Bishara, M.

Brod, M.

Dean, A.

Rolfes, R.

Scheffler, S.

Scipedia

8th ECCOMAS Thematic Conference on the Mechanical Response of Composites: COMPOSITES 2021M. Fagerström & G. Catalanotti (Editors)NUMERICAL ANALYSIS OF FATIGUE DAMAGE BEHAVIOR IN FIBERCOMPOSITES UNDER DIFFERENT BLOCK LOADING CONDITIONSMartin Brod1∗, Aamir Dean1,2, Sven Scheffler1 and Raimund Rolfes11 Leibniz University Hannover, Institute of Structural Analysis, Appelstraße 9A, 30167 Hannover,Germany2 Universidad de Sevilla, Elasticity and Strength of Materials Group, School of Engineering, Caminode los Descubrimientoss s/n, 41092, Seville, Spain∗ m.brod@isd.uni-hannover.deDuring their lifetime, practically applied fiber composite structures, like components of aircraftsor wind energy turbines, are usually subjected to cyclic loading with variable load amplitudesand arbitrary load orientation. For a cost-oriented design process of complex structures, the useof computationally efficient and detailed fatigue damage tools is essential when safety-relevantdesign concepts such as damage tolerance are used.Krüger and Rolfes [1] have proposed a progressive fatigue damage model (FDM) for unidirec-tional fiber composites, which is potentially applicable for large structures. The FDM relieson a layer- and energy-based approach, and it is capable of including basic fatigue phenomena,such as load sequence effects and stress redistributions. Recently, the FDM has been succes-sively upgraded and validated for various applications, for instance for damage analyses underdifferent stress ratios [2] or inhomogeneous stress states [3].The current contribution focuses on the extension and application of the FDM for damage pre-diction under variable block loading conditions [4]. First, the model is consistently extended toconsider damage evolution under arbitrary block loading patterns. Herein, the model containeddamage evolution curves are deliberately updated. Second, lifetime predictions of coupon spec-imens are performed applying different block loading patterns. Finally, the extended FDM isused for damage analysis on different practical applications. The predictive capabilities of theFDM are evaluated by comparison with experimental findings from literature.References[1] H. Krüger and R. Rolfes (2015) A physically based fatigue damage model for fibre-reinforced plastics under plane loading. International Journal of Fatigue, 70, 241–251.[2] M. Brod, G. Just, A. Dean, E. Jansen, I. Koch, R. Rolfes and M. Gude (2019) Numericalmodelling and simulation of fatigue damage in carbon fibre reinforced plastics at differentstress ratios. Thin-Walled Structures, 139, 219–231.[3] M. Brod, A. Dean, S. Scheffler, C. Gerendt and R. Rolfes (2020) Numerical Modelingand Experimental Validation of Fatigue Damage in Cross-Ply CFRP Composites underInhomogeneous Stress States. Composites Part B: Engineering, 200, 108050.[4] M. Brod, A. Dean and R. Rolfes (2021) Numerical Life Prediction of Unidirectional FiberComposites under Block Loading Conditions using a Progressive Fatigue Damage Model.International Journal of Fatigue, 147, 106159.

Numerical Analysis of Fatigue Damage Behavior in Fiber Composites under Different Block Loading Conditions

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Numerical Analysis of Fatigue Damage Behavior in Fiber Composites under Different Block Loading Conditions

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