利用铝合金疲劳裂纹扩展速率预测其断裂韧度
Estimation of Aluminium Alloy Fracture Toughness by Fatigue Crack Growth Rate
摘 要
测试了2124铝合金TL与LT取向疲劳裂纹扩展门槛值, 提出了用疲劳裂纹失稳扩展阶段最后十个循环中的最大值来估算2124铝合金TL与LT取向的断裂韧度K′C的方法,并将其与Forman公式预测的断裂韧度Kc值进行对比。结果表明: K′C与Kc值结果相近, 误差分散度小;将K′C值代入全范围疲劳裂纹扩展速率表达式中, 对2124铝合金TL和LT取向试验数据进行计算, 预测结果与试验结果较好吻合。
裂纹扩展
估算方法
fracture toughness
crack growth
estimation method
Abstract
Fatigue crack growth threshold values of 2124 aluminum alloy in TL and LT directions were tested. A method was proposed to estimate fracture toughness K′C of 2124 aluminum alloy in TL and LT directions by the maximum load in last 10 cycles in the instable expansion stage of fatigue cracks. The estimated K′C were compared with fracture toughness KC predicted using forman formula. The results show that the values of K′C were close to the values of KC, and the error dispersion was small. Fracture toughness K′C values were brought into the full range fatigue crack growth rate expression to calculate the experiment data of 2124 Al alloy in TL and LT directions, and predicted results were fitted well to the experimental results.
中图分类号 TG115.5
所属栏目 物理模拟与数值模拟
基金项目
收稿日期 2013/8/30
修改稿日期 2014/8/8
网络出版日期
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备注严芳芳(1985-)，女，河南焦作人，助教，硕士。
引用该论文: YAN Fang-fang,LI Wen-xing. Estimation of Aluminium Alloy Fracture Toughness by Fatigue Crack Growth Rate[J]. Materials for mechancial engineering, 2014, 38(12): 105～108
严芳芳,李文星. 利用铝合金疲劳裂纹扩展速率预测其断裂韧度[J]. 机械工程材料, 2014, 38(12): 105～108
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【3】房卫萍,陈沦. 损伤容限钛合金的研究进展及应用现状［J］.材料工程,2010(9):95-98.
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【5】ALEXOPOULOS N D,TIRYAKIOLU M. Relationship between fracture toughness and tensile properties of A357 cast aluminum alloy［J］.Metallurgical and Materials Transactions:A,2009,40:702-716.
【6】LEE B W, JANG J I, KWON D. Evaluation of fracture toughness using small notched specimens［J］.Materials Science Engineering:A, 2002,334:207-214.
【7】王永廉.利用疲劳裂纹扩展速率估算断裂韧性［J］.航空学报, 1997,18(6):728-731.
【8】FORMAN R G., KEARNEY V E, ENGLE R W. Numerical analysis of crack propagation in cyclic-loaded structures［J］.Journal Basic Engineering Trans ASME, 1967, 89:459-464.
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