厚壁筒循环蠕变问题的有限元法

The Finite Element Method for Circular Creep of Thick - Wall Cylinder

对厚壁筒发生循环蠕变进行分析计算,推导出基于BFGS法的有限元计算式,采用ADINA计算程序,计算厚壁筒在循环蠕变下的等效应力.结果表明,BFGS法比N—R法有着更好的数值稳定性及收敛性.

The paper analyses the problem on circular creep of thick - wall cylinder, and the recurrence formular of the nonlinear finite element method based on the BFGS method is given, Further more, adopting the ADINA program, the equivalent stress of the thick - wall cylinder is calculated out, which proves a better convergence and numerical stability of BFGS method than that of N - R method.