Measurement of true stress yield ratio of x80 pipeline steel and its influence on the safety of the pipeline 80管线钢真实应力屈强比的测定及对管线安全性的影响
Based on the elastic michanics and plastic michanics , using the finit element analyses , the nonlinear finit element model of the beam - to - column is established in which the dynamic hardening and lardge deforamation are taken into account . the response of beam - to - column connections under cyclic load is researched on . after comparing between the finite element analyses and the experimental result through which the fem is verifid , three series of welded joins under cyclic load are computed 本文首先将有限元分析结果与现有试验结果对比,验证了分析方法的正确性,然后对三个系列的焊接梁柱连接在循环荷载作用下进行了计算分析,比较了全焊连接与栓焊混合连接的性能,研究了钢材屈服强度、屈强比、焊接孔形状及大小对全焊梁柱连接的影响,提出了梁柱连接设计建议。
To generalize the eccentricity ratio effect on ultimate tensile strength of ductile plates , the elesto - plastic finite element method is undertaken and a mathematical transition expression of normalized ultimate tensile strength of center - cracked , eccentrically cracked , edge - cracked plates is accordingly deduced 对于偏心裂纹延性板,采用弹塑性有限元进行了大量的组合计算,分析了相对裂纹长度、材料屈强比和裂纹偏心度对板的拉伸极限强度的影响,并给出了方便计算的回归公式。