超声滚压三维残余应力场的有限元模拟

发布时间：2018-06-01 21:21

本文选题：超声滚压 + 有限元分析　；参考：《机械强度》2017年04期

【摘要】：探讨一种研究超声滚压表层残余应力的数值方法。超声滚压过程是一个强烈的塑性变形过程,涉及到复杂的静态和动态冲击挤压。根据该加工技术的原理建立了有限元模型,评估了网格参数、定义了加载方式,并通过304不锈钢圆盘的超声滚压实验对有限元模型进行验证,在此基础上,模拟了超声滚压的加工过程,分析了残余应力分布特点以及各加工参数对其影响规律。结果表明:超声滚压后,材料表面产生了分布均匀的残余压应力,随着深度的增加,残余应力先后出现一次压应力峰值和较小的拉应力峰值最后降低为0。加工参数对残余应力的幅值和深度影响程度不同,静压力、覆盖率和加工次数影响较大,振幅影响较小。
[Abstract]:A numerical method for studying the residual stress in the surface of ultrasonic rolling is discussed. The ultrasonic rolling process is a strong plastic deformation process, involving complex static and dynamic impact extrusion. A finite element model is established based on the principle of the processing technology. The parameters of the mesh are evaluated, the loading method is defined, and the over 304 stainless steel disc is over. The finite element model is verified by the sound rolling experiment. On this basis, the processing process of ultrasonic rolling is simulated. The distribution characteristics of residual stress and the influence of each processing parameter are analyzed. The results show that the surface of the material has a uniform distribution of residual compressive stress after ultrasonic rolling, and the residual stress appears successively with the increase of depth. The peak stress peak and the smaller tensile stress peak finally decrease to 0. processing parameters, which have different influence on the amplitude and depth of residual stress, the static pressure, the coverage rate and the number of processing times are greatly influenced, and the effect of the amplitude is smaller.
【作者单位】：江西理工大学机电工程学院;
【基金】：国家自然科学基金项目(51565017) 江西省教育厅科技计划项目(GJJ14424)资助~~
【分类号】：TG306;TG663

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