非对称疲劳载荷作用铆钉连接件疲劳寿命估算

基于铆钉传递载荷相同的假设，建立了非对称复杂应力状态下铆钉连接件的传递应力和旁路应力的简化公式，并给出了铆钉孔的应力严重系数计算公式.采用名义应力法和新的应力严重系数公式，计算了谱载下铆钉连接件的疲劳寿命，并与DFR（Detail Fatigue Rating）方法进行对比，计算结果表明，该法与DFR方法估算结果吻合良好，计算过程更为简便并偏于安全.

Fatigue life estimation of riveted joints subjected to asymmetrical loading

Based on the identity assumption of transfer loads of the rivets, novel simplified formulas were derived to predict transfer and bypass stresses of riveted joints subjected to complicated asymmetrical stresses, and the formula was then deduced to calculate stress severity factor (SSF) of rivet holes. Finally, new SSF formulas were applied to predict fatigue life of riveted joints subjected to a given asymmetrical stress spectrum and the calculated results were compared with those by using the detail fatigue rating (DFR) method, demonstrating the practical and effective use of the proposed simplified approach. It is shown that good correlation is achieved between the results predicted by resorting to novel simplified approach presented and in accordance with the DFR method, but the calculated result from simplified approach is more conservative than that of the DFR method.