|
摘要：
|
|
Hill在1952年首先提出板料拉伸失稳有分散性失稳(difluse necking)和集中性失稳(Localized necking)两种。他指出最大拉伸载荷(Swift失稳条件)时材料开始出现分散性失稳,然后才产生集中性失稳,并从理论上推算出出现集中性失稳的条件。在单向拉伸试验时,出现集中性失稳的时刻远比理论预示值要早。因此分散性失稳现象,往往容易被忽视,一般常袭用最大载荷的出现时刻称为细颈点。本文用理论分析和实验结果解释了单向拉伸失稳的机理说明了集中性失稳提前到来的原因。
|
|
|
|
基金项目：
|
|
|
|
作者简介：
|
|
|
|
参考文献：
|
1． Chen Hezheng & P.Dewhurst "An investigation of diffuse necking in simple tension" in manuscript. University of Salford
2． R. Hill, "on discontinuous plastic states, with special reference to localized necking in thin sheets" J. Mech. Phys. Solids 1952, V1, P19
3． H. W. Swift, "Plastic instability under plane stress" J. Mech Phys Solids 1952, V1 P 1
4． S. P. Keeler& W. A.Backo fen, "Plastic instability and fracture in sheets stretched over rigid punches" Trans. ASM 1963, V56, P25
5． A. Nadia, "Theory of flow fracture of solids" 1950, P319-321
6． R·希尔,“塑性数学理论”科学出版社 1966,P332-333
7． A. K. Ghosh, "The influcncc of strain hardening and strain-rate sensitivity on shect metal forming" Trans. ASME July,1977, P264
8． A.K.Ghosh, "Strain localizalion in the diffuse neck in shoet metal"Metallurgical Trans.A 1974, V5, P1607
|
|
服务与反馈：
|
|
【文章下载】【加入收藏】
|
|
|
|
