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首页> 外文期刊>Journal of Materials Engineering and Performance >Analytical Modeling of Strain Rate Distribution During Friction Stir Processing
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Analytical Modeling of Strain Rate Distribution During Friction Stir Processing

机译：搅拌摩擦过程中应变率分布的解析模型

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摘要

Friction Stir Processing (FSP) is becoming an acceptable technique for modifying the grain structure of sheet metals. One of the most important issues that hinder the widespread use of FSP is the lack of accurate models that can predict the resulting microstructure in terms of process parameters. Most of the work that has been done in the FSP field is experimental, and limited modeling activities have been conducted. In this work, an analytical model is presented that can predict the strain rate distribution and the deformation zone in the friction stir processed zone as a function of process parameters. In the model, the velocity fields within the processed zone are determined by incorporating the effects of both the shoulder and the pin of the tool on the material flow. This is achieved by introducing state variables and weight functions. The model also accounts for different interfacial conditions between the tool and the material. The effects of different process parameters and conditions on the velocity fields and strain rate distributions are discussed. The results clearly show that the model can successfully predict the shape of the deformation zone and that the predicted strain rate values are in good agreement with results reported in the literature.
机译：搅拌摩擦加工（FSP）正成为一种用于改变钣金晶粒结构的可接受技术。阻碍FSP广泛使用的最重要问题之一是缺乏能够根据工艺参数预测最终微观结构的精确模型。 FSP领域中完成的大多数工作都是实验性的，并且进行了有限的建模活动。在这项工作中，提出了一个分析模型，该模型可以预测摩擦搅拌加工区中的应变率分布和变形区与工艺参数的关系。在模型中，通过合并工具的肩部和销钉对物料流的影响来确定加工区域内的速度场。这可以通过引入状态变量和权重函数来实现。该模型还考虑了工具和材料之间的不同界面条件。讨论了不同工艺参数和条件对速度场和应变率分布的影响。结果清楚地表明，该模型可以成功地预测变形区的形状，并且所预测的应变率值与文献报道的结果高度吻合。

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