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塑性变形体的边界接触应力分布规律的研究,涉及应力应变分布、变形力计算、模具强度设计等问题,但是用理论方法难以求解,本文用云纹法测定塑性变形体的接触应力,较其他方法简便而有效,在国内尚属首次。本文采用两种方法测定接触表面的应力分布: 第一种是用贴有密栅版的有机玻璃压块作“莫尔弹性元件”,使与之接触的铅试件塑性变形,并用云纹法测量有机玻璃压块(或金属压块)边界的接触应力分布。第二种是用光电扫描云纹法与塑性理论结合,直接测量和计算出边界接触应力和内部的应力、变形分布。第一种方法较简单,第二第方法则更具有普遍应用的意义。实验表明,云纹法是一种测定表面接触应力、摩擦系数和内部应力、变形分布的简便而有效的方法。实验结果达到工程应用的精度要求。
Plastic deformation of the boundary contact stress distribution law, involving the distribution of stress and strain, deformation force calculation, mold strength design and other issues, but the theoretical method is difficult to solve, in this paper, the moire method to determine the plastic deformation of the contact stress, compared with other methods Simple and effective, is the first time in China. In this paper, two methods were used to measure the stress distribution on the contact surface. The first method was to use the plexiglass block pressed with a mimetic plate as the “Moiré elastic element” to plasticize the lead specimen in contact with it. Measure the contact stress distribution at the boundary of the plexiglass briquette (or metal briquette). The second is the combination of optoelectronic scanning moire and plastic theory to directly measure and calculate the boundary contact stress and the internal stress and deformation distribution. The first method is simpler and the second one is more universal. Experiments show that the moire method is a simple and effective method to determine the surface contact stress, friction coefficient and internal stress and deformation distribution. The experimental results to meet the accuracy requirements of engineering applications.