Abstract Regarding to fatigue damage of boiler drum

the paper proposes a new method by which shape parameter m

dimension parameter α and position parameter N o can be determined when a probability fatigue damage accords with the three parameters Weibull distribution. To calculate the distribution parameters

the analytical method is considered to be very complicated and the graphic method too rough.So.the use of three parameters Weibull distribution in analysis of probability fatigue damaging is being limited in some extent. This paper describes a way to combine the graphic method with optimization to gain the three distribution parameters. Then a program has been worked out with C language. The results of this program fit very well with the data of fatigue life test on several heat-resistant steels. It shows that this new method to determine three parameters of Weibull distribution is very simple and practical.