AH36钢含裂纹板与加筋板低周疲劳裂纹扩展试验  

Experimental Study on Low-cycle Fatigue Crack Propagation of Cracked Plate and Stiffened Plate Based on AH36 Steel

作　　者：梁越冰 杨平[1,2] 余志锋[1] LIANG Yue-bing;YANG Ping;YU Zhi-feng(School of Transportation;Wuhan 430063,China;Key Laboratory of High Performance Ship Technology of Ministry of Education,Wuhan 430063,China)

机构地区：[1]武汉理工大学交通学院,武汉430063 [2]武汉理工大学高性能船舶技术教育部重点试验室,武汉430063

出　　处：《船海工程》2018年第5期15-18,共4页Ship & Ocean Engineering

基　　金：国家自然科学基金(51779198)

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.

关 键 词：低周疲劳 疲劳寿命 过载 裂纹扩展速率 

分 类 号：U661.72[交通运输工程—船舶及航道工程] TG146.21[交通运输工程—船舶与海洋工程]