An Interactive Web-Based Fatigue Analysis Tool

Abstract

An interactive with easy four-steps, web-based fatigue analysis and life prediction tool is presented. Users around the globe may access it via Internet by means of multiple platforms such as desktop and laptop computers, tablets and/or smart-phones. It is a self-explanatory education software, which is aimed also to assist a designer in a pre-prototype stage in fatigue life estimation of smooth or notched parts subjected to constant amplitude, block loading, and spectrum loading histories. For spectrum amplitude loading a dedicated spectrum software package is provided, which is essential for a potential clean-up and/or desired modifications of a raw spectrum data. Subsequently, a rainflow method is utilized and the corresponding hysteresis loops at the notch-root or critical “hot spot” location are determined and plotted.For notched components, a generalized Neuber’s rule suitable for numerical application is utilized and discussed. It is shown, that the so called Neuber’s “master” curve, involved in such analysis is unique and is only material dependent. The Neuber’s “master” curve is interactive and is applicable for both monotonic and cyclic loading situations. Examples of applications of the proposed method are presented for a constant, block, and spectrum loading situations. Associated fatigue life predictions are calculated using stress, strain, and stress/strain approaches.