Crack Path Analysis Technical Brief
Abstract: The objective of this work revolves around a need for an accurate numerical simulation method that computes the stress intensity factors (SIF) along a predicted crack propagation path for planar two dimensional bodies. In response to this need, ESRD has developed an automated procedure in StressCheck®, a p-version finite element analysis (FEA) tool, that computes through-crack stress intensity factors for mode I and mode II along a predicted crack propagation path. This functionality is applicable to planar analysis (2D plate with in-plane loading). The trajectory of the crack is determined by a relationship between mode I and mode II SIF’s (K1 and K2) and is shown to be very accurate.
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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