And the relation between plastic zone size and load frequency is only qualitatively analyzed up to now.
而对载荷频率与塑性区域尺寸之间关系仅有定性描述。
The plastic zone size of the crack tip is relative to three dimensional constraint which depends upon not only the plate thickness but also the load and the material property.
裂纹尖端塑性区的大小与其三维约束状态有关，而三维约束状态不仅与板厚还与外载荷、材料性质有关。
Comparison of four different combinations of the same time, the stress and strain distribution, the size of the plastic zone.
同时对比了在四种不同组合时，应力、应变的分布，塑性区范围的大小。
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。
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。
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