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Elasto-Plastic Stress Analysis Methodology Establishment for Forging Dies

机译：锻模弹塑性应力分析方法的建立

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Finite Element Analysis (FEA) is an important engineering tool used to assist in approximating and verifying how a component will react under various complex loading conditions. There are many conditions where the stress applied could extend beyond the yield point of the material but FEA does not necessarily provide visual indication that the part has yielded. Elastic material property has a linear stress-strain relationship regardless of the load applied while the elastic-plastic has a linear relationship up to yield point and then becomes nonlinear beyond yield point.In this study tensile tests and finite element analysis were carried out on forging die material. The unidirectional monotonic tensile tests were carried out on MTS machine. The Hypermesh and ANSYS FEA tools are used for elastic and elastic-plastic FEA. The mechanical behavior and stresses at critical locations under realistic forging process loading condition is investigated based on elastic and elastic-plastic FEA. Specifically, the elastic-plastic response under forging loading conditions beyond the elastic limit is studied. The stress - strain of die material was determined and used as input of a nonlinear finite element study aimed at investigating the stress evolution in the forging die. The forging die elastic FEA was carried out based on basic material properties, while elastic-plastic FEA was carried out based on material nonlinearity Von misses isotropic hardening plasticity criteria. The study concludes that elastic- plastic FEA gives more accurate die stress value and critical locations.
机译：有限元分析（FEA）是一种重要的工程工具，用于协助近似和验证组件在各种复杂负载条件下的反应方式。在许多情况下，施加的应力可能会超出材料的屈服点，但FEA不一定能直观地表明零件已屈服。弹性材料的特性与施加的载荷无关，具有线性应力-应变关系，而弹性-塑性直至屈服点呈线性关系，然后超过屈服点变为非线性。在本研究中，对锻件进行了拉伸试验和有限元分析模具材料。在MTS机器上进行了单向单调拉伸试验。 Hypermesh和ANSYS FEA工具用于弹性和弹塑性FEA。基于弹性和弹塑性有限元分析，研究了在实际锻造过程中载荷条件下关键部位的力学行为和应力。具体地，研究了在超过弹性极限的锻造载荷条件下的弹塑性响应。确定了模具材料的应力-应变，并将其用作非线性有限元研究的输入，该研究旨在研究锻模中的应力变化。锻模的弹性有限元分析是基于基本的材料性能进行的，而弹塑性的有限元分析是基于材料的非线性进行的。研究得出的结论是，弹塑性有限元分析可提供更准确的模具应力值和关键位置。

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