摘要
研究20钢柱壳在较低爆炸载荷作用下的膨胀断裂特性,探讨拉伸断裂起始及拉-剪混合断裂机理。回收碎片宏观及微观分析结果显示:20钢柱壳在较低爆炸压力作用碎裂为拉剪-混合断裂,但与传统认为裂纹一般从柱壳外表面起始不同,断裂裂纹起始于柱壳壁厚内部,随膨胀变形发展向内、外表面扩展,形成拉-剪混合断裂。实验结果很好解释了许多金属柱壳爆炸实验中柱壳外表面出现裂纹的时间早于爆轰产物泄漏时间与动态有限元变形分析中外表面应力、应变始终处于较小状态之间的矛盾。
The experiments of expansion deformation and fracture characteristics of 20 steel cylindrical shells under low explosive load were carried out. The initiation of tensile-fracture and tensile-shear mixed fracture mode were discussed and the recovered fragments were analyzed by means of macroscopic and microscopic examination. The experimental results show that the failure of fragmentation for 20 steel cylindrical shells presents a mixed tensile-shear mode at a lower explosion pressure,but fracture cracks originate at the inner wall of the cylindrical shell,which is different from the general view that cracks initiate from outer surface of the cylindrical shells. Then the cracks extend to outer surfaces along radial direction and to the inner in shear direction with the expansion of the cylindrical shell. The experimental results well explain the contradictions that the time of cracks appear on outer surface of cylindrical shells is earlier than the time of detonation product leakage,and the outer surface stress or strain is always in a lower state in the dynamic finite element deformation analysis.
作者
郑柯
董新龙
ZHENG Ke;DONG Xinlong(Faculty of Mechanical Engineering & Mechanics, Ningbo University, Ningbo 315211, China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2018年第3期61-64,共4页
Ordnance Material Science and Engineering
基金
国家自然科学基金(11672143)
NSAF联合基金(U1230122)
关键词
柱壳
爆炸碎裂
拉剪断裂
微观分析
机理
cylindrical shells
explosive fragmentation
tensile-shear fracture
microscopic analysis
mechanism