爆炸与电磁加载下无氧铜环、柱壳的断裂模式转变

发布时间：2018-04-18 00:10

本文选题：颈缩 + 断裂　；参考：《爆炸与冲击》2017年06期

【摘要】：考虑断面收缩率、局域断裂应变以及平均断裂应变,并基于电磁膨胀环、爆炸膨胀环(柱壳)实验平台,研究了高纯无氧铜(TU1)环及柱壳在高应变率载荷下的膨胀断裂行为。采用高速摄影技术拍摄柱壳外壁的膨胀断裂形貌演化过程,用于确定柱壳平均断裂应变;利用激光干涉测速技术获得样品径向膨胀速度历史,用于确定加载应变率;利用样品的全回收测量及微观表征,确定了无氧铜环、柱壳的局域断裂应变及断裂模式。实验表明,随着应变率的增加,TU1材料的平均断裂应变增加,断面的收缩程度加剧,并在应变率约为1.0×10~4s~(-1)附近会出现明显的断裂模式转变,断面收缩率出现量级上的跳跃,从10~0变化至约10~3,局域断裂应变呈现明显的分区现象。
[Abstract]:Based on the experimental platform of electromagnetic expansion ring and explosive expansion ring (cylindrical shell), the expansion and fracture behavior of high purity oxygen free copper tu _ 1 ring and cylindrical shell under high strain rate loading were studied with the consideration of section shrinkage, local fracture strain and average fracture strain.The evolution process of expanding fracture morphology of the outer wall of cylindrical shell was recorded by high-speed photography, which was used to determine the average fracture strain of cylindrical shell, and the radial expansion velocity history of sample was obtained by laser interference velocimetry, which was used to determine the loading strain rate.The local fracture strain and fracture mode of oxygen free copper ring and cylindrical shell were determined by means of total recovery measurement and microscopic characterization of the samples.The experimental results show that with the increase of strain rate, the average fracture strain of TU1 material increases, the shrinkage degree of the section increases, and the fracture mode changes obviously near the strain rate of about 1.0 脳 10 ~ (4) s ~ (-1), and the shrinkage rate of the section jumps in order of magnitude.From 10 ~ 0 to about 10 ~ 3, the local fracture strain shows obvious zonation phenomenon.
【作者单位】：中国工程物理研究院流体物理研究所;
【基金】：国家自然科学基金项目(11172279)
【分类号】：O346.1;O38

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