胡俊,廖凯,罗鹏博,李立君,陈飞

• 1:中南林业科技大学机电工程学院

摘要(Abstract)：

运用ANSYS动力学模块建立单弹坑、双弹坑交叠模型和三弹坑互交模型，分析材料表面在弹丸作用下的动态塑变过程和弹坑形变与应力场分布规律。鉴于实际弹坑无法直接测试，实验基于相似原则，放大弹丸和坑型尺度，通过X射线衍射(XRD)表面应力测试获得弹坑应力分布，将结果归一化处理后与喷丸仿真下弹坑应力分布规律进行对比。结果表明：相似性实验结果与仿真结果具有较好的一致性；单弹坑内呈压应力分布，应力大小与形变量直接相关，从坑沿到凹陷最深处，应力强度逐渐增大；1/4d(d为弹丸直径)偏置模型中，弹丸依次撞击靶材，弹坑重叠区域应力分布表现为新的塑性变形导致原有的弹坑受挤压而产生变形，进而使得原有弹坑的应力松弛了68.2%,因此整体上喷丸后弹坑应力分布状况随着重叠区和凹陷区呈现波纹状起伏。研究认为，弹丸重叠撞击起到均化材料表面应力的作用。

关键词(KeyWords)： 喷丸弹坑;铝合金;应力场;有限元模型;相似理论

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2022YFD2202103);; 国家自然科学基金(51475483)

作者(Author): 胡俊,廖凯,罗鹏博,李立君,陈飞

DOI: 10.13289/j.issn.1009-6264.2023-0137

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