Allowable stress design of rupture strength based on confidence level of heat resistant steel
A statistical analysis of creep rupture data for 9CrlMo and HP steels is carried out in this paper.The scattering of creep rupture data is represented by Z-parameter method based on the time-temperature parameter method.With the application of Z-parameter,reliability design of allowable stress is carried out according to design life.The higher the value of confidence level,the lower the allowable stress.In comparison with allowable stress designed by safety factor method,it can be seen that confidence level is different with the same safety factor for different steels.The dispersion of material rupture property can not be taken into account by safety factor method.Reliability design provides more precise results by considering the real distribution of creep rupture property.And reliability design provides more flexible choice for design due to the need of safety and economy.
Allowable stress Rupture strength Confidence level Reliability design
Jibin Pei Yunfeng Zhao Dongming Li Jie Zhao Lai Wang
School of Materials Science and Engineering,Dalian University of Technology,Dalian,Liaoning 116024,C Dalian Boiler and Pressure Vessel Inspection Institute,Dalian,Liaoning 116013,China School of Materials Science and Engineering,Dalian University of Technology,Dalian,Liaoning 116024,C
国际会议
成都
英文
331-335
2009-10-16（万方平台首次上网日期，不代表论文的发表时间）