Design of Rupture Strength Based on Confidence Level of HK40 Steel

Abstract:

The strength of high temperature components is designed according to creep rupture strength. A statistical processing of creep rupture data of HK40 steel was performed by Z-parameter method based on Larson-Miller method. The data has been studied to evaluate the distribution under different temperature and stress. And the distribution of Z-parameter was investigated. With the application of Z-parameter, reliability design for allowable stress of creep rupture strength was carried out according to design life. The results show that the distribution of Z-parameter is supported by normal distribution. In comparison with allowable stress designed by conventional safety factor method, reliability design based on Z-parameter is more agree with experimental data.

• Periodical: Advanced Materials Research (Volume 499)
• Pages: 123-126
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.499.123
• Online since: April 2012
• Authors: Ji Bin Pei, Yun Feng Zhao, Shao Ping Yu, Jie Zhao
• Keywords: Confidence Level, Creep Rupture Strength, Reliability Design, Safety Factor Method

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DOI: 10.1115/1.4015911

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