-广义疲劳裂纹扩展模型在单一过载疲劳问题中的应用英文.pdfVIP

Docin Choose 豆 丁 推 荐 ↓ 精 品 文 档 The Best Literature The Best Literature ： （ ） Article ID 1007-7294 2008 06-0947-08 Application of the General Fatigue Crack Growth Model on the Single Overload Fatigue Problem 1 1 1,2 1 YI Gao-jie , WANG Yi-fei , CUI Wei-cheng , HUANG Xiao-ping (1 State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China; 2 China Ship Scientific Research Center, Wuxi 214082, China) Abstract: For Marine structures such as ships and offshore platforms there is still no uniform model on the fatigue life prediction considering the load sequence effect. In this paper, the general fatigue ’ crack growth model developed in author s group is employed to study the single overload fatigue problem. The experimental data of the aluminium alloy D16Cz is adopted for this study. Prediction results show that the general model can qualitatively predict the overload retardation phenomenon; the overload parameter β is efficient in evaluating the overload retardation.This general model is further developed by introducing a power item to predict the crack growth rate during the period of crack growth recovering to the level before overload from retardation.The general fatigue crack growth model is applied to the single overload fatigue problem and the predicted results are com- pared with the experimental data of an alluminimun alloy D16Cz. Key words: fa