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Ductile damage model for metal forming simulations including refined description of void nucleation

机译:用于金属成形模拟的韧性损伤模型,包括精炼模型   空洞成核的描述

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摘要

We address the prediction of ductile damage and material anisotropyaccumulated during plastic deformation of metals. A new model ofphenomenological metal plasticity is proposed which is suitable forapplications involving large deformations of workpiece material. The modeltakes combined nonlinear isotropic/kinematic hardening, strain-driven damageand rate-dependence of the stress response into account. Within this model, thework hardening and the damage evolution are fully coupled. The description ofthe kinematics is based on the double multiplicative decomposition of thedeformation gradient proposed by Lion. An additional multiplicativedecomposition is introduced in order to account for the damage-induced volumeincrease of the material. The model is formulated in a thermodynamicallyadmissible manner. Within a simple example of the proposed framework, thematerial porosity is adopted as a rough measure of damage. A new simple void nucleation rule is formulated based on the consideration ofvarious nucleation mechanisms. In particular, this rule is suitable formaterials which exhibit a higher void nucleation rate under torsion than incase of tension. The material model is implemented into the FEM code Abaqus and a simulationof a deep drawing process is presented. The robustness of the algorithm and theperformance of the formulation is demonstrated.
机译:我们解决了金属塑性变形过程中延性破坏和材料各向异性积累的预测问题。提出了一种新的现象学金属塑性模型,该模型适用于涉及工件材料大变形的应用。该模型综合考虑了非线性各向同性/运动学硬化,应变驱动损伤和应力响应的速率相关性。在此模型中,工作硬化与损伤演化完全耦合。运动学的描述是基于Lion提出的变形梯度的二次乘法分解。为了解决材料引起的损伤引起的体积增加,引入了附加的乘法分解。该模型以热力学上允许的方式制定。在所提出框架的一个简单示例中,材料孔隙率被用作损伤的粗略度量。在考虑各种成核机理的基础上,提出了一种新的简单的空核形化规则。特别是,该规则适用于在扭转情况下比在张力情况下具有更高的空核率的材料。材料模型被实现为FEM代码Abaqus,并给出了深冲过程的仿真。证明了算法的鲁棒性和公式的性能。

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