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MODELLING THE CRACK FORMATION IN CLOSED DIE COMPACTION OF HARD METAL POWDER

机译:硬金属粉末闭模压制中裂纹形成的建模

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摘要

In modeling of P/M compaction processes, there have been significant advances in the recent past, in predicting the density distributions quite close to real life situations. However, modeling of damage of the green during compaction or during ejection is an important issue that needs to be addressed in the modeling. In the present paper authors take the case of a benchmarking experimental work reported by the DIENET, the European Union Thematic Network on compaction modeling. The particular report is about the compaction of a hardmetal flanged bush and the resultant damage of the same at the end of compaction. In the present paper authors have simulated the hard metal compaction process using commercial FEM software DEFORM. Powder material constitutive equations, yield functions and the damage are modeled in FEM simulation procedure. The powder material constitutive relationship, yield condition, and damage are modeled in FEM. Results FEM modeling of the compaction process and the damage of the component is presented in this paper. The FEM results of compaction load and the damage match closely with the reported experimental results.
机译:在P / M压实过程的建模中,最近在预测密度分布非常接近现实生活情况方面取得了重大进展。但是,在压实或弹出过程中对生坯的损坏进行建模是一个重要的问题,需要在建模中解决。在本文中,作者以DIENET(欧盟压实建模主题网络)报告的基准实验工作为例。特别的报告是关于硬质金属法兰衬套的压实及其在压实结束时造成的损坏。在本文中,作者使用商用FEM软件DEFORM模拟了硬质金属的压实过程。在有限元模拟程序中对粉末材料的本构方程,屈服函数和损伤进行建模。用有限元法对粉末材料的本构关系,屈服条件和损伤进行建模。结果本文介绍了压实过程和零件损坏的有限元建模。压实载荷和损伤的有限元结果与报道的实验结果非常吻合。

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