The Ottosen–Stenström–Ristinmaa (OSR) incremental fatigue damage model is adapted for fatigue-life assessment of integral airframes milled from 7050-T7451 aluminum plates. For validation, variable-amplitude high-cycle fatigue experiments are conducted for circumferentially notched, axisymmetric specimens, and for a geometry similar to an aircraft fuselage frame, with flanges, stiffeners, and web panels. We also describe how the parameters of the OSR model can be modified to account for surface roughness, and for setting acceptable failure probability.

中文翻译：

---

基于增量疲劳损伤建模的飞机整体结构寿命评估

Ottosen–Stenström–Ristinmaa (OSR) 增量疲劳损伤模型适用于由 7050-T7451 铝板铣削而成的整体机身的疲劳寿命评估。为了进行验证，对周向缺口轴对称样本以及类似于飞机机身框架的几何形状（具有法兰、加强筋和腹板）进行了变幅高周疲劳实验。我们还描述了如何修改 OSR 模型的参数以考虑表面粗糙度和设置可接受的故障概率。