AH36钢含裂纹板与加筋板低周疲劳裂纹扩展试验
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摘要
对AH36钢含裂纹板与加筋板试样,在恒幅和变幅拉伸循环载荷下进行裂纹扩展试验,探讨有无加强筋以及在基本循环中插入单个拉伸过载情况下的低周疲劳寿命及裂纹扩展速率的规律,结果表明,AH36钢对应力比效应较敏感;恒幅循环载荷下,加强筋能有效增大疲劳寿命;在一定范围内过载比越大,过载迟滞效应也越明显,过载的迟滞效应可有效减小裂纹扩展速率。
The behavior of crack propagation under constant amplitude and variable amplitude tensile cyclic loading was studied for the crack plate and stiffened plate specimens of AH36 steel. The rule of low cycle fatigue life and crack propagation rate under the condition of single tensile overload was inserted into the ring. The test results showed that the AH36 steel is sensitive to the force ratio effect; the reinforcement can effectively increase the fatigue life under the constant amplitude cycle load; the greater the overload ratio in a certain range,the more obvious the overload retardation effect is,and the overload retardation effect reduces the crack propagation rate effectively.
The behavior of crack propagation under constant amplitude and variable amplitude tensile cyclic loading was studied for the crack plate and stiffened plate specimens of AH36 steel. The rule of low cycle fatigue life and crack propagation rate under the condition of single tensile overload was inserted into the ring. The test results showed that the AH36 steel is sensitive to the force ratio effect; the reinforcement can effectively increase the fatigue life under the constant amplitude cycle load; the greater the overload ratio in a certain range,the more obvious the overload retardation effect is,and the overload retardation effect reduces the crack propagation rate effectively.
引文
[1] HUANG Xiaoping,TORGEIR Moan,CUI Weicheng.An engineering model of fatigue crack growth under variable amplitude loading[J]. International journal of fatigue,2008,30:2-10.
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[5]余志锋,杨平,董琴,等.常幅和过载下CT试件的低周疲劳裂纹扩展试验研究[J].武汉理工大学学报(交通科学与工程版),2017,41(3):488-492.
[6]BACILA A,DECOOPMAN X,MESMACQUE G,et al.Study of underload effects on the delay induced by an overload in fatigue crack propagation[J]. International journal of fatigue,2007,29(9/10/11):1781-1787.
[7]刘燕红,朱锡,黄祥兵. 921A钢结构低周疲劳裂纹扩展特性试验研究[J].海军工程大学学报,2008(4):69-74.
[8]刘燕红,朱锡,陈长海.拉伸载荷下加筋板裂纹扩展研究[J].船海工程,2015,44(3):49-53.
[9]PARIS P C,ERDOGAN F. A oritical analysis of crack propagation laws[J]. Journal of Basic Engineering1963,85(4):528-533.
[2]聂德福,赵杰. AZ31镁合金疲劳裂纹扩展和过载效应[J].中国有色金属学报,2008(5):771-776.
[3] DONG Qin,YANG Ping,DENG Junlin,et al. Research on low-cycle-fatigue crack propagation life for ship plate based on accumulative plastic damage[J].Journal of Ship Mechanics,2015,19(6):690-699.
[4]李晓宇.单个拉伸过载下金属材料疲劳裂纹扩展行为的研究[D].合肥:合肥工业大学,2015.
[5]余志锋,杨平,董琴,等.常幅和过载下CT试件的低周疲劳裂纹扩展试验研究[J].武汉理工大学学报(交通科学与工程版),2017,41(3):488-492.
[6]BACILA A,DECOOPMAN X,MESMACQUE G,et al.Study of underload effects on the delay induced by an overload in fatigue crack propagation[J]. International journal of fatigue,2007,29(9/10/11):1781-1787.
[7]刘燕红,朱锡,黄祥兵. 921A钢结构低周疲劳裂纹扩展特性试验研究[J].海军工程大学学报,2008(4):69-74.
[8]刘燕红,朱锡,陈长海.拉伸载荷下加筋板裂纹扩展研究[J].船海工程,2015,44(3):49-53.
[9]PARIS P C,ERDOGAN F. A oritical analysis of crack propagation laws[J]. Journal of Basic Engineering1963,85(4):528-533.