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板料成形极限应力图研究
引用本文:谢英,万敏,韩非.板料成形极限应力图研究[J].机械工程学报,2005,41(7):45-49.
作者姓名:谢英  万敏  韩非
作者单位:北京航空航天大学机械工程及自动化学院,北京,100083
基金项目:国家自然科学基金(50475004) 华中科技大学模具技术重点实验室基金(02-5)资助项目
摘    要:基于塑性应力应变关系,推导出极限应力与极限应变相互转换关系,针对分散性失稳、凹槽失稳和平面应变漂移失稳等准则,进行了双线性应变路径、曲线戍变路径和复合应变路径下成形极限应力图的理论计算。结果表明,成形极限应力图不受应变路径影响,对于同一失稳准则,在不同加载应变路径下几乎为同一条曲线。因此,成形极限应力图作为复杂加载路径的成形极限判据更加方便和实用。

关 键 词:板料成形  成形极限图  成形极限应力图  应变路径
修稿时间:2004年1月9日

INVESTIGATION OF FORMING LIMIT STRESS DIAGRAMS OF SHEET METALS
Xie Ying,Wan Min,Han Fei.INVESTIGATION OF FORMING LIMIT STRESS DIAGRAMS OF SHEET METALS[J].Chinese Journal of Mechanical Engineering,2005,41(7):45-49.
Authors:Xie Ying  Wan Min  Han Fei
Abstract:Transformation between limit strain and limit stress is evolves on the basis of plastic relationship between strain and stress. Theoretic FLSDs (Forming limit stress diagrams) are calculated under linear strain path, curvilinear strain path and compounded strain path according to diffuse instability theory, groove instability theory and plane strain floating instability theory. The result shows that FLSD is independent of strain path, and that the FLSD under different strain paths are almost the same curve according to the same instability theory. So it's more convenient and practical to use FLSD as the criterion of forming limit.
Keywords:Sheet metal forming FLD(Forming limit diagram) FLSD (Forming limit stress diagram) Strain paths
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