Issue 62

E.V. Lomakin et alii, Frattura ed Integrità Strutturale, 62 (2022) 527-540; DOI: 10.3221/IGF-ESIS.62.36

Influence of manufacturing shrinkage and microstructural features on the strength properties of carbon fibers/PEEK composite material

E.V. Lomakin, B.N. Fedulov Department of Mechanics and Mathematics, Lomonosov Moscow State University, Russia evlomakin@yandex.ru, http://orcid.org/0000-0002-8716-5363 fedulov.b@mail.ru, http://orcid.org/0000-0002-1894-5964 A.N. Fedorenko Center for Materials Technologies, Skolkovo Institute of Science and Technology, Russia alexey.n.fedorenko@gmail.com, https://orcid.org/0000-0002-3260-7531 A BSTRACT . This research discusses the micromechanical modelling for thermoplastic composite material. Elastoplastic and damage model for PEEK matrix composite with the dependency of properties to stress state is presented. Plasticity initiation conditions and failure criterion are analyzed. The influence of manufacturing residual stresses is considered. All typical engineering experiments for neat PEEK under different stress state are good predicted by the model. Numerical experiment for macro-properties estimation based on micromechanical model is conducted and the results are compared with the test data. K EYWORDS . Composites; Micromechanics; PEEK matrix; Mechanical properties.

Citation: Lomakin, E. V., Fedulov, B. N., Fedorenko, A. N., .Influence of manufacturing shrinkage and microstructural features on the strength properties of carbon fibers/PEEK composite material, Frattura ed Integrità Strutturale, 62 (2022) 527-540.

Received: 08.07.2022 Accepted: 09.09.2022 Online first: 12.09.2022 Published: 01.10.2022

Copyright: © 2022 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 modelling of cracking and failure of fiber-reinforced composites is challenging due to their inherent heterogeneity and numerous damage modes. On the macro-level, it is possible to represent every composite layer as anisotropic homogenized solid, and to combine continuum damage model for intra ‐ laminar failure [1,2] with a cohesive zone model (CZM) for inter ‐ laminar cracking [3]. While different techniques were proposed for the application of cohesive elements in finite element model (FEM) [4,5], the main disadvantage is the restriction of cracking only along predefined trajectories. An extended finite element model (XFEM) allows the simulation of crack propagation in arbitrary direction [6,7]. Due to the computational costs, alternative numerical methods were developed, i.e. based on floating node method with cohesive elements inserted in front of the crack tip [8]. T

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