确定实际极限载荷的零曲率准则  

A ZERO-CURVATURE CRITERION TO DETERMINE THE PRACTICAL COLLAPSE LOAD

作　　者：章为民[1] 陆明万[1] 张如一[1] 

机构地区：[1]清华大学

出　　处：《固体力学学报》1989年第2期152-160,共9页Chinese Journal of Solid Mechanics

基　　金：自然科学基金;全国压力容器标准化技术委员会;自然科学基金;兰州石油化工机器厂的资助

摘　　要：本文提出一种确定实际极限载荷的零曲率准则.做了六个球壳—接管钢制模型试验.利用这些试验结果和取自其它文献的试验数据对新准则和已被提出的各种准则进行了比较、讨论.结果表明:(1)零曲率点是实验曲线上的一个特征点,新准则是一种不含任意人为系数的客观准则.(2)用新准则确定的极限载荷的分散性比其他准则为小.A zero-curvature criterion is proposed to determine the practical collapse load. Six tests have been carried out on spherical pressure vessels with cylindrical nozzle. Results of these tests and other experimental data quoted from different references are discussed in order to compare the new criterion with various previously proposed criteria. It is concluded that:(1)the zero-curvature point is a characteristic point of the experimental curve and that the new criterion is an objective criterion without any artificial coefficient. (2)the deviation of the collapse load estimated by the new criterion is smaller than that estimated by other criteria.

关 键 词：载荷 零曲率 塑性 

分 类 号：O344.5[理学—固体力学]