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Repeatability of Progressive Damage Methods
Abstract
The objective of this paper is to explore the finer points of ensuring maximum repeatability in computational results from modern progressive damage, strength, and life prediction methods for laminated composite materials and structures. Separate sections focus on various input properties and computational solution techniques for such tools. Precision of input property test methods, appropriateness of measured input values for particular failure criteria, and proper accounting of physics-based effects such as residual thermal stresses and geometric uncertainties are discussed. Computational choices regarding numerical solvers (explicit, implicit, other), element types, mesh refinement, convergence strategies, etc. are addressed. Recognition is made of the inherent compromises in terms of run-time, physical behavior modeling, and strength/life prediction accuracy. The difference between code verification and prediction validation is also addressed. Finally, the paper summarizes the overall issues and decisions affecting the repeatability of salient strength/life predictions of complex laminated composite structural behavior.
DOI
10.12783/asc35/34969
10.12783/asc35/34969