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首页> 外文期刊>Journal of Materials Processing Technology >Modelling of multiple impacts for the prediction of distortions and residual stresses induced by ultrasonic shot peening (USP)
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Modelling of multiple impacts for the prediction of distortions and residual stresses induced by ultrasonic shot peening (USP)

机译：多种冲击建模，以预测超声波喷丸（USP）引起的变形和残余应力

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摘要

During a manufacturing process, the ultrasonic shot peening (USP) technique can be used as the final surface treatment. The aim of this operation is to introduce surface compressive residual stresses in order to prevent crack propagation advancement. Although the numerical simulation method is able to predict the level of residual stresses in a peened part, the 3D modelling of the real USP process, in which many successive and shifted impacts take place, is very delicate to perform and costly in terms of computing time and memory space required. In this paper, a two step method based at first on the calculation of the averaged plastic strain tensor in a half-space by using a semi-analytical method and in a second time on the transfer of this plastic strain field to a finite element model is proposed in order to simulate the effects of the USP process in thin structures. The accuracy and advantages of the semi-analytical method are validated by a benchmark with several finite element codes. Experiments, similar to the Almen test, are performed on thin plates of Inconel 600. Numerical results in terms of distortions and residual stresses are compared with the experimental data.
机译：在制造过程中，超声波喷丸（USP）技术可用作最终的表面处理。该操作的目的是引入表面压缩残余应力，以防止裂纹扩展。尽管数值模拟方法可以预测锤击零件中的残余应力水平，但实际的USP过程的3D建模（其中会发生许多连续的和转移的影响）执行起来非常精细，并且在计算时间方面成本很高和所需的存储空间。本文采用两步法，首先基于使用半解析法计算半空间中的平均塑性应变张量，然后基于此塑性应变场向有限元模型的转换。为了模拟USP工艺在薄结构中的作用，提出了“表面活性剂”。半分析方法的准确性和优势已通过带有多个有限元代码的基准进行了验证。在Inconel 600的薄板上进行类似于Almen测试的实验。将变形和残余应力方面的数值结果与实验数据进行了比较。

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