For the fatigue life of thin-walled components, not only fatigue crack initiation, but also crack growth is decisive. The phase-field method for fracture is a powerful tool to simulate arbitrary crack phenomena. Recently, it has been applied to fatigue fracture. Those models pose an alternative to classical fracture-mechanical approaches for fatigue life estimation. In the first part of this paper, the parameters of a phase-field fatigue model are calibrated and its predictions are compared to results of fatigue crack growth experiments of aluminium sheet material. In the second part, compressive residual stresses are introduced into the components with the help of laser shock peening. It is shown that those residual stresses influence the crack growth rate by retarding and accelerating the crack. In order to study these fatigue mechanisms numerically, a simple strategy to incorporate residual stresses in the phase-field fatigue model is presented and tested with experiments. The study shows that the approach can reproduce the effects of the residual stresses on the crack growth rate.

对于薄壁部件的疲劳寿命，不仅疲劳裂纹萌生，而且裂纹扩展也是决定性的。断裂的相场方法是模拟任意裂纹现象的有力工具。近来，它已被应用于疲劳断裂。这些模型替代了经典的断裂力学方法来估计疲劳寿命。在本文的第一部分中，对相场疲劳模型的参数进行了校准，并将其预测结果与铝板材料的疲劳裂纹扩展实验结果进行了比较。在第二部分中，借助激光冲击喷丸将压缩残余应力引入组件。结果表明，这些残余应力通过延迟和加速裂纹来影响裂纹扩展速率。为了从数值上研究这些疲劳机理，提出了一种将残余应力纳入相场疲劳模型的简单策略，并通过实验进行了测试。研究表明，该方法可以重现残余应力对裂纹扩展速率的影响。