运动热源产生的温度场的有限元分析
A Finite Element Analysis for the Temperature Field Produced by a Moving Heat Source
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摘要: 本文采用运动元法,考虑了热辐射、热交换和变热传导系数,在较宽的速度范围内研究了运动热源所产生的温度场.给出了在运动坐标和静止坐标系中,不同速度情况下温度场随时间变化的情形,给出了在运动坐标系中不同速度情况下温度场的(定常)等温线分布图.本文还讨论了动态裂纹扩展中裂纹端部过程区的塑性变形所引起的温度场,结果表明,结构钢中过程区的温度一般不会超过1000℃,或1832℉.Abstract: Using moving mesh finite element method,we discuss the temperature field produced by a moving heat source with the variable thermal conductivity and with the radioactive and convective boundary conditions in a wide range of the velocity.The temperature-time relationships at various velocities in the static and moving coordinate systems are studied.The steady-state temperature distributions at various velocities in the moving coordinate systems are given.The temperature field produced by the plastic deformation at the process region(a region very near the crack tip) is also studied,and the results show that the highest temperature at the process region is lower than 1000℃ or 1832℉.
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