Release Time:2019-03-11  Hits:

Indexed by: Conference Paper

Date of Publication: 2012-03-27

Included Journals: Scopus、CPCI-S、EI

Volume: 476-478

Page Number: 2552-+

Key Words: Reliability design; Allowable stress; Creep rupture strength; Normal distribution

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.