Crack growth in plastic panels under biaxial stress
Crack growth in plastic panels under biaxial stress
复制标题
双轴应力下塑料板的裂纹扩展
DOI：
10.1016/0032-3861(76)90282-2
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发表时间：
1976
期刊：
影响因子：
4.6
通讯作者：
L. E. Culver
中科院分区：
文献类型：
--
作者：
P. Leevers;J. Radon;L. E. Culver
断裂力学的理论家和实践者通常认为，裂纹的行为仅取决于在其尖端引起应力奇异性的载荷。然而，越来越多的证据表明，这可能并不完全如此，平行于裂纹的应力会影响断裂韧性和循环传播速率。对这些效应进行更广泛的研究涉及实验困难。本文中描述的测试设备以简单的方式提供了这些问题的解决方案，而不会显著牺牲实验精度。聚（甲基丙烯酸甲酯）的初步测试，以证明机器本身和现象，它被用来调查;结果表明，至少对于这种材料，横向应力的影响确实是轻微的。
It is commonly considered by theoreticians and practitioners of fracture mechanics that the behaviour of a crack is determined only by loads causing a stress singularity at its tip. However, evidence is accumulating which indicates that this may not be entirely so, and that stresses parallel to the crack can affect fracture toughness and cyclic propagation rates. More extensive investigation of these effects involves experimental difficulties. Testing equipment described in this article offers the solution of these problems in a simple way without any significant sacrifice in experimental accuracy. Preliminary tests on poly(methyl methacrylate) are described to demonstrate the machine itself and the phenomena which it is being used to investigate; the results suggest that, for this material at least, the effects of transverse stresses are indeed slight.