JP2769262B2 - Strength test method under biaxial stress - Google Patents
Strength test method under biaxial stressInfo
- Publication number
- JP2769262B2 JP2769262B2 JP4064000A JP6400092A JP2769262B2 JP 2769262 B2 JP2769262 B2 JP 2769262B2 JP 4064000 A JP4064000 A JP 4064000A JP 6400092 A JP6400092 A JP 6400092A JP 2769262 B2 JP2769262 B2 JP 2769262B2
- Authority
- JP
- Japan
- Prior art keywords
- test piece
- fulcrum
- stress
- distance
- test
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000010998 test method Methods 0.000 title claims description 12
- 238000012360 testing method Methods 0.000 claims description 87
- 238000004364 calculation method Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 229910010293 ceramic material Inorganic materials 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000010972 statistical evaluation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0254—Biaxial, the forces being applied along two normal axes of the specimen
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、セラミック等の材料の
二軸応力下における強度試験方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for testing the strength of a material such as ceramic under biaxial stress.
【０００２】[0002]
【従来の技術】近年、耐熱性、耐食性等に優れた特性を
有するセラミック材料は、加工技術の向上にともない、
車両部品等の比較的複雑な形状をもつ部品に用いられる
場合が多くなっている。このため、セラミック材料の多
軸応力下における種々の強度試験方法が提案されてい
る。2. Description of the Related Art In recent years, ceramic materials having excellent properties such as heat resistance, corrosion resistance, etc.
It is often used for parts having relatively complicated shapes such as vehicle parts. For this reason, various strength testing methods have been proposed for ceramic materials under multiaxial stress.
【０００３】従来より、このようなセラミック材料の多
軸応力下における強度試験として、試験片に引張応力お
よび圧縮応力を同時に負荷する引張圧縮二軸応力下にお
ける強度試験が知られる。例えば、この種の強度試験と
して行なわれる引張ねじり組合わせ試験は、丸棒状の試
験片に軸方向荷重およびねじり荷重を加えることによ
り、互いに直交する方向に引張応力および圧縮応力を負
荷するもので、また、内圧軸応力組合わせ試験は、円筒
状の試験片の周方向および軸方向に引張応力および圧縮
応力を負荷するものである。これらの強度試験方法は、
セラミック材料に限らず金属材料についても、いずれも
ＪＩＳ規格化はされていない。Conventionally, as a strength test of such a ceramic material under a multiaxial stress, a strength test under a tension-compression biaxial stress in which a tensile stress and a compression stress are simultaneously applied to a test piece is known. For example, a tensile torsion combination test performed as a strength test of this type applies a tensile stress and a compressive stress in directions orthogonal to each other by applying an axial load and a torsional load to a round bar-shaped test piece. In the internal pressure axial stress combination test, a tensile stress and a compressive stress are applied in a circumferential direction and an axial direction of a cylindrical test piece. These strength test methods are:
Not only ceramic materials but also metal materials are not JIS standardized.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の二軸応力下のセラミックスの強度試験方法
は、試験片に丸棒または円筒状のものを用いるため、試
験片の加工に比較的手間がかかる。また、試験片に荷重
を加える場合、セラミックスは塑性変形しないため、試
験片を正確に軸合せすることが難しく、試験片のセット
に長時間を要しやすいという問題がある。このため、試
験片のセットは、熟練者に任されることが多かった。However, in such a conventional method for testing the strength of ceramics under biaxial stress, a round bar or a cylindrical test piece is used. It takes. Further, when a load is applied to the test piece, since the ceramic does not undergo plastic deformation, it is difficult to accurately align the test piece, and there is a problem that it takes a long time to set the test piece. For this reason, the set of test pieces was often left to a skilled person.
【０００５】本発明は、このような問題点を解決するた
めになされたもので、比較的容易に作製可能な試験片を
用いて簡単な操作でかつ正確に引張応力および圧縮応力
を負荷可能にした二軸応力下における強度試験方法を提
供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is possible to apply a tensile stress and a compressive stress accurately by a simple operation using a test piece which can be relatively easily manufactured. It is an object of the present invention to provide a method for testing strength under biaxial stress.
【０００６】[0006]
【課題を解決するための手段】前記目的を達成するため
の本発明による二軸応力下における強度試験方法は、等
辺四角形の平板状の試験片を用いる二軸応力下における
強度試験方法であって、前記試験片の表面の第１対角線
の両端から前記第１対角線に沿って内側にそれぞれ等距
離Ａだけ離れた位置に第１支点を配置し、前記試験片の
裏面の第２対角線の両端から前記第２対角線に沿って内
側にそれぞれ等距離Ｂだけ離れた位置に第２支点を配置
し、前記第１支点と前記第２支点とに荷重を加えること
を特徴とする。According to the present invention, there is provided a strength test method under biaxial stress for achieving the above object, which is a test method under biaxial stress using an equilateral square plate-like test piece. A first fulcrum is disposed at a position separated from the opposite ends of the first diagonal of the front surface of the test piece by the same distance A inward along the first diagonal, respectively, from both ends of the second diagonal on the back surface of the test piece. A second fulcrum is disposed at a position separated by the same distance B inward along the second diagonal, and a load is applied to the first fulcrum and the second fulcrum.
【０００７】前記試験片に正方形の平板状の試験片を用
いることを特徴とする。前記第１対角線の一端から前記
第１支点までの距離Ａと、前記試験片の一辺の長さと厚
さとの積Ｃとの比を１２０／１．４≦Ｃ／Ａ≦１２０／
１．２とし、かつ、前記第２対角線の一端から前記第２
支点までの距離Ｂと、前記試験片の一辺の長さと厚さと
の積Ｃとの比を１２０／１．４≦Ｃ／Ｂ≦１２０／１．
２としたことを特徴する。The present invention is characterized in that a square plate-shaped test piece is used as the test piece. The ratio of the distance A from one end of the first diagonal line to the first fulcrum and the product C of the length and the thickness of one side of the test piece is 120 / 1.4 ≦ C / A ≦ 120 /
1.2, and from one end of the second diagonal line to the second
The ratio of the distance B to the fulcrum and the product C of the length and the thickness of one side of the test piece is set to 120 / 1.4 ≦ C / B ≦ 120/1.
2.
【０００８】[0008]
【作用】本発明の多軸応力下の強度試験方法によると、
試験片中央部に比較的広範囲にわたり引張圧縮二軸応力
がほぼ一様に発生する。このため、試験片の引張圧縮二
軸応力下の強度を比較的容易にかつ正確に求めることが
できる。本発明の二軸応力下における強度試験方法に例
えば一辺の長さが４０ｍｍ、厚さが３ｍｍの正方形の試
験片を用いた場合、図１に示すように、試験片１の表面
２の対角線３の一端から第１支点Ｐ1 までの支点距離Ａ
1 および裏面４の対角線５の一端から第２支点Ｐ2 まで
の支点距離Ｂ1 を同時に変化させると、試験片１の表面
または裏面の引張応力および圧縮応力の分布は、例えば
図２および図３に示すように変化する。According to the strength test method under multiaxial stress of the present invention,
Tension-compression biaxial stress is generated almost uniformly in the center of the specimen over a relatively wide range. For this reason, the strength of the test piece under the tension-compression biaxial stress can be relatively easily and accurately obtained. For example, when a square test piece having a side length of 40 mm and a thickness of 3 mm is used in the strength test method under biaxial stress of the present invention, as shown in FIG. fulcrum distance a from one end to the first supporting point P 1
1 and simultaneously changing the fulcrum distance B 1 from one end of the diagonal 5 of the back 4 to the second supporting point P 2, the distribution of the front or rear surface of the tensile stress and compressive stress test piece 1, for example 2 and 3 Changes as shown in FIG.
【０００９】図２に示すように、引張応力については、
支点距離Ａ1 およびＢ1 が比較的短いと、試験片中央部
より試験片周端部の方が引張応力が大きくなる。支点距
離Ａ 1 およびＢ1 が比較的長いと、試験片中央部で引張
応力が最大となり、試験片周端部にいくに従い徐々に引
張応力が低下していく。また、図３に示すように、試験
片の圧縮応力ついては、支点距離Ａ1 およびＢ1 が短く
なるに従い相対的に大きくなる。As shown in FIG. 2, regarding the tensile stress,
Fulcrum distance A1 And B1 Is relatively short, the center of the specimen
The tensile stress is larger at the peripheral end of the test piece than in the test piece. Fulcrum distance
Release A 1 And B1 Is relatively long, the tensile force
The stress reaches its maximum, and gradually pulls toward the end of the test piece.
Tensile stress decreases. Also, as shown in FIG.
For the compressive stress of a piece, the fulcrum distance A1 And B1 Is short
It becomes relatively large as it becomes.
【００１０】ここで、支点距離Ａ1 および支点距離Ｂ1
がともに１．３ｍｍのとき、試験片１の表面および裏面
の引張応力および圧縮応力は、交点Ｑ1 、Ｑ2 から対角
線に沿って約２０ｍｍの範囲を含む試験片中央部で一様
になる。このため、この値を選択すると、図１に示すよ
うな試験片１の表面２および裏面４のほぼ半分に相当す
る面積で応力を一様とすることができる。Here, the fulcrum distance A 1 and the fulcrum distance B 1
Are 1.3 mm, the tensile stress and the compressive stress on the front and back surfaces of the test piece 1 become uniform at the center of the test piece including a range of about 20 mm along the diagonal from the intersections Q 1 and Q 2 . Therefore, when this value is selected, the stress can be made uniform in an area corresponding to almost half of the front surface 2 and the back surface 4 of the test piece 1 as shown in FIG.
【００１１】本発明者は、正方形の試験片を用いる場
合、支点距離Ａ1 および支点距離Ｂ1を等しくすると
き、引張応力および圧縮応力を広範囲で一様にする最適
値を選択することで、材料力学的に試験片１を平等強さ
の梁とみた場合の簡単な計算方法により引張応力および
圧縮応力を計算することができることを見出した。例え
ば、図１に示すように、試験片１の厚さをｈ、試験片の
対角線の長さをＬ、他方の対角線の一端から交点までの
距離をＳとし、試験片に加える荷重をＰとすると、引張
応力および圧縮応力は、次の計算式、により求める
ことができる。The present inventor has found that, when a square test piece is used, when the fulcrum distance A 1 and the fulcrum distance B 1 are made equal, by selecting an optimum value for making the tensile stress and the compressive stress uniform over a wide range, It has been found that the tensile stress and the compressive stress can be calculated by a simple calculation method when the test piece 1 is regarded as a beam having equal strength in terms of material mechanics. For example, as shown in FIG. 1, the thickness of the test piece 1 is h, the length of the diagonal of the test piece is L, the distance from one end of the other diagonal to the intersection is S, and the load applied to the test piece is P. Then, the tensile stress and the compressive stress can be obtained by the following formulas.
【００１２】 引張応力＝３ＰＳ／Ｌｈ2 … 圧縮応力＝−３ＰＳ／Ｌｈ2 … 正方形の試験片では、Ｌ＝２Ｓである。また、本発明者
は、前記計算式により引張応力および圧縮応力を求める
ことが可能な支点距離Ａ1 および支点距離Ｂ1 の最適値
が試験片の一辺の長さＬおよび厚さｈに比例することを
見出した。すなわち、支点距離Ａ1 および支点距離Ｂ1
は、次式のような関係が成立するとき最適値となる。Tensile stress = 3 PS / Lh 2 ... Compressive stress = −3 PS / Lh 2 ... For a square test piece, L = 2S. Further, the inventor has determined that the optimal values of the fulcrum distance A 1 and the fulcrum distance B 1 from which the tensile stress and the compressive stress can be obtained by the above calculation formula are proportional to the length L and the thickness h of one side of the test piece. I found that. That is, the fulcrum distance A 1 and the fulcrum distance B 1
Is an optimum value when the following relationship is established.
【００１３】一辺の長さＬと厚さｈの積／支点距離Ａ1
＝１２０／１．３ または、 一辺の長さＬと厚さｈの積／支点距離Ｂ1 ＝１２０／
１．３ このため、前述したような一辺の長さが４０ｍｍ、厚さ
が３ｍｍの正方形の試験片を用いる場合、支点距離Ａ1
および支点距離Ｂ1 を１．３ｍｍとすると、引張応力お
よび圧縮応力は、前記計算式、により簡単に計算す
ることができる。さらにこの場合、支点距離Ａ1 および
支点距離Ｂ1 は、１．２〜１．４ｍｍの範囲内であれ
ば、前記計算式、により±１％の誤差の範囲内で引
張応力および圧縮応力を求めることができる。The product of the length L of one side and the thickness h / fulcrum distance A 1
= 120 / 1.3 or the product of length L of one side and thickness h / fulcrum distance B 1 = 120 /
1.3 For this reason, when a square test piece having a side length of 40 mm and a thickness of 3 mm as described above is used, the fulcrum distance A 1
And when the fulcrum distance B 1 and 1.3 mm, the tensile stress and compressive stress, the calculation formula, makes it possible to easily calculate. Further in this case, the fulcrum distance A 1 and the fulcrum distance B 1 represents, as long as it is within the range of 1.2～1.4Mm, the calculation formula, by obtaining the tensile and compressive stresses in the range of ± 1% of the error be able to.
【００１４】試験片として菱形等の等辺四角形のものを
用いる場合、対角線の長さが異なるため、一方の面は引
張応力が圧縮応力より大きく、他方の面では逆となる。
このため、前記計算式により引張応力および圧縮応力を
計算可能な支点距離は、長い対角線上の支点距離の方が
短い対角線上の支点距離よりも短くなるような最適値が
選定される。In the case of using an equilateral square shape such as a rhombus as a test piece, the tensile stress is larger than the compressive stress on one surface and opposite on the other surface because the lengths of the diagonal lines are different.
For this reason, the fulcrum distance at which the tensile stress and the compressive stress can be calculated by the above formula is selected to be an optimum value such that a long diagonal fulcrum distance is shorter than a short diagonal fulcrum distance.
【００１５】[0015]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。正方形の平板状の試験片に発生する引張応力およ
び圧縮応力を次に示すように調査した。試験片は、窒化
珪素焼結体の角板ブロックから研削加工により作製し、
寸法をほぼ４０×４０×３ｍｍとした。試験片の両面
は、＃８００のダイヤモンド砥石で研磨した。この材料
のヤング率は、２．７０×１０4 ｋｇｆ／ｍｍ2 であ
る。なお、この試験片の寸法は、ＪＩＳ Ｒ１６０１の
４点曲げ試験に用いる寸法４×３×４０ｍｍの角棒状の
試験片を作製するときの基礎となる平板寸法である。こ
のため、試験片は、比較的容易に作製することができ
た。Embodiments of the present invention will be described below with reference to the drawings. Tensile stress and compressive stress generated in a square plate-like test piece were investigated as follows. The test piece was prepared by grinding from a square block of silicon nitride sintered body,
The dimensions were approximately 40 × 40 × 3 mm. Both surfaces of the test piece were polished with a # 800 diamond grindstone. The Young's modulus of this material is 2.70 × 10 4 kgf / mm 2 . The dimensions of this test piece are the dimensions of a flat plate that is a basis for producing a square rod-shaped test piece of dimensions 4 × 3 × 40 mm used in a four-point bending test according to JIS R1601. Therefore, the test piece could be produced relatively easily.
【００１６】まず、図４および図５（Ｂ）に示すよう
に、試験片１０の底面１１の対角線ｌ2 上の所定位置に
支点１２ａ、１２ｂを設定し、次いで、図４および図５
（Ａ）に示すように、底面１１の頂面１３の対角線ｌ1
上の所定位置に支点１４ａ、１４ｂを設定する。そし
て、支点１２ａ、１２ｂにより試験片を水平に支持した
状態で、支点１４ａ、１４ｂにより頂面１３に垂直に４
００ｋｇｆの荷重を加えた。この場合、支点１２ａおよ
び１２ｂには、それぞれ２００ｋｇｆの荷重が加えられ
る。[0016] First, as shown in FIG. 4 and FIG. 5 (B), the set fulcrum 12a, and 12b at a predetermined position on a diagonal line l 2 of the bottom surface 11 of the specimen 10, then 4 and 5
As shown in (A), a diagonal line l 1 of the top surface 13 of the bottom surface 11 is shown.
The supporting points 14a and 14b are set at predetermined upper positions. Then, the fulcrum 12a, while horizontally supporting the specimen by 12b, the fulcrum 14a, 14b by vertically on the top surface 13 4
A load of 00 kgf was applied. In this case, a load of 200 kgf is applied to each of the fulcrums 12a and 12b.
【００１７】負荷装置には、万能試験機を用い、支点１
２ａ、１２ｂおよび支点１４ａ、１４ｂには、曲率半径
が２ｍｍの鋼球を用いた。応力値は、試験片の歪の測定
値に試験片材料のヤング率を乗じる計算方法と試験片を
平等強さの梁とみた場合の計算方法により求めた。な
お、歪の測定値にヤング率を乗じる応力値の計算方法に
ついては、セラミックスの場合、金属のような塑性変形
がほとんどないため、このような計算方法が可能とな
る。A universal testing machine is used as a load device, and a fulcrum 1
Steel balls having a radius of curvature of 2 mm were used for 2a, 12b and fulcrums 14a, 14b. The stress value was determined by a calculation method of multiplying the measured value of the strain of the test piece by the Young's modulus of the test piece material and a calculation method when the test piece was regarded as a beam having equal strength. In addition, as for the method of calculating the stress value by multiplying the measured value of the strain by the Young's modulus, in the case of ceramics, such a calculation method is possible because there is almost no plastic deformation unlike metal.
【００１８】試験片１０の歪の測定は、頂面１３に２軸
９０°交叉歪ゲージを貼付することにより行なった。歪
ゲージの軸は、試験片１０の対角線に平行にし、歪ゲー
ジの貼付位置は、図４および図５に示すように、頂面１
３の対角線の交点Ａと、対角線の交点Ａから対角線上に
１５ｍｍ離れた位置Ｂ〜Ｄとした。支点１２ａ、１２ｂ
および支点１４ａ、１４ｂの位置については、実施例１
および実施例２は、図４および図５に示す支点距離Ｌ1
および支点距離Ｌ2 を１．３ｍｍとし、実施例３は、
２．０ｍｍとした。The strain of the test piece 10 was measured by attaching a biaxial 90 ° cross strain gauge to the top surface 13. The axis of the strain gauge was parallel to the diagonal line of the test piece 10, and the position where the strain gauge was attached was, as shown in FIGS.
3 and positions B to D 15 mm diagonally away from the diagonal intersection A. Support points 12a, 12b
Regarding the positions of the fulcrums 14a and 14b,
In the second embodiment, the fulcrum distance L 1 shown in FIGS.
And the fulcrum distance L 2 is set to 1.3 mm.
2.0 mm.
【００１９】結果を表１に示す。The results are shown in Table 1.
【００２０】[0020]
【表１】 [Table 1]
【００２１】次に、比較例として、金属の分野で知られ
る鞍状曲げ試験について説明する。金属の分野では、多
軸疲労問題が盛んに研究されている。この種の試験は、
１９６５年頃から行なわれているもので、様々な応力比
で多軸応力下の疲労試験を行なうための試験方法として
考案されたうちの一つである。この種の試験は、例えば
菱形の平板状の試験片を鞍状に曲げる操作を試験片が破
損するまで繰返す。この場合、試験片は、試験片の四隅
先端で支持される。Next, a saddle bending test known in the field of metals will be described as a comparative example. In the field of metals, the problem of multiaxial fatigue has been actively studied. This type of test is
This method has been performed since about 1965 and is one of the methods devised as a test method for performing a fatigue test under multiaxial stress at various stress ratios. In this type of test, for example, an operation of bending a rhombic plate-shaped test piece into a saddle shape is repeated until the test piece is broken. In this case, the test piece is supported at the four corner tips of the test piece.
【００２２】比較例によると、材料力学的に試験片を平
等強さの梁とみた場合、四隅先端に荷重を加えたときに
試験片に一様な応力が発生すると予想されるが、試験片
の厚さを考慮した有限要素法による数値計算によれば、
応力が一様にならず、多軸応力下における材料の強度等
の正確な評価が困難である。比較例の場合、比較的薄い
平板状の試験片に即時破壊荷重より低い荷重で押す疲労
試験が行なわれていたため、応力評価に問題が少なかっ
たと思われる。しかしながら、セラミックの破壊試験の
場合、比較的薄い試験片を用いて高荷重で四隅先端に荷
重を加えると、欠け等の不具合が生じて試験の実施が困
難である。According to the comparative example, when the test piece is regarded as a beam of equal strength due to the material dynamics, it is expected that a uniform stress is generated in the test piece when a load is applied to the four corner tips. According to the numerical calculation by the finite element method considering the thickness of
Since the stress is not uniform, it is difficult to accurately evaluate the strength of the material under multiaxial stress. In the case of the comparative example, a fatigue test in which a relatively thin plate-shaped test piece was pressed with a load lower than the instantaneous breaking load was performed, so it seems that there were few problems in stress evaluation. However, in the case of a ceramic fracture test, if a load is applied to the four corner tips with a high load using a relatively thin test piece, defects such as chipping occur, and it is difficult to carry out the test.
【００２３】これに対し、前記実施例によると、試験片
１０の頂面１３および底面１１の四隅先端から離れた位
置に荷重を加えるため、試験片１０の四隅に欠け等が生
じることなく、確実にセラミックの破壊試験を実施する
ことができる。On the other hand, according to the above-described embodiment, since a load is applied to the top surface 13 and the bottom surface 11 of the test piece 10 at positions away from the four corner tips, the four corners of the test piece 10 can be reliably formed without chipping or the like. A destructive test of the ceramic can be performed.
【００２４】[0024]
【発明の効果】以上説明したように、本発明の二軸応力
下における強度試験方法によれば、比較的作製容易な試
験片を用いて引張圧縮二軸応力を簡単な操作で正確に測
定することができ、材料の統計的評価の信頼度を大幅に
向上させることができるという効果がある。As described above, according to the strength test method under biaxial stress of the present invention, the tensile and compressive biaxial stress can be accurately measured by a simple operation using a test piece which is relatively easy to manufacture. And the reliability of the statistical evaluation of the material can be greatly improved.
【図１】本発明の作用を説明するための実験に用いた試
験片を示す斜視図である。FIG. 1 is a perspective view showing a test piece used in an experiment for explaining the operation of the present invention.
【図２】対角線の交点からの距離と引張応力との関係を
示す特性図である。FIG. 2 is a characteristic diagram showing a relationship between a distance from an intersection of diagonal lines and a tensile stress.
【図３】対角線の交点からの距離と圧縮応力との関係を
示す特性図である。FIG. 3 is a characteristic diagram showing a relationship between a distance from an intersection of diagonal lines and a compressive stress.
【図４】本発明の実施例に用いた試験片を示す斜視図で
ある。FIG. 4 is a perspective view showing a test piece used in an example of the present invention.
【図５】本発明の実施例に用いた試験片を示すもので、
（Ａ）は試験片の表面を示す平面図、（Ｂ）は試験片の
裏面を示す平面図である。FIG. 5 shows a test piece used in an example of the present invention.
(A) is a plan view showing the front surface of the test piece, and (B) is a plan view showing the back surface of the test piece.
１ 試験片 ２ 表面 ３ 対角線（第１対角線） ４ 裏面 ５ 対角線（第２対角線） Ａ1 支点距離（距離Ａ） Ｂ1 支点距離（距離Ｂ） Ｐ1 第１支点 Ｐ2 第２支点Reference Signs List 1 test piece 2 front surface 3 diagonal line (first diagonal line) 4 back surface 5 diagonal line (second diagonal line) A 1 fulcrum distance (distance A) B 1 fulcrum distance (distance B) P 1 first fulcrum P 2 second fulcrum
Claims (3)
軸応力下における強度試験方法であって、 前記試験片の表面の第１対角線の両端から前記第１対角
線に沿って内側にそれぞれ等距離Ａだけ離れた位置に第
１支点を配置し、 前記試験片の裏面の第２対角線の両端から前記第２対角
線に沿って内側にそれぞれ等距離Ｂだけ離れた位置に第
２支点を配置し、 前記第１支点と前記第２支点とに荷重を加えることを特
徴とする二軸応力下における強度試験方法。1. A strength test method under a biaxial stress using an equilateral quadrangular plate-shaped test piece, wherein each of the test pieces has an inner surface along the first diagonal line from both ends of the first diagonal line on the surface of the test piece. A first fulcrum is arranged at a position separated by a distance A, and a second fulcrum is arranged at a position separated by an equal distance B inside both ends of a second diagonal line on the back surface of the test piece along the second diagonal line. A strength test method under biaxial stress, wherein a load is applied to the first fulcrum and the second fulcrum.
用いることを特徴とする請求項１記載の二軸応力下にお
ける強度試験方法。2. The strength test method under biaxial stress according to claim 1, wherein a square plate-shaped test piece is used as the test piece.
までの距離Ａと、前記試験片の一辺の長さと厚さとの積
Ｃとの比を１２０／１．４≦Ｃ／Ａ≦１２０／１．２と
し、かつ、 前記第２対角線の一端から前記第２支点までの距離Ｂ
と、前記試験片の一辺の長さと厚さとの積Ｃとの比を１
２０／１．４≦Ｃ／Ｂ≦１２０／１．２としたことを特
徴する請求項２記載の二軸応力下における強度試験方
法。3. A ratio of a distance A from one end of the first diagonal line to the first fulcrum and a product C of a length and a thickness of one side of the test piece is 120 / 1.4 ≦ C / A ≦ 120. /1.2, and the distance B from one end of the second diagonal to the second fulcrum
And the ratio of the product C of the length and thickness of one side of the test piece to 1
The strength test method under biaxial stress according to claim 2, wherein 20 / 1.4≤C / B≤120 / 1.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4064000A JP2769262B2 (en) | 1992-03-19 | 1992-03-19 | Strength test method under biaxial stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4064000A JP2769262B2 (en) | 1992-03-19 | 1992-03-19 | Strength test method under biaxial stress |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05264422A JPH05264422A (en) | 1993-10-12 |
| JP2769262B2 true JP2769262B2 (en) | 1998-06-25 |
Family
ID=13245508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4064000A Expired - Fee Related JP2769262B2 (en) | 1992-03-19 | 1992-03-19 | Strength test method under biaxial stress |
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| Country | Link |
|---|---|
| JP (1) | JP2769262B2 (en) |
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|---|---|---|---|---|
| JP6003479B2 (en) * | 2012-09-28 | 2016-10-05 | 株式会社Ihi | Biaxial four-point bending test equipment |
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1992
- 1992-03-19 JP JP4064000A patent/JP2769262B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05264422A (en) | 1993-10-12 |
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