Elastic and Plastic Stress Analysis of Bolt Threads

• Main Authors: Cheng-Ying Chang, 張正穎
• Other Authors: Chih-I Chu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/36w997

碩士 === 逢甲大學 === 機械工程學所 === 100 === In structural design, thread is a very critical issue that can never be ignored. This thesis uses a nonlinear finite element method to study the stress distribution of the thread under different fillet radius, depth, structu- re and plastic deformation. The analysis showed that the depth is not changed, increase the root fillet radius can reduce stress concentration of the thread root. In depth change, increase fillet radius will also make the thread root stress decrease, but when the fillet is too large, lead to roots become sharp, it will make the thread root stress increase. Under the plastic deformation, when the first thread of load too large to reach the yield, remaining load will be spread to the second thread, the second thread immediately yield, it will make each thread of the stress tends to average. In addition, change nut structures and parameters of different dimension, study the effect of different dimensions of stress in bolt thread