7085-T7452铝合金复合型疲劳单裂纹应力强度因子计算

Numerical calculation of stress intensity factor of Mixed-mode crack in 7085-T7452 aluminum alloy based on the displacement extrapolation method

为探究7085-T7452铝合金I-Ⅱ复合型加载下疲劳裂纹扩展机理,利用ANSYS软件建立了含裂纹T7452铝合金的有限元模型,运用最大环向拉应力准则计算复合型裂纹扩展方向,计算出T7450铝合金复合型加载下裂纹尖端应力强度因子;同时研究了复合型裂纹扩展过程中I、Ⅱ型裂纹应力强度因子变化规律.

To explore the mechanisms of crack in 7085-T7452 aluminum alloy, a finite element model of the aluminum alloy with Mixed-mode crack was established by using ANSYS. To calculation the Mixed-mode crack propagation direction through the maximum circumferential stress criterion, the stress intensity factor of Mixed-mode crack were calculated. At the same time, the change rule of stress intensity factor of I and Ⅱwas studied.