Fatigue Life Modeling at CX and Interference Holes (from ERSI Workshop 2019)
Abstract: Continuation of previous year’s work by AP/ES and ESRD on crack closure. Additionally, a task evolved from USAF goals dictated at ERSI 2018 to study the residual stress redistribution at interference filled holes. The goal of this new task was to better understand interference fit fasteners and their interaction with residual stresses from cold-working (CX).
Originally presented at the Engineered Residual Stress Implementation (ERSI) Workshop 2019 in Clearfield, UT.
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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