30408奥氏体不锈钢弹塑性力学演变研究

Investigation on Elastoplastic Mechanical Evolutionof 30408Austenitic StainlessSteel

采用小冲杆测试技术测试30408奥氏体不锈钢的屈服强度及抗拉强度分别为195.43MPa、804.34MPa,运用扩展有限元的方法模拟了小冲杆试验的破裂过程,并基于弹塑性力学分析了某煤矿应力计压力枕的弹塑性变形。结果表明:采用扩展有限元法模拟小试样破裂位置与试验破裂位置基本吻合,断裂位置先经历减薄,减薄区发生最大的塑性变形为123.1%,之后随着应力的增大,试件产生破裂。压力枕的弹塑性分析与试验结果的相对误差在(0.21~6.65)%之内,表明该方法用于应力计压力枕的设计是可行的。这里指在探索大塑性变形零部件的精细化设计问题,减少试验次数,提高设计精度。

The yield strength and tensile strength of 30408 austenitic stainless steel were tested using the small plunger test technology to be 195.43MPa and 804.34MPa respectively.The rupture process of the small plunger test was simulated by the extended finite element method,and based on elastoplastic mechanics,the elastoplastic deformation of the pressure pillow of a coal mine stress gauge is analyzed.The results show that the rupture position of the small sample simulated by the extended finite element method is basically consistent with the test rupture position.The fracture position first undergoes thinning,and the largest plastic deformation in the thinned area is 123.1%.Then,as the stress increases,the specimen produce rupture.The relative error between the elasto-plastic analysis of the pressure pillow and the test results is within(0.21~6.65)%,which indicates that the method is feasible for the design of the stress gauge pressure pillow.lt aims to explore the fine design of parts with large plastic deformation,reduce the number of tests,and improve the design accuracy.