基于有限元方法对承受交变载荷的大尺寸异种钢焊接管板结构的应力应变场分布与变化的分析结果,预测了疲劳裂纹的产生位置,并进行了相应的疲劳试验研究.结果表明,焊接接头的受拉表面和受压表面焊趾部位分别为所在表面的最大应力和应力幅的峰值位置,且由于在第一个循环周期加载过程中产生塑性变形,导致稳定循环加载期间两侧焊趾部位均承受拉-压式交变应力,致使疲劳裂纹在上下表面焊趾处单独启裂,并沿熔合线作小距离扩展后进入母材,在近似垂直表面方向向母材内部作进一步扩展,相比之下,受压面裂纹深度要远小于受拉面裂纹深度.
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