单个弹丸撞击316L不锈钢引起的变形场

发布时间：2018-03-25 03:30

本文选题：固体力学　切入点：变形场　出处：《爆炸与冲击》2017年01期

【摘要】：运用金属材料表面纳米化试验机对单个弹丸撞击316L不锈钢表面进行了撞击实验;采用激光共聚焦显微镜观察了弹坑的三维形貌,测量不同振动频率下弹坑的直径及离面位移;采用云纹干涉法对弹坑周围的面内应变场进行测量,并分析振动频率及撞击方式对弹坑尺寸、塑性应变大小以及塑性应变区范围的影响;采用有限元方法对单个弹丸垂直撞击试件表面的应变场进行数值模拟,与实验结果进行比较,分析了弹坑周围残余应力的分布。结果表明:随振动频率的增加,弹坑直径和离面位移都增加,频率在50~55 Hz,弹坑直径有突变,离面位移和振动频率呈线性关系;振动频率越大,塑性应变越大,塑性应变分布范围均大于弹坑直径的2倍;同一振动频率下弹丸垂直撞击比倾斜撞击的塑性应变大,而塑性应变分布范围相差不大;面内残余应变场的数值模拟结果和实验结果吻合较好,最大误差小于10%。
[Abstract]:The impact experiments of single projectile on the surface of 316L stainless steel were carried out by using a metal surface nanocrystalline test machine, the three-dimensional morphology of the crater was observed by laser confocal microscope, the diameter and off-plane displacement of the crater were measured under different vibration frequencies. The in-plane strain field around the crater is measured by moire interferometry, and the effects of vibration frequency and impact mode on the crater size, plastic strain and the range of plastic strain region are analyzed. The finite element method is used to simulate the strain field on the surface of a single projectile perpendicular to the specimen. Compared with the experimental results, the distribution of residual stress around the crater is analyzed. The results show that the strain field increases with the increase of vibration frequency. The crater diameter and off-plane displacement increase, the frequency is 50 ~ 55 Hz, the crater diameter is abrupt, the off-plane displacement and vibration frequency are linearly related, the larger the vibration frequency, the larger the plastic strain, and the larger the plastic strain distribution range is than 2 times of the crater diameter. At the same vibration frequency, the plastic strain of the projectile is larger than that of the oblique impact, and the distribution range of the plastic strain is not different, and the numerical simulation results of the in-plane residual strain field are in good agreement with the experimental results, and the maximum error is less than 10.
【作者单位】：内蒙古工业大学理学院;内蒙古工业大学土木工程学院;
【基金】：国家自然科学基金项目(11162011,11562016) 教育部高等学校博士学科点专项科研基金项目(20121514130001) 内蒙古自然科学基金项目(2013MS0107) 内蒙古工业大学基金项目(x201415)
【分类号】：TG142.71

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