基于材料裂纹扩展阻力曲线(R曲线)及裂纹扩展能量释放率理论,定义疲劳载荷下的有效能量释放率(Geff)为疲劳裂纹完全张开后用于裂纹扩展的能量,与同一载荷循环中由裂纹扩展阻力曲线表征的消耗能相等,提出了一种能够反映裂纹扩展物理本质的疲劳裂纹扩展寿命预测模型.该模型可以计算每一载荷循环中的裂纹扩展量,进而预测疲劳裂纹扩展寿命.通过试验测定了7050-T7451铝合金板材的R曲线,采用最小二乘法拟合获得到了R曲线表达式.运用本模型对同种材料耳片结构的裂纹扩展寿命进行了预测,与试验结果吻合较好,优于传统Paris模型的预测结果.
参考文献
[1] | RIGBY R;ALIABADI M H .Stress intensity factors for cracks at attachment lugs[J].Engineering Failure Analysis,1997,4(02):133-146. |
[2] | Kim JH.;Lee SB.;Hong SG. .Fatigue crack growth behavior of Al7050-T7451 attachment lugs under flight spectrum variation[J].Theoretical and Applied Fracture Mechanics,2003(2):135-144. |
[3] | 徐东,徐永成,陈循,李兴林,杨拥民.基于临界曲面的改进Paris定律球轴承疲劳寿命预测方法[J].机械工程学报,2011(02):51-57. |
[4] | 李亚智,贾敬华.一种改进的Walker裂纹扩展方程[J].西北工业大学学报,2008(02):221-224. |
[5] | 梁超,贺小帆.飞-续-飞谱下7B04-T6铝合金裂纹扩展规律试验研究[J].航空材料学报,2010(03):74-77. |
[6] | BROEK D.Elementary Engineering Fracture Mechanics[M].Leyden:Noordhoff International Publishing,1974:122-124. |
[7] | S.M.Barinov .On-crack-growth resistance curve fitting for ceramics[J].Journal of the European Ceramic Society,2000(4):383-388. |
[8] | Kim Wallin;Anssi Laukkanen .Improved crack growth corrections for J-R-curve testing[J].Engineering Fracture Mechanics,2004(11):1601-1614. |
[9] | F. Casciati;P. Colombi;L. Faravelli .Inherent variability of an experimental crack growth curve[J].Structural safety,2007(1):66-76. |
[10] | Shilang Xu;Hans W.Reinhardt .Crack extension resistance and fracture properties of quasi-brittle softening materials like concrete based on the complete process of fracture[J].International Journal of Fracture,1998(1):71-99. |
[11] | Yuting HE;Feng LI;Chaohua FAN .An Effective Energy Criterion on Fatigue Crack Growth of Metal Materials[J].Key engineering materials,2007(1):85-88. |
[12] | 肖方红 .基于小裂纹扩展的疲劳全寿命计算方法研究[D].西北工业大学,2001. |
[13] | T. Chang;W. Guo .A model for the through-thickness fatigue crack closure[J].Engineering Fracture Mechanics,1999(1):59-65. |
[14] | HB 5261-83.金属板材KR曲线试验方法[S].中华人民共和国航空工业部,1984. |
[15] | E561-08ε1.Standard test method for K-R curve determination[S].American Society for Testing and Materials |
[16] | WU L M;HE Y T;WANG X B et al.Study on fatigue crack growth model of 7075-T7410 aluminum alloy straight attachment lug[J].Applied Mechanics and Materials,2011,66/67/68:82-89. |
[17] | 吴学仁.飞机结构金属材料力学性能手册[M].北京:航空工业出版社,1996 |
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