Photoelastic studies of three‐dimensional stress field caused by a cylindrical punch
Photoelastic studies of three‐dimensional stress field caused by a cylindrical punch
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圆柱冲头三维应力场的光弹性研究
DOI：
10.1063/1.328044
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发表时间：
1980
影响因子：
3.2
通讯作者：
J. C. Li
中科院分区：
文献类型：
--
作者：
S. Chu;J. C. Li
应力冻结技术用于观察由同轴加载的圆柱形冲头产生的圆柱体内部的应力分布。冲头的平端压在垂直圆柱体的顶面上。应力冻结后，制备一个垂直直径的薄切片用于光弹性观察。将应力分布与使用以下两种边界条件计算的半无限体的理论结果进行比较：冲头的均匀位移和冲头下的均匀压力。协议是好的，在长距离（三倍冲头半径）与任何边界条件。在短距离处，观察到的应力分布介于两者之间，但接近于均匀位移边界条件。这些结果支持在先前的蠕变速度有限元计算中使用冲头下的混合应力分布。
A stress‐freezing technique is used to observe the stress distribution inside a cylindrical body produced by a coaxially loaded cylindrical punch. The flat end of the punch is pressed against the top surface of a vertical cylinder. After the stress is frozen in, a thin vertical diametric slice is prepared for photoelastic observation. The stress distribution is compared with theoretical results calculated for a semi‐infinite body using the following two boundary conditions: uniform displacement of the punch and uniform pressure under the punch. The agreement is good at long distances (three times the punch radius) with either boundary condition. At short distances, the observed stress distribution is in between but close to the uniform displacement boundary condition. These results support the use of mixed stress distributions under the punch in a previous finite‐element calculation of impressing creep velocities.