Effects of Thermal Residual Stress on Fatigue Life of Double-Side Adhesively Bonded Composite Repairs to Cracked Aluminum Alloy Plate Containing Crack
摘 要
为研究残余热应力对复合材料双面胶接修复损伤金属结构疲劳寿命的影响, 利用T300/E51复合材料补片对含中心裂纹的LY12CZ铝合金板进行双面胶接修复, 研究了修复结构的疲劳寿命, 并通过断口分析反推出了疲劳裂纹的扩展情况; 利用Abaqus软件建立了考虑残余热应力的修复结构的三维有限元模型, 分别计算了应力强度因子随裂纹长度的变化关系, 并利用二次多项式拟合得到了应力强度因子幅值与裂纹长度的关系式; 最后, 利用Pairs公式材料常数修正法, 对修复结构的疲劳寿命进行了预测。结果表明: 在相同的疲劳载荷条件下, 裂纹板修复结构的疲劳寿命约为未修复裂纹板的23倍; 残余热应力会增加裂纹尖端的应力强度因子;有限元模拟的裂纹板修复结构的疲劳寿命与试验结果吻合较好, 相对误差为3.7%。
Abstract
In order to study the effect of thermal residual stress on fatigue life of double-side adhesively bonded composite repairs to damaged metallic plate, LY12CZ aluminum alloy plate containing crack was adhesively bonded with E300/E51 composite patches in two-sides, and the fatigue life of the repaired structure was studied; The crack growth was also investigated from the fracture surface analysis. Simultaneously, the 3-D finite element model with respect of thermal stress effects was built by Abaqus software, and the relations between stress intensity factor (SIF) and crack length were also been calculated by the finite element model. Meanwhile, the relationship between the SIF amplitude and crack length also was got by quadratic polynomials fitting. At last, the materials constant correction method of Pairs law was applied for the fatigue life prediction of the repaired structure. The results indicate that, under the same fatigue load conditions, the fatigue life of cracked plate repaired structure was 23 times as great as unrepaired cracked plate; SIF increased with the increase of thermal residual stress; the fatigue life of cracked plate repaired structure, which was predicted by finite element model, was in good agreement with the experimental result, and the relative error was 3.7%.
中图分类号 TB332 DOI 10.11973/jxgccl201609009
所属栏目 物理模拟与数值模拟
基金项目 总装“十二五”预研项目(4010901030201)
收稿日期 2015/8/12
修改稿日期 2016/7/18
网络出版日期
作者单位点击查看
备注牛勇(1987-), 男, 黑龙江伊春人, 博士研究生。
引用该论文: NIU Yong,LI Xu-dong,MU Zhi-tao,HAO Jian-bin. Effects of Thermal Residual Stress on Fatigue Life of Double-Side Adhesively Bonded Composite Repairs to Cracked Aluminum Alloy Plate Containing Crack[J]. Materials for mechancial engineering, 2016, 40(9): 38~42
牛 勇,李旭东,穆志韬,郝建滨. 残余热应力对复合材料双面胶接含裂纹铝合金板修复结构疲劳寿命的影响[J]. 机械工程材料, 2016, 40(9): 38~42
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参考文献
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【3】ALBEDAH A, BACHIR B B, OUDDAD W, et al. Elastic plastic analysis of bonded composite repair in cracked aircraft structures[J]. Journal of Reinforced Plastics of Composites, 2011, 30(1): 66-72.
【4】QUDAD W, BACHIR B B, BELHOUARI M, et al. Analysis of the plastic zone size ahead of repaired cracks with bonded composite patch of metallic aircraft structures[J]. Computer Material Science, 2009, 46:950-954.
【5】ROSE L R F. A cracked plate repaired by bonded reinforcements [J]. International Journal of Fracture, 1982, 18: 135-144.
【6】徐建新,张开达.复合材料补片止裂性能的方法研究[J].工程力学, 1999,16(2): 93-98.
【7】WANG Q Y, PIDAPARTI R M. Static characteristic and fatigue behavior of composite repaired aluminum plates [J] Composite Structure, 2002, 56(2): 151-155.
【8】BAKER A A. Repair of cracked or defective metallic aircraft components with advanced fibre composites [J]. Composite Structure ,1984, 2(2):153-181.
【9】张移山,华庆祥.复合材料补片参数对裂纹尖端应力强度因子的影响[J].机械强度, 2004, 26(z1):100-103.
【10】王清远,陶华.复合材料修补件的强度和疲劳性能[J]. 材料工程, 2003(1): 21-24.
【11】WANG C H, ROSE L R F, CALLINAN R J. Thermal stresses in a plate with a circular reinforeement [J]. International Journal of Solids and Structures, 2000, 37(33):4577-4599.
【12】FREDELL R S. Damage tolerant repair techniques for pressurized aircraft fuselages [D]. Delft: Delft University of Technology, 1994.
【13】DAVERSCHOT D R, VLOT A, WOERDEN H J M. Thermal residual stresses in bonded repairs[J]. Applied Composite Materials, 2002, 9:179-197.
【14】王遵.复合材料单面补强含裂纹铝合金薄板的残余热应力及其影响研究[D]. 长沙:国防科学技术大学, 2007.
【15】梁重云.复合材料与补修航空铝合金结构件的性能匹配性研究[D]. 长沙:国防科学技术大学, 2002.
【16】苏维国,穆志韬, 朱做涛, 等. 金属裂纹板复合材料单面胶接修补结构应力分析[J]. 复合材料学报,2014,31(3):772-780.
【17】BAKER A A. Repair of crack or defective metallic components with advanced fiber composite[J]. Composite Structure, 1984, 2:153-181.
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