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| Fatigue Reliability Analysis Based on Crack Growth Model of
Total Fatigue Life for Titanium Alloy Spherical Shell |
| CHEN Cheng-Hao, XUE Hong-Xiang, TANG Wen-Yong |
| (State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract Considering that the short crack propagation life of titanium alloy is longer, based on total fatigue life model of Brown-Hobson model, this paper presented a solution to the total fatigue life prediction for titanium alloy spherical. The paper analyzed the total fatigue life model for reliability with non-cross terms quadratic response surface method, gave the impact of different parameters on the reliability index. The method is applied to the fatigue analysis of 4.5 km manned submersible which is under development. The deterministic analysis was carried out according to the load-time spectrum and then the influence of different parameters on the structure stability was analyzed, which has important significance on the fatigue design of the manned submersible.
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Received: 07 March 2012
Published: 28 February 2013
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