Two alternative formulations of single crystal plasticity model were introduced respectively and two schemes were implemented in the explicit FE code with software ABAQUS/Explicit by writing the user subroutine *** co...
详细信息
Two alternative formulations of single crystal plasticity model were introduced respectively and two schemes were implemented in the explicit FE code with software ABAQUS/Explicit by writing the user subroutine *** containing material data were created with solid *** element represented an individual grain,and the grain orientations were explicitly stored and updated at each *** modulus method was employed to calculate the plastic shear strain increment of deformation systems in combination with a hardening law to describe the hardening *** two developed subroutines were applied to simulate the texture evolution during the uniaxial tension of copper（FCC）,cold rolling of IF steel（BCC） and uniaxial compression of AZ31 magnesium alloy（HCP）.The predicted texture distributions are in qualitative agreement with the experimental results.
多工序加工系统中最终产品的尺寸误差是所有加工工序上尺寸误差累积、耦合与传递的结果。目前方法是建立数学模型对多工序加工系统尺寸误差传递进行分析,而缺乏逻辑层次上的建模理论和方法。为解决多工序加工系统中尺寸误差传递的逻辑分析问题,采用面向对象Petri网方法,在定义误差状态通用物理对象基础上,建立通用物理对象和加工系统的映射规则,对误差状态子类物理对象进行继承和封装,设计出误差状态消息传递关系网。建立的产品尺寸误差面向对象Petri网(Errors of product dimension-object oriented Petri net,EPD-OPN)模型可以作为多工序加工系统中尺寸误差传递动态分析和故障诊断依据。通过发动机缸盖的多工序加工过程为例证明该模型的有效性和可行性。该模型具有模块化、可重复使用性的特点和结构化的复杂逻辑关系描述能力,是目前数学模型很好的扩展。
暂无评论