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Damage Rate Laws and Failure Statistics for Lumped Coupled-Field Systems via Averaging (2312.17350v1)

Published 28 Dec 2023 in physics.app-ph, cond-mat.stat-mech, cs.SY, and eess.SY

Abstract: We study the non-linear dynamics and failure statistics of a coupled-field fatigue damage evolution model. We develop a methodology to derive averaged damage evolution rate laws from such models. We show that such rate laws reduce life-cycle simulation times by orders of magnitude and permit dynamical systems analysis of long-time behavior, including failure time statistics. We use the averaged damage rate laws to study 1 DOF and 2 DOF damage evolution models. We identify parameter regimes in which the systems behave like a brittle material and show that the relative variability for failure times is high for such cases. We also use the averaged rate laws to construct damage evolution phase portraits for the 2 DOF system and use insights derived from them to understand failure time and location statistics. We show that, for brittle materials, as the relative variability in failure time increases, the variability in failure location decreases.

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