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首页> 外文期刊>塑性と加工 >Simulation System Based on New Constitutive Equation Incorporating Stress Increment Dependence on the Direction of Strain Increment for Estimation of Sheet Metal Formability
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Simulation System Based on New Constitutive Equation Incorporating Stress Increment Dependence on the Direction of Strain Increment for Estimation of Sheet Metal Formability

机译：基于新的构成方程的仿真系统，其应力增量依赖性对应力增量依赖性的应变增量方向估计金属板材成形性

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摘要

The J_2-flow rule is commonly used in FEM software for sheet forming processes. However, it is known that the J_2-flow rule is not suitable for predicting the phenomenon of plastic instability, for example, fractures and wrinkles. Thus in this paper, a new constitutive equation incorporating stress increment dependence on the direction of strain increment is introduced into FEM software for sheet metal forming, and the effect of this constitutive equation on analytical results is investigated. In a stretching test with hemispherical punch, localized strain distribution before fracture is affected by the parameter Kc of the constitutive equation. The practical use of measuring Kc is proposed from a simplified stretching test. Finally, analytical results for maximum major strain are compared with experimental results; it is clarified that a new FEM program applying this constitutive equation enables prediction of the fracture more accurately than the J_2-flow rule.
机译：J_2-Flow规则通常用于FEM软件，用于表格过程。 然而，众所周知，J_2-流量规则不适用于预测塑料不稳定性的现象，例如裂缝和皱纹。 因此，在本文中，将应力增量依赖性的新的本构体方程引入了用于金属板形成的有限元软件，并且研究了该本构体方程对分析结果的影响。 在具有半球形冲头的拉伸试验中，裂缝前的局部应变分布受到本构式方程的参数Kc的影响。 测量KC的实际用途是从简化的拉伸试验中进行的。 最后，将最大主要应变的分析结果与实验结果进行比较; 阐明了应用该本构体方程的新有限元程序使得能够比J_2-Flow规则更准确地预测骨折。

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