几何非线性效应对接管高应变区力学特性的影响

INFLUENCES ON MECHANICS CHARACTERS OF HIGH STRAINREGION IN NOZZLES OF GEOMETRIC NONLINEAR EFFECT

通过运用三维大应变弹塑性有限元程序计算了接管高应变区应力集中系数及鼓胀变形，分析了几何非线性对接管高应变区力学特性的影响，同时对一台相同尺寸的实物容器进行实验验证。结果表明，接管高应变区的几何非线性效应十分明显，它较好地反映该区域的受力特性和变形情况。

This paper analyzes the influences of geometric nonlinear effect on mechanics characters of high strain region in nozzles through calculating this area′s stress intensity factor and displacement by using 3 D large strain elastic plastic finite element program.Meanwhile,a real pressure vessel with the same size has been tested and verified.The results show that the influences of geometric nonlinear effect on high strain region in nozzles are very obvious,it reflects the stress characters and displacement circumstances of the area well.