Numerical and Experimental Investigations on the Service Life Estimation for Hot-Forging Dies
Numerical and Experimental Investigations on the Service Life Estimation for Hot-Forging Dies
复制标题
热锻模具使用寿命估算的数值和实验研究
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Andreas Klassen
中科院分区：
文献类型：
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作者：
B. Behrens;A. Bouguecha;T. Hadifi;Andreas Klassen
热锻模在使用过程中暴露在循环热机械、摩擦和化学载荷的组合中。除了模具表面的磨料和黏着磨损外，疲劳裂纹的萌生和随后的断裂是最常见的失效原因之一。为了延长刀具寿命，有限元方法可以作为工艺设计和工艺优化的一种手段。到目前为止，基于FEM的生产周期估计直到初始开裂是有限的，因为重复加载导致的工具材料行为没有以所需的精度捕获。能够考虑循环效应的材料模型在锻模疲劳寿命预测中没有得到验证。此外，有关热作钢的应变控制疲劳试验的疲劳特性到目前为止还无法提供接近现实的疲劳寿命预测。在工业锻造过程中，观察到明显的疲劳裂纹萌生，考虑进行疲劳分析。为此，用弹塑性材料行为对相关工具部件进行建模。的predi
Hot forging dies are exposed during service to a combination of cyclic thermo-mechanical, tribological and chemical loads. Besides abrasive and adhesive wear on the die surface, fatigue crack initiation with subsequent fracture is one of the most frequent causes of failure. In order to extend the tool life, the finite element method (FEM) may serve as a means for process design and process optimisation. So far the FEM based estimation of the production cycles until initial cracking is limited as tool material behaviour due to repeated loading is not captured with the required accuracy. Material models which are able to account for cyclic effects are not verified for the fatigue life predictions of forging dies. Furthermore fatigue properties from strain controlled fatigue tests of relevant hot work steels are to date not available to allow for a close-to-reality fatigue life prediction. An industrial forging process, where clear fatigue crack initiation has been observed is considered for a fatigue analysis. For this purpose the relevant tool component is modelled with elasto-plastic material behaviour. The predi