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CREEM2025
CREEM 2025 - XXXI Congresso Nacional de Estudantes de Engenharia Mecânica Congresso Nacional de Estudantes de Engenharia Mecânica
A comparison between two fatigue damage accumulation rules for composite laminates under multiaxial variable amplitude loading
Submission Author:
Samuel Duran , São Paulo , Brazil
Co-Authors:
Samuel Duran, Gustavo Fernandes dos Santos, Jorge Alberto Rodriguez Duran
Presenter: Samuel Duran
doi://10.26678/ABCM.CREEM2025.CRE2025-0032
Abstract
Composite laminates are widely used in structural elements today and can experience fatigue failures under variable stresses. This paper simulates three stress time series acting at small angles from a multilayer laminate’s symmetry system. By breaking down the stress series into groups of constant stress range, mean stress, and frequency, along with material fatigue properties, it predicts the number of cycles to fatigue failure in each group. The cycle ratios can then be accumulated using various methods. The research aims to compare results from two approaches: the Linear Damage Rule (LDR) and the Batsoulas Damage Rule (BDR). Results show that BDR predicts a number of spectra passes much higher than LDR for two of the three stress series, confirming LDR’s conservatism.
Keywords
fatigue damage accumulation, variable amplitude loading, rainflow cycle counting, multiaxial stresses, Composite laminates
