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首页> 外文期刊>Journal of engineering materials and technology >Failure Strain and Fracture Prediction During Shock Tube Impact Forming of AA 5052-H32 Sheet
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Failure Strain and Fracture Prediction During Shock Tube Impact Forming of AA 5052-H32 Sheet

机译：AA 5052-H32薄片冲击管撞击形成期间的失效应变和断裂预测

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摘要

The present study deals with both numerical and experimental evaluation of failure strain and fracture pattern during shock tube impact forming of 1.5 mm thick AA 5052-H32 sheet. A hemispherical end nylon striker is propelled to deform the sheet at different velocities. Here, the main objective is to understand the effect of flow stress models and fracture models on the forming outputs. The experimental situation is modeled in two stages, i.e., incorporating the pressure in the first stage and displacement of the striker in the second stage in finite element simulation using the finite element (FE) code (DEF0RM-3D). A new strategy followed to evaluate the rate-dependent flow stress data from the tensile test of samples sectioned from shock tube-based deformed sheet is acceptable, and finite element simulations incorporating these properties predicted accurate failure strain and fracture pattern. Out of all the flow stress models, the modified Johnson-Cook model has a better flow stress predictability due to the inclusion of the non-linear strain rate sensitivity term in the model. During the prediction of the failure strain and necking location, the Cockcroft-Latham failure model, Brozzo failure model, and Freudenthal failure model have a fair agreement with experimental data in combination with the two flow stress models, i.e., Johnson-Cook model and modified Johnson-Cook model.
机译：本研究涉及失效应变和裂缝图案的数值和实验评估，在抗冲击管冲击成形为1.5mm厚的AA 5052-H32片材中。将半球形末端尼龙前锋推进以在不同的速度下变形片材。在这里，主要目的是了解流量应力模型和裂缝模型对成形输出的影响。实验情况以两个阶段建模，即，在使用有限元（Fe）代码（DEF0RM-3D）中的有限元模拟中的第二阶段中的第一阶段中的压力和撞击器的位移。遵循从受冲击管的变形片材切开的样品的拉伸试验评估速率依赖性流量压力数据的新策略是可接受的，并且具有这些特性的有限元模拟预测了准确的失效应变和断裂模式。除了流量应力模型中，改性的Johnson-Cook模型具有更好的流量应力可预测性，由于模型中的非线性应变速率灵敏度术语包含了更好的压力可预测性。在预测失败应变和颈颈位置，CockCroft-Latham失败模型，Brozzo失败模型和弗雷登哈尔失败模型与实验数据相结合，与两个流量应力模型，即Johnson-Cook模型和修改约翰逊厨师模型。

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