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The fracture mechanics fatigue test manner null due to duplex decentering
The fracture mechanics fatigue test manner null due to duplex decentering
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机译：断裂力学疲劳试验方式由于双偏心而失效
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摘要
PURPOSE: To evaluate a crack propagation speed, etc., by using a stress enlarging coefficient value by applying a compression load to a testpiece which has a rectangular parallelepiped shape and in which a length is larger than a width and a precrack is formed at the center. ;CONSTITUTION: A compression load is applied to two crossing lines of a surface parallel to a testing section and an end face of a precrack side at an interval I=W/2+2e to be eccentrically deviated outside from a center of the testing section and both side faces by using a testpiece 1 in which a precrack 2 is formed. When a composite force balanced with the compression load is loaded with the compression load P at the other end face opposite to the precrack, a stress enlarging coefficient K1 occurs only in a mode one component at an end of the precrack on the testing section, and the crack can be propagated along it. A stable crack growing area in which sufficiently wide L-W in which a K value is decided only by the load irrespective of the length of the crack is obtained under a load control. When a hysteresis is measured and a compliance of its linear range is obtained, a crack propagation amount can be immediately obtained.;COPYRIGHT: (C)1994,JPO&Japio
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机译：目的：通过对具有长方体形状，长度大于宽度且预裂纹形成在预裂纹处的试件施加压缩载荷，使用应力增大系数值来评估裂纹扩展速度等。中央。 ;构成：压缩载荷以平行的方式施加到平行于测试段的表面和预裂纹侧面的端面的两条相交线上，间隔为I = W / 2 + 2e，从而从测试段的中心向外偏心通过使用其中形成有预裂纹2的测试件1和两个侧面。当在与预裂纹相反的另一端面上施加压缩负载P来平衡与压缩负载平衡的合力时，应力增大系数K1仅在测试部分的预裂纹端部的一个模态分量中出现，并且裂纹可以沿裂纹扩展。在载荷控制下，获得稳定的裂纹扩展区域，其中L-W足够宽，L-W的K值仅由载荷决定，而与裂纹的长度无关。当测量磁滞并获得其线性范围的顺应性时，可以立即获得裂纹扩展量。;版权所有：（C）1994，JPO＆Japio
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