The result shows: the local residual tensile stress and cyclic compressive loading thrust fatigue crack initiation and propagation in the size of compressive plastic zone.
结果表明，疲劳裂纹是在残余拉应力和循环压应力作用下萌生和扩展的，压塑性变形是裂纹萌生和扩展的必要条件。
Whole weldment includes practically elastic deformation zone, compressive plastic deformation zone, tensile plastic deformation zone and melting pool.
整个焊接板由弹性变形区、压缩塑性变形区、拉伸塑性变形区和熔池组成。
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