Pros and Cons of 3D Crack Growth Simulation using Finite Elements
Abstract: Recent advances in fatigue crack growth simulation technology make it possible to predict crack size and shape as a function of load cycles for more complex structural configurations than previously possible. These technology advances, often based on computing stress intensity factors (SIFs) using the finite element method (FEM), allow the removal of many of the limiting assumptions previously required for analysis but also introduce new sources of error (the errors of approximation) which must be considered and controlled for effective use of numerical simulation in the prediction of fatigue life.
Originally presented as a track presentation at the 2017 ASIP conference in Jacksonville, FL.
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The software provides a highly reliable and user-friendly production stress analysis tool that will replace the Finite Element Method (FEM) tools and failure criteria the experts currently employ for analyzing bonded joints. The software includes an FEM-based handbook format, which allows non-experts to utilize models prepared by specialists. The handbook problems include built-in failure criteria, geometric and material nonlinearities, and the modern FEM technology provides better error control and the treatment of very large aspect ratios.”
Dr. Stephen P. EngelstadTechnical Fellow, Lockheed Martin Aeronautics Company, Structural Methods and Analysis