摘要
利用电磁膨胀环技术对无氧铜环进行了不同加载电压下的动态拉伸实验。对无氧铜在破碎前出现塑性失稳——多重颈缩进行了初步分析,利用能量平衡的破碎理论给出了无氧铜环的破碎分布。三维数值模拟结果表明,颈缩区温升比非颈缩区高,且多重颈缩在环周上的分布服从泊松分布。
The dynamic tension experiments of OFHC Cu rings at different voltages were carried out by electromagnetically driven expansion techniques. The plastic instability, i.e. multiple necking fracture before the fragmentation was fundamentally analyzed, and the fragments distribution was obtained from the energy balance theory. The 3-D numerical simulation shows that the temperature rise of necking region is higher than that of no-necking region. The multiple necking fracture distribution on the circumference yields to random Poisson distribution.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2007年第1期40-44,共5页
Explosion and Shock Waves
基金
中国工程物理研究院科学技术基金项目(20060102)
关键词
固体力学
动态断裂与破碎
电磁膨胀环
无氧铜
多重颈缩
数值模拟
solid mechanics
dynamic fracture and fragmentation
electromagnetically driven ring expansion
OFHC Cu
multiple necking fracture
numerical simulation
