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本文通过有限元方法分析了焊接残余应力场对激光冲击处理后形成的残余应力场的影响。以法国电力公司核反应堆冷却系统的镍合金600对接焊圆管为原型,建立了激光冲击处理的非线性弹塑性有限元模型,并引入焊接残余应力场作为数值模拟的初始条件。有限元结果表明,在有初始焊接残余应力场的情况下,一次冲击后仍能使镍合金600对接焊圆管形成残余压应力表层,但是最大压力值和压应力化深度减小;多次冲击后压应力化程度增大,且7次冲击后趋于饱和,初始焊接应力场对冲击残余应力场的影响变小,可忽略不计。
In this paper, the influence of welding residual stress field on residual stress field after laser shock treatment is analyzed by finite element method. A nonlinear elastic - plastic finite element model of laser shock treatment was established based on Ni alloy 600 butt welded round tube of the French Reynolds Power Company nuclear cooling system. The residual stress field was introduced as the initial condition of numerical simulation. Finite element results show that the residual pressure stress field of the initial welding can still make the nickel alloy butt-welded pipe form a residual compressive surface layer after a single impact, but the maximum pressure value and compressive stress depth decrease. The degree of post-stressing increases, and after seven impact tends to be saturated, the impact of initial welding stress field impact residual stress field decreases, negligible.