Abstract Simulation models were constructed to explore the influence of compressive residual stress on fatigue crack growth rates in aluminium sheet. Balanced residual stress fields resulting from imposition of compressive stresses in laser peen patches were calculated. Growth rates of cracks approaching, traversing and propagating away from peen patches were calculated using modified superposition models. Effects of patch dimensions and position on residual stress fields, growth rates and life were investigated. Overall life varied widely depending on the balance between retardation and acceleration; many peen arrangements had little or no life benefit. Implications of the results for damage tolerant design are discussed.

中文翻译：

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用于损伤容限飞机结构的优化激光喷丸策略

摘要 建立仿真模型，探讨残余压应力对铝板疲劳裂纹扩展速率的影响。计算了在激光喷丸补片中施加压缩应力所产生的平衡残余应力场。使用改进的叠加模型计算接近、穿过和远离喷丸补丁的裂纹的增长速率。研究了补片尺寸和位置对残余应力场、生长速率和寿命的影响。总寿命因减速和加速之间的平衡而有很大差异；许多喷头安排几乎没有或根本没有生活益处。讨论了结果对损伤容限设计的影响。