The crack size is crucial for structure fatigue design, fracture mechanics analysis, judgment criterion of fracture and fracture control.

裂纹几何尺寸是在结构的抗疲劳设计、疲劳断裂力学分析、断裂判据和疲劳断裂控制中非常重要的依据。

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Finally, applying Probabilistic Fracture Mechanics Approach (PFMA), the reliability analysis is carried out for helicopter metal material (aluminum alloy) structure having initial cracks.

最后，应用概率断裂力学方法(PFMA)，对含初始裂纹体的直升机金属材料(铝合金)构件的疲劳裂纹扩展寿命进行可靠性分析。

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Fracture mechanics. A technique of fracture analysis used to determine the stress level at which preexisting cracks of known size will propagate, leading to fracture.

一门断裂分析技术，用于确定已知尺寸的预先存在裂纹扩展并导致断裂的应力水平。

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