Issue 46

M. Hack et alii, Frattura ed Integrità Strutturale, 46 (2018) 54-61; DOI: 10.3221/IGF-ESIS.46.06 54 Developments in the fracture and fatigue assessment of materials and structures A progressive damage fatigue model for unidirectional laminated composites based on finite element analysis: theory and practice M. Hack, D. Carrella-Payan, B. Magneville Siemens PLM Software, Germany michael.hack@siemens.com , https://orcid.org/0000-0003-3919-1118, T. Naito, Y. Urushiyama Honda R&D Co Ltd, Tochigi, Japan W. Yamazaki, T. Yokozeki University of Tokyo, Japan W. Van Paepegem Ghent University, Belgium A BSTRACT . The simulation of the fatigue damage of laminated composites under multi-axial and variable amplitude loadings has to deal with several new challenges and several methods of damage modelling. In this paper we present how to account for the complex loading by using the damage hysteresis operator approach for fatigue. It is applied to a fatigue model for intra-laminar damage based on stiffness degradation laws from van Paepegem [1]and has been extended to deal with unidirectional carbon fibres. The parameter identification method is presented here and parameter sensitivities are discussed. The initial static damage of the material is accounted for by using the Ladevèze damage model and the permanent shear strain accumulation based on Van Paepegem’s formulation. This approach has been implemented into commercial software. The intra-laminar fatigue damage model combines efficient methods with a low number of tests to identify the parameters of the stiffness degradation law, this overall procedure for fatigue life prediction is demonstrated to be cost efficient at industrial level. K EYWORDS . Composite; Fatigue; Variable Amplitude; Stiffness degradation. Citation: Hack, M., Carrella-Payan, D., Magneville, B., Naito, T., Urushiyama, Y., Yamazaki, W., Yokozeki, T., Van Paepegem, W, A progressive damage fatigue model for unidirectional laminated composites based on finite element analysis: theory and practice, Frattura ed Integrità Strutturale, 46 (2018) 54- 61. Received: 07.03.2018 Accepted: 20.04.2018 Published: 01.10.2018 Copyright: © 2018 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION he increase of lightweight material in transportation industries is today facing greater scrutiny on fatigue life prediction of composite structures based on realistic load situations. The critical step towards accurate prediction is to reproduce the loading conditions undergone by the composite component. In automotive applications, the T