Research on Dynamic Behavior and a Failure-Model for GH4133B Superalloy
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摘要: 根据典型航空发动机机匣常用高温合金GH4133B在不同温度(298~1 073 K)、不同应变率(10-1~5×103s-1)下的力学性能试验结果,结合机匣包容性分析用的J-C(Johnson-Cook)本构模型在实际应用中本身存在的不足,提出了一种更为准确地描述GH4133B合金力学行为的修正J-C本构模型(modified J-C model,MJC model),同时结合GH4133B在不同温度、不同应力三轴度的破坏行为,建立了基于J-C时效判据的一个经验型的失效模型.通过模型预测结果与试验结果对比,发现所建立的本构模型和失效模型能很好地预测GH4133B塑性流动应力及破坏行为.Abstract: According to the experimental results of dynamic properties of typical aero-engine casing material GH4133B at different temperatures (298~1 073K) and strain rates (10-1~5×103s-1), and in view of intrinsic defects of the J-C model used in the analysis of casing acceptance in engineering applications, a more accurate revised J-C model was proposed to describe the mechanical behavior of GH4133B superalloy. In the meantime, an empirical failure model based on the J-C model was obtained based on test results of material stress triaxiality. Comparison between the model predictions and the experimental results shows that, the established constitutive model and the failure model well predict the plastic flow stress and the failure behavior of GH4133B.
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Key words:
- aero-engine /
- GH4133B /
- dynamic /
- mechanical behavior
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