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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Quantification of the effect of specimen geometry on the fatigue crack growth response by two-parameter fracture mechanics
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Quantification of the effect of specimen geometry on the fatigue crack growth response by two-parameter fracture mechanics

机译：通过两参数断裂力学量化试样几何形状对疲劳裂纹扩展响应的影响

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摘要

Discrepancies in fatigue crack growth rate and threshold values observed in different specimen geometries are analyzed and discussed. To explain the discrepancies, a phenomenological approach is suggested going out from the assumption of linear elastic fracture mechanics. To this aim, two-parameter constraint-based fracture mechanics is used and the different levels of constraint in the vicinity of the fatigue crack tip are characterized by means of the T-stress. The results of the theoretical analyses correspond to the presented experimental data. It is concluded that under small scale yielding conditions (corresponding to high cycle loading) low level of the constraint (corresponding to negative values of the T-stress) substantially increases the rate of the fatigue crack propagation. The results presented make it possible to relate the experimentally measured data obtained on the specimens with different geometries and thereby contribute to more reliable estimates of the residual fatigue life of structures.
机译：分析和讨论了在不同试样几何形状下观察到的疲劳裂纹扩展速率和阈值的差异。为了解释差异，建议从线性弹性断裂力学的假设出发采用现象学方法。为此，使用了基于两参数约束的断裂力学，并通过T应力表征了疲劳裂纹尖端附近不同程度的约束。理论分析的结果与所提供的实验数据相对应。结论是，在小规模屈服条件（对应于高周向载荷）下，较低的约束水平（对应于T应力的负值）会大大提高疲劳裂纹扩展的速度。呈现的结果使将在不同几何形状的试样上获得的实验测量数据联系起来成为可能，从而有助于更可靠地估计结构的残余疲劳寿命。

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