ESRD will be attending AA&S 2017 in Phoenix, AZ from May 22-25. Come visit Gordon and Jason at our booth (119) and attend Jason’s training course “StressCheck + Fracture: Best Practices & Live Demo” on Monday, May 22, 2017 @ 6PM.
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ESRD's NAFEMS America 2017 Aerospace Simulation Engineering conference presentations available for download [...]
The World-Wide Failure Exercise (WWFE) was an international research project with the goal of assessing the predictive performance of competing failure models for composite materials. Part I (WWFE-I) focused on failure in fiber-reinforced polymer composites under two-dimensional (2D) stresses and ran from 1996 until 2004. Part II was concerned with failure criteria under both 2D and 3D stresses, and ran between 2007 and 2013. Part III, also launched in 2007, was concerned with damage development in multi-directional composite laminates.
Turtle Shells and Legacy Finite Element Codes: Evolutionary Constraints in the Age of Explainable AI
This blog post explains why legacy finite element codes are like a turtle’s carapace: a protective structure that provided a survival advantage in the resource-scarce 1960s but now impedes the flexibility needed to meet the demands of explainable AI (XAI). The good news is that the technology required to support XAI already exists.
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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. Engelstad
Technical Fellow, Lockheed Martin Aeronautics Company, Structural Methods and Analysis
Serving the Numerical Simulation community since 1989 






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