How to evaluate the fatigue life of textile composite structures by the numerical analysis and the experimental data with scatter

13th International Conference on Textile Composites

Zako, Masaru^1,2

Graduate School of Engineering, Osaka University, Osaka, Japan^1

Expert Adviser of ITOCHU Techno-Solutions Corporation, Japan^2

关键词: Confidence levels;    Failure Probability;    Fatigue phenomenons;    Goodman diagram;    Hydrogen gas;    Maximum stress;    Probability of failure;    Safety evaluations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/406/1/012005/pdf
DOI  :  10.1088/1757-899X/406/1/012005

来源: IOP

【 摘 要 】

The fatigue test data and Goodman diagram have employed in order to evaluate the safety for a long period of time. Since the discrepancies exist in the fatigue test data, a modified Goodman diagram with a failure probability and a confidence level has been proposed in this paper. The confidence level is a function of total number of test data. The proposed procedure has an advantage which can be applied to a small number of specimens. As a numerical example, a hydrogen gas tank for automobile made of CFRP has been picked up. FEM has been applied to obtain the stress under a pressure in the tank. The in and out of gas to tank is considered as a fatigue phenomenon. The safety of tank for repeated use has been evaluated by the comparison of maximum stress generated in the tank and the modified Goodman diagram with a probability of failure. It is recognized that the proposed procedure is a useful and reasonable method for safety evaluation.