Overview

Fatigue Life LLC is a company dedicated to metal fatigue technologies in structures, pressure vessels and piping systems. We develope FFSpro, Fatigue+ and SFAT software packages. FatiguePlus and SFAT are two separate design code compliance software packages. In a general sense, FatiguePlus is mechanical engineering oriented while SFAT focuses on structural engineering. Fatigue involves complex phenomena and mechanism, and the design codes constantly change as researches, practices and experiences evolve. Using FatiguePlus and SFAT the user can minimize risk of failure from cyclic loading and ensure design code compliance by applying automated fatigue life analysis, making the complicated tasks easy. In addition, FatiguePlus provides a generic fatigue life analysis module that incorporate Basquin model, Basquin-Coffin-Manson model, Kandil-Brown-Miller model, Socie-Fatemi model and Matake Criterion. FatiguePlus and SFAT can handle cyclic loading from as simple as a single stress value, to component stresses of large number of nodes/elements in large number of loading steps generated by ANSYS. Stress history files generated by other FEA packages can also be imported and processed. Data input can be generated by manual entry, by importing ANSYS .rst files, or by importing stress history files. The loading can be of constant amplitude or variable amplitude, proportional or non-proportional. For non-proportional loading conditions, the programs scan for critical plane that generates the highest fatigue damage ratio, thanks to the multiaxial capability of the programs. FatiguePlus and SFAT calculate fatigue damage ratios for each loading cycle, sums cumulative damage ratios using Miner's Rule, and counts the number of loading cycles using rainflow counting algorithm following ASTM 1049 procedure. In addition to reporting calculations, the graphical charts of stress range time history, stress range histogram and fatigue damage ratios are also generated.