Issue 38

D. Carrella-Payan et alii, Frattura ed Integrità Strutturale, 38 (2016) 184-190; DOI: 10.3221/IGF-ESIS.38.25 184 Focussed on Multiaxial Fatigue and Fracture Implementation of fatigue model for unidirectional laminate based on finite element analysis: theory and practice D. Carrella-Payan, B. Magneville, M. Hack, C. Lequesne Siemens PLM Software Delphine.carrella@siemens.com, Benoit.magneville@siemens.com, Michael.hack@siemens.com , cedric.lequesne@siemens.com T. Naito, Y. Urushiyama Honda R&D Co Ltd, Tochigi, Japan Tadashi_Naito@n.t.rd.honda.co.jp , Yuta_Urushiyama@n.t.rd.honda.co.jp W. Yamazaki, T. Yokozeki University of Tokyo, Japan (Jp) yamazaki_w@aastr.t.u-tokyo.ac.jp , yokozeki@aastr.t.u-tokyo.ac.jp W. Van Paepegem Ghent Univeristy, Belgium Wim.VanPaepegem@UGent.be A BSTRACT . The aim of this study is to deal with the simulation of intra- laminar fatigue damage in unidirectional composite under multi-axial and variable amplitude loadings. The variable amplitude and multi-axial loading is accounted for by using the damage hysteresis operator based on Brokate method [6]. The proposed damage model for fatigue is based on stiffness degradation laws from Van Paepegem combined with the ‘damage’ cycle jump approach extended to deal with unidirectional carbon fibres. The parameter identification method is here presented 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 is implemented into commercial software (Siemens PLM). The validation case is run on a bending test coupon (with arbitrary stacking sequence and load level) in order to minimise the risk of inter-laminar damages. This intra-laminar fatigue damage model combined 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. This work concludes on the next challenges to be addressed (validation tests, multiple-loadings validation, failure criteria, inter-laminar damages…). K EYWORDS . Composite; Fatigue; Variable Amplitude; Stiffness degradation. Citation: Carrella-Payan, D., Magneville, B., Hack, M., Lequesne, C., Naito, T., Urushiyama, Y., Yamazaki, W., Yokozeki, T., Van Paepegem, W., Implementation of fatigue model for unidirectional laminate based on finite element analysis: theory and practice, Frattura ed Integrità Strutturale, 38 (2016) 184-190. Received: 10.05.2016 Accepted: 25.06.2016 Published: 01.10.2016 Copyright: © 2016 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.