摘要
裂纹止裂技术是当前航空航天、船舶、军事及机械制造等许多工业生产和实际应用中急需解决的关键问题。针对含双半圆形埋藏裂纹金属构件脉冲放电问题,在理论上推导出脉冲放电后裂纹尖端附近电流密度分布和温度场分布以及两裂纹相互之间的热影响关系,采用有限元软件建立了三维有限元模型。由理论计算与数值分析可知,两方法所得温度场分布规律一致,温度误差和相对误差分别为75.560℃、3.150%,并对含双半圆形埋藏裂纹金属构件进行了脉冲放电实验研究,脉冲放电后裂纹尖端熔化、钝化。
The application of crack prevention techniques is badly needed in various industries. There are many practical applications, such as in space flight and aviation, shipping, military affairs and machine manufacturing. The current density distribution, temperature field distribution of flow around the crack tip and the heat affected of two cracks are derived theoretically in view of the pulse discharge in metal component with double semicircle immerged crack. A three-dimensional finite element model with semicircular embedding crack is established by finite element software ANSYS to analyze the temperature filed. The distribution law of temperature field is consistent with the results of theoretical calculations and numerical results, and the maximum temperature error and relative error are 75. 560℃ and 3. 150% respectively. By pulse discharge experiments, the crack tip melts and passivated after pulse discharge.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第1期15-19,25,共6页
Journal of Chongqing University
基金
国家自然科学基金资助项目(51075351
51105325)
关键词
脉冲放电
双半圆形埋藏裂纹
裂纹止裂
数值模拟
温度场
pulse discharge
double semicircle immerged crack
crack arrest
numerical simulation
temperature field
