Reliability Design for Allowable Stress of Creep Rupture Strength of 4Cr25Ni35 Steel

Abstract:

Creep rupture data plays vital role in life prediction and safety assessment of high temperature components. In order to describe the scattering of the data, a statistical analysis of creep rupture data for 4Cr25Ni35 steel was performed by Z-parameter method. With the application of Z-parameter, reliability design for allowable stress of creep rupture strength was carried out according to design life. It is found that Manson-Haferd method appears better correlation results with experimental data. Statistical analysis shows that the scattering of Z-parameter for 4Cr25Ni35 steel is supported by normal distribution. Compared with safety factor method, the method based on Z-parameter can perform reliability design for allowable stress of creep rupture strength by considering the dispersibility of the rupture data. Reliability design based on Z-parameter is more agree with experimental data.

• Periodical: Advanced Materials Research (Volumes 476-478)
• Pages: 2552-2555
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.476-478.2552
• Online since: February 2012
• Authors: Ji Bin Pei, Yun Feng Zhao, Shao Ping Yu, Jie Zhao
• Keywords: Allowable Stress, Creep Rupture Strength, Normal Distribution, Reliability Design

References

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