Fatigue Performance Analysis of Titanium Alloy Welded Joints Based on Rough Set

Abstract

Fatigue performance analysis of titanium alloy welded joints was conducted based on rough set theory in this work. The rough set model which can be used to analyze fatigue performance of titanium alloy welded joints was established through the steps of data acquisition, data preprocessing, model reduction and model reasoning. Experiment was done on the basis of the fatigue samples of the titanium alloy welded joints getting through the laboratory test to establish the rough set model. At the same time, results of fatigue performance analysis of titanium alloy welded joints by using different methods, namely, nominal stress method, structural stress method and equivalent structural stress method were compared based on the established rough set model. Results of the comparison and analysis show that the influence of such factors as material type and load type to the fatigue life of the welded joints computed by using equivalent structural stress method is less than what was computed by using nominal stress method or structural stress method. The rough set modeling method extends the application field of rough set theory as well as provides a new way for the fatigue performance and stress analysis of titanium alloy welded joints thus shows a great application potential.