有限元法
旋转对称性
焊接
穿透深度
源模型
机械
电子束焊接
阴极射线
渗透(战争)
材料科学
传热
光学
结构工程
复合材料
物理
电子
工程类
计算物理学
量子力学
运筹学
作者
John Goldak,Aditya Chakravarti,M.J. Bibby
出处
期刊:Metallurgical transactions. A, Physical metallurgy and materials science
[Springer Nature]
日期:1984-06-01
卷期号:15 (2): 299-305
被引量:2471
摘要
A mathematical model for weld heat sources based on a Gaussian distribution of power density in space is presented. In particular a double ellipsoidal geometry is proposed so that the size and shape of the heat source can be easily changed to model both the shallow penetration arc welding processes and the deeper penetration laser and electron beam processes. In addition, it has the versatility and flexibility to handle non-axisymmetric cases such as strip electrodes or dissimilar metal joining. Previous models assumed circular or spherical symmetry. The computations are performed with ASGARD, a nonlinear transient finite element (FEM) heat flow program developed for the thermal stress analysis of welds.* Computed temperature distributions for submerged arc welds in thick workpieces are compared to the measured values reported by Christensen1 and the FEM calculated values (surface heat source model) of Krutz and Segerlind.2 In addition the computed thermal history of deep penetration electron beam welds are compared to measured values reported by Chong.3 The agreement between the computed and measured values is shown to be excellent.
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