海洋工程用钢疲劳寿命与CTOD值关系的研究  

Research on Relationship between CTOD and Fatigue Life of Offhore Engineering Steel

作　　者：余立[1] 苗张木[1] 马涛 冷晓畅[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063 [2]上海外高桥造船有限公司,上海200137

出　　处：《武汉理工大学学报（交通科学与工程版）》2010年第2期323-327,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：工业和信息化部科研项目资助(批准号:工信部装〈2009〉382号)

摘　　要：通过对钻井平台上所用高强钢EQ70进行了韧度和疲劳性能的试验研究,得出了反映其韧度指标的裂纹尖端张开位移(CTOD)值和不同交变载荷下疲劳寿命值呈近似的线性关系.在应力幅值ΔP一定的情况下,疲劳寿命值N随着CTOD值的增大而增大,并且在高应力幅的时候,对数疲劳寿命和CTOD值有比较好的线性关系,最后还从微观意义上解释了产生这种关系的原因.Abstract：Based on the research on the experiments of toughness and fatigue performance of steel EQT0, which is mainly applied in drilling platform, linear relation is established between CTOD （Crack Tip Opening Displacement） used as an indicator of toughness of materials and fatigue life un- der alternating loads. When the stress amplitude AP is constant, the fatigue life N increases according to the raise of CTOD. Particularly, under high stress amplitude, the linear relation between the log- arithm of fatigue life and CTOD is much more conspicuous. A/so, explanation from microscopic aspect is given.

关 键 词：海洋工程 高强钢 厚板 CTOD 对数疲劳寿命 

分 类 号：TB302.3[一般工业技术—材料科学与工程]