UBC Theses and Dissertations
A comparison between two methods of fatigue lifetime predictions for random loads Jonk, Eric Frederick
The purpose of this thesis is to compare the results obtained from two different methods to account for fatigue, the Root Mean Square (RMS) and the Histogram, to determine which method better represents reality. The test procedure used subjected compact tension specimens to randomly selected block loads, then compared the actual lifetimes obtained by experiment to the lifetimes predicted by the methods. A statistical analysis was attempted to determine which method was superior. The results of the analysis suggest that the RMS model is superior. However, no firm conclusions can be drawn, since the data obtained suggest that the Paris Law parameters used in the analysis are possibly biased.