fatigue test apparatus according to any one of claims 1 and 2, wherein the clamping pressure releasing means is the pair of the pair of fatigue tests. The bending guide / clamping member is formed on a surface on the side opposite to the other of at least one of the bending guide / clamping members, and is a relief portion in a direction perpendicular to the test object. is there.

  The means employed by the bending fatigue test apparatus according to claim 4 of the present invention is the bending fatigue test apparatus according to any one of claims 1 and 2, wherein the clamping pressure releasing means is the pair of the pair of It is a gap formed by a spacer interposed between at least one of the bending guide / holding members and the test object.

  The bending fatigue testing apparatus according to claim 5 of the present invention employs the bending fatigue testing apparatus according to claim 4, wherein the spacer is provided on a surface of the bending guide / holding member facing the object to be tested. It is characterized by being attached.

  The means employed by the bending fatigue testing apparatus according to claim 6 of the present invention is the bending fatigue testing apparatus according to any one of claims 1 to 5, wherein the bending guide / clamping member and the device under test are used. The body clamping member is provided with set position setting means for determining the set position of the device under test.

  According to the bending fatigue testing apparatus of the first to sixth aspects of the present invention, a pair of bending guide / holding members are repeatedly provided by the swing arm in which the test object urged by the coil spring toward the tip of the swing arm reciprocally swings. It is bent along the arcuate curved surface. In the bending fatigue test apparatus according to claim 1 of the present invention, the clamping fatigue release apparatus according to claim 4 of the present invention is provided by the clamping pressure release means, and in the bending fatigue test apparatus according to claim 3 of the present invention, by the relief portion. Because of the gap, the clamping pressure does not act between the bending start position of the DUT and the end of the clamping part, and only the tensile force by the coil spring acts on the DUT, and is hardly affected by the frictional force. An accurate bending fatigue test can be performed on the device under test.

  According to the bending fatigue test apparatus according to claim 2 of the present invention, since the coating layer made of a resin having a low friction coefficient is formed on the arcuate curved surface of the pair of bending guide / holding members, Almost no frictional force is generated between the arcuate curved surface and the DUT.

  According to the bending fatigue test apparatus according to claim 5 of the present invention, the spacer is attached to the surface of the bending guide / holding member facing the object to be tested, and the test is performed between the pair of bending guide / holding members. Since the device under test can be set only by holding the body, the time required for setting the device under test is shortened.

  According to the bending fatigue test apparatus of the sixth aspect of the present invention, the bending guide / holding member and the DUT holding member are provided with set position setting means for determining the set position of the DUT, Can be easily set, so the time required for setting the DUT is shortened.

  Hereinafter, the configuration of a bending fatigue test apparatus according to an embodiment of the present invention will be described with reference to the drawings sequentially. FIG. 1 is a partially cutaway front view of a bending fatigue test apparatus according to an embodiment of the present invention, and FIG. 2 is a partially cutaway side view of the bending fatigue test apparatus according to an embodiment of the present invention. FIG. 3 is an explanatory diagram of a state in which the test object is held by the bending guide / holding member of the bending fatigue testing apparatus according to the embodiment of the present invention, and FIG. 4 is a bending guide / bending guide of the bending fatigue testing apparatus according to the embodiment of the present invention. FIG. 5 is another explanatory diagram of the clamping state of the test object by the bending guide / holding member of the bending fatigue test apparatus according to the embodiment of the present invention. is there.

  Reference numeral 1 shown in FIGS. 1 and 2 is a bending fatigue test apparatus according to an embodiment of the present invention. The bending fatigue test apparatus 1 includes, for example, a base plate 2a installed on a work table and the base plate. 2a is welded vertically to the vertical plate 2b, the upper surface of both end portions in the width direction of the base plate 2a, and the back surface of both end portions in the width direction of the vertical plate 2b. There is provided a mounting base 2 composed of Γ-shaped ribs 2c and 2c. A motor mounting seat is formed at a position slightly below the upper end of the vertical plate 2b of the mounting base 2, and an end surface of the stepping motor 8 as an arm driving device on the side of the reversibly rotating drive shaft 8a is formed on the motor mounting seat. It is abutted and mounted horizontally.

The drive shaft 8a of the stepping motor 8 is opened at the center of the motor mounting seat and protrudes from the hole to the front side of the mounting base 2. A swing arm 9 is fitted to the projecting end of the drive shaft 8a of the stepping motor 8 from the mounting base 2, and a shaft hole provided at the base end thereof is fitted, and a slit opened from the shaft hole to the end surface. Is firmly fixed by being narrowed with bolts and nuts. The swing arm 9 is configured to reciprocate between predetermined ranges by reversible rotation of the drive shaft 8 a of the stepping motor 8.
Then, in the central portion of the swing arm 9 in the width direction, a test object detection elongated hole 9a for detecting a fracture of the test object, which will be described later, and a reduction of a coil spring, which will be described later, are detected along the longitudinal direction. For this purpose, a coil spring expansion / contraction detection hole 9b is provided.

  A bracket 3 having a rectangular shape in plan view is horizontally attached to the upper end surface of the vertical plate 2b of the mounting base 2 and at the center position in the width direction. A height position adjusting screw 4 whose lower end protrudes downward on the front side of the vertical plate 2b is vertically attached to the bracket 3, and will be described later by adjusting the screwing length of the height position adjusting screw 4. The height position of the seat plate 5 is configured to be finely adjusted. Each of both end portions in the width direction of the seat plate 5 is provided with two long holes having a long diameter in the height direction, and bolts passed through these long holes are provided on the mounting base 2. By being screwed into the screw holes of a pair of tapped blocks provided on the front side, they are fixed vertically.

  A circular arc formed on the front surface of the seat plate 5 with a predetermined curvature radius in the opposite direction and having a low friction coefficient on the surface, for example, a coating layer (not shown) made of tetrafluoroethylene resin. A curved surface R is formed on the lower side, and a pair of bending guide / clamping members 6 and 7 that clamp one end of a ribbon-like object 16 made of a thin aluminum alloy plate are detachably fixed by bolts. . The pair of bending guide / clamping members 6, 7 are located between the bending start position 17 where the test object 16 starts to be bent by the swing of the swing arm 9 and the clamping part end 18 with respect to the test object 16. A clamping pressure release means 20 that releases the clamping pressure and has a configuration described later is formed.

  By the way, in the embodiment of the present invention, as described above, a coating layer made of a tetrafluoroethylene resin is formed on the arcuate curved surface R of each of the pair of bending guide / holding members 6 and 7. However, even if the coating layer is not necessarily formed, by smoothly processing the surface of the arcuate curved surface R, it is possible to reduce the frictional force against the device under test, so that it can fulfill its function.

  As shown in FIG. 3, the clamping pressure release means 20 is formed on each of the opposing surfaces of the pair of bending guide / clamping members 6, 7 in a direction orthogonal to the DUT 16. It is made up of escaped parts. As described above, the clamping pressure release means 20 is formed on each of the opposing surfaces of the pair of bending guide / clamping members 6 and 7 when the clamping pressure acts on the bending start position 17 of the DUT 16. This is because a pinching force and a tensile force by a coil spring which will be described later act on the bending start position 17 of the DUT 16, so that an accurate bending fatigue test cannot be performed.

  By the way, in the case of the bending fatigue test apparatus 1 according to the embodiment of the present invention, as described above, the relief portion which is the clamping pressure release means 20 is formed on the surface on the opposite side of the pair of bending guide and clamping members 6 and 7. Each is formed. However, the present invention is not limited to this configuration, and the same effect can be obtained as long as it is formed on the surface of the pair of bending guide / clamping members 6 and 7 that faces at least one of the other bending guide / clamping members. Can be obtained.

  As shown in FIG. 4, the clamping pressure release means 20 is a spacer 19 interposed between the pair of test objects 16 on opposite sides of the pair of bending guide / clamping members 6 and 7. , 19 are formed by gaps. Of course, even in this case, the spacer 19 may be interposed between at least one of the pair of bending guide / holding members 6 and 7 and the device under test 16. The spacer 19 may be configured to be attached to the bending guide / holding members 6 and 7. When the spacer 19 is attached to the bending guide / clamping members 6 and 7 in this way, the DUT 16 can be set only by clamping the DUT 16 between the pair of bending guide / clamping members 6 and 7. In addition, since the time required for setting the device under test 16 is shortened, the efficiency improvement effect of the bending fatigue test can be expected.

  At the front end side of the swing arm 9, the other end of the DUT 16 held by the bending guide / holding members 6, 7 is connected to a protruding plate portion and a fixed plate 11 that is fixed to the protruding plate portion. The test subject clamping member 10 that is clamped between the two is slidably fitted. The other end of the coil spring 12, one end of which is locked to the protruding plate portion of the member to be tested holding member 10, is screwed into a screw hole provided in a bent portion on the tip end side of the swing arm 9. The tension adjusting screw 13 is locked to the tip portion.

  Accordingly, since the member-under-holding member 10 is continuously urged by the coil spring 12 toward the tip of the swing arm 9, the tensile force of the coil spring 12 is applied to the device under test 16 via the member-under-holding member 10. Both bendings are repeated in a state where is given. Incidentally, it is preferable that the tensile force applied to the ribbon-shaped DUT 16 made of an aluminum alloy having a cross-sectional dimension (width × thickness) of 10 mm × 0.2 mm is about 4.9 N (500 g).

The bending guide / holding members 6 and 7 and the device under test holding member 10 are provided with set position setting means for determining the set position of the device under test 16. The set position setting means, an outer surface of the left side of the bending guide-pinching member 6 in FIG. 1, and a set bolt B _S of the seat plate 5 side, the swing arm 9 side set in Figure 2 of the fixing plate 11 and a combination of bolt B _S. Therefore, the set position setting means can easily set the device under test 16, and the time required for setting the device under test 16 can be shortened. This greatly contributes to improving the efficiency of the bending fatigue test of the device under test 16. can do.

  Furthermore, a large rectangular hole is provided from the middle to the lower side in the vertical direction of the vertical plate 2b of the mounting base 2, and the test object 16 is broken by straddling the upper side and the opening of the hole. A test object displacement detection sensor 14 comprising a laser displacement meter for detecting deformation through a test object detection slot 9a provided in the swing arm 9 is provided. A coil comprising a laser displacement meter that detects the reduction of the coil spring 12 due to the breakage of the device under test 16 through the coil spring detection elongated hole 9b provided in the swing arm 9 across the lower side and the opening of the punched hole. A spring expansion / contraction detection sensor 15 is provided.

  In the case of the bending fatigue test apparatus 1 according to the embodiment of the present invention, as described above, the detection sensors 14 and 15 including a laser displacement meter are used. Breakage of the DUT 16 can be detected from the change in resistance. Therefore, the detection sensor is not limited to a laser displacement meter. In addition, the vertical plate 2b of the mounting base 2 is provided with a rectangular hole, but this hole may not be provided without any influence on the function of the bending fatigue test apparatus 1, It is merely provided for reducing the weight of the mounting base 2.

  Hereinafter, the operation mode of the bending fatigue test apparatus 1 according to the embodiment of the present invention will be described. That is, according to the bending fatigue testing apparatus 1 according to the embodiment of the present invention, the pair of test objects 16 urged toward the distal end of the swing arm 9 by the coil spring 12 is repeatedly moved by the swing arm 9 that reciprocally swings. The bending guide / clamping members 6 and 7 are bent along the arcuate curved surface R.

  In the bending fatigue test as described above in which the device under test 16 is repeatedly bent in both directions, the bending start position 17 of the device under test 16 and the holding portion end 18 due to the presence of the holding pressure release means (relief portion, gap) 20. There is no such thing as a pinching pressure acting between them. Furthermore, since a coating layer made of a tetrafluoroethylene resin is formed on the surface of the arcuate curved surface R of the pair of bending guide / clamping members 6, 7, almost a frictional force acts on the DUT 16. There is nothing. Therefore, according to the bending fatigue test apparatus 1 according to the embodiment of the present invention, only the tensile force by the coil spring 12 acts on the device under test 16, so that an accurate bending fatigue test is performed on the device under test 16. Can be implemented.

  In the bending fatigue testing apparatus 1 according to the above embodiment, the case where the arcuate curved surface R is formed in each of the bending guide / holding members 6 and 7 and the device under test 16 is bent in both directions has been described as an example. . However, the present invention is not limited to this, for example, as shown in FIG. 5, the bending guide / clamping member 6 in which the arcuate curved surface R is formed, and the vertical dimension is smaller than the bending guide / clamping member 6 by at least R of the arcuate curved surface R. By using a rectangular holding member 7 ′ having no arcuate curved surface R and swinging the swing arm at a predetermined angle from the vertical state to one side, a bending fatigue test can be performed only in one side of the DUT 16. . Of course, even in the bending fatigue testing apparatus 1 having a configuration in which the curved curved surface R is formed on each of the bending guide / holding members 6 and 7, the swing arm can be swung from the vertical state to one side by a predetermined angle. It is possible to perform a bending fatigue test only in one direction of the DUT 16.

  In the above description, the bending fatigue test apparatus 1 according to the embodiment of the present invention has been described as an example in which the bending fatigue test apparatus 1 is applied to a bending fatigue test of a ribbon-shaped object 16 made of a thin aluminum alloy plate. The present invention can be applied not only to the bending fatigue test of the ribbon-shaped test object 16 but also to the bending fatigue test of the linear test object. Further, the present invention can also be applied to a bending fatigue test of a specimen to be tested other than an aluminum alloy. The bending fatigue test apparatus 1 according to the embodiment of the present invention is only one specific example of the present invention, and is not limited to the form of the bending fatigue test apparatus according to the above embodiment. Design changes and the like can be freely made without departing from the technical idea.

It is a partially notched front view of the bending fatigue test apparatus which concerns on embodiment of this invention. 1 is a partially cutaway side view of a bending fatigue test apparatus according to an embodiment of the present invention. It is explanatory drawing state of the to-be-tested object by the bending guide and the clamping member of the bending fatigue testing apparatus which concerns on embodiment of this invention. It is explanatory drawing of the other clamping state of the to-be-tested object by the bending guide and clamping member of the bending fatigue test apparatus which concerns on embodiment of this invention. It is another clamping state explanatory drawing of the to-be-tested object by the bending guide and clamping member of the bending fatigue testing apparatus which concerns on embodiment of this invention. It is explanatory drawing of the bending fatigue test apparatus of the optical communication cable which concerns on the prior art example 1. FIG. It is explanatory drawing which shows the structure of the bending fatigue test apparatus using the reciprocating roller which concerns on the prior art example 2. FIG. It is a top view of the bending test apparatus using the reciprocating roller which concerns on the prior art example 3. FIG. It is a front view of the bending test apparatus using the reciprocating roller which concerns on the prior art example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bending fatigue test apparatus 2 ... Mounting stand, 2a ... Base plate, 2b ... Vertical plate, 2c ... Rib 3 ... Bracket 4 ... Height adjusting screw 5 ... Seat plate 6 ... Bending guide / clamping member 7 ... Bending guide / clamping 7, a rectangular clamping member 8, an arm drive device, 8 a, a drive shaft 9, a swing arm, 9 a, a long hole for detecting a displacement of a specimen, 9 b, a long hole for detecting a spring expansion / contraction 10, a specimen clamping member 11 DESCRIPTION OF SYMBOLS ... Fixing plate 12 ... Coil spring 13 ... Tension adjusting screw 14 ... Test object displacement detection sensor 15 ... Coil spring expansion / contraction detection sensor 16 ... Test object 17 ... Bending start position 18 ... Nipping part end 19 ... Spacer 20 ... Nipping pressure release Means (flank, gap)
R: Arc curved surface of bending guide / clamping member B _S : Set bolt

Claims (6)

  A mounting frame, an arm driving device mounted on the mounting frame, a swing arm that is fitted on a driving shaft of the arm driving device and swings back and forth within a preset range, and is adjustable on the mounting frame. A pair of bending guides / clamping members that are detachably fixed to a seat plate provided and are curved on the same side with a predetermined radius of curvature in opposite directions, and that clamp one end of the device under test; A test object clamping member that is slidably fitted on the front end side of the swing arm and that has one end side clamped by the bending guide / clamping member, and a test object clamping member that clamps the other end of the test object. One end side is connected to the side, a coil spring that urges the specimen holding member toward the distal end of the swing arm, and a bend in which the specimen begins to bend due to the swing of the swing arm Is formed between the location and the clamping unit ends, said bend characterized in that it consists of a clamping pressure opening means for opening the nip pressure against the test object fatigue testing device.   2. The bending fatigue testing apparatus according to claim 1, wherein a coating layer made of a resin having a low friction coefficient is formed on the arcuate curved surfaces of the pair of bending guide / clamping members.   The clamping pressure release means is formed on a surface of at least one of the pair of bending guide / clamping members facing the other of the bending guide / clamping members, and escapes in a direction perpendicular to the test object. The bending fatigue test apparatus according to claim 1, wherein the bending fatigue test apparatus is a part.   The clamping pressure releasing means is a gap formed by a spacer interposed between at least one of the pair of bending guide / clamping members and the device under test. The bending fatigue test apparatus according to any one of items 1 and 2.   5. The bending fatigue testing apparatus according to claim 4, wherein the spacer is attached to a surface of the bending guide / holding member facing the object to be tested.   6. The bending guide / clamping member and the DUT clamping member are each provided with a set position setting means for determining a set position of the DUT. Bending fatigue testing device described in 1.

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