粗晶超塑性单轴拉伸颈缩模拟  

Simulation of superplastic uniaxial tensile necking in coarse-grained materials

作　　者：吴艳青[1] 张克实[1] 

机构地区：[1]西北工业大学工程力学系,西安陕西710072

出　　处：《计算力学学报》2004年第1期81-87,共7页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(19972055)资助项目.

摘　　要：利用粘塑性本构模型模拟粗晶超塑性单轴拉伸。数值结果表明,颈缩的位置及发展过程受拉伸应变速率的影响。不只一处分散不均匀变形相互牵制与协调,使材料得以在接近均匀的状态下经受大的变形,模拟得到的局部应变速率演化曲线,可以预测变形局部化发展的情况。Numerical simulations were conducted on uniaxial tensions of the coarse|grained superplasticity using viscoplastic constitutive equations. Simulated results showed that the positions and the evolution processes of necks are influenced by tensile strain rates. Restrictions and accommodations between scattered localizations promote large uniform deformation. Localized deformation characteristics can be found by viewing the strain rate evolution for different positions.

关 键 词：粗晶超塑性 单轴拉伸 颈缩 粘塑性 本构模型 固体力学 柯西应力张量 载荷-位移曲线 应变速率 

分 类 号：O344.1[理学—固体力学]