Abstract
This paper described a fatigue damage evaluation method for variable multiaxial fatigue loadings. The progress of computer and finite element analysis technologies enables designers to solve the complex stress or strain states in actual components even though external forces change with time. The designers are now in need of a method or technology to evaluate the analysis results properly. Considering such background, the authors had developed the visualizing tool to display the loading history on virtual space and quantify the multiaxiality. In this study, six kinds of low-cycle multiaxial fatigue tests for Ti-6Al-4V were conducted with the various combinations of axial and shear strains. Then the test waves were counted by the visualizing tool, and the multiaxiality also computed for all tests. The fatigue lives were predicted for all tests by using the information obtained from the developed tool and the Miner's rule. The method was confirmed to predict the fatigue lives with the accuracy of the factor of 2.
