PSI - Issue 38

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ScienceDirect

Procedia Structural Integrity 38 (2022) 220–229 Structural Integrity Procedia 00 (2021) 000±000 Structural Integrity Procedia 00 (2021) 000±000

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© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2021 Organizers © 2021 The Authors. Published by Elsevier B.V. his is an open access article under the CC BY-NC-ND license (https: // creativecommons.org / licenses / by-nc-nd / 4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2021 Organizers . The present work shows on the one hand the influence of symmetrical and random fiber distributions on the numerical determination of the e ff ective homogenized material parameters of the unidirectional layer. On the other hand, the stress paths of sy metric and arbitrary RVE systems are analyzed and evaluated. In a fatigue-relevant consideration, the developed RVE systems map the damaging force paths between fiber and matrix. This numerical calculation of the stress on the matrix material is intended to simplify the fatigue strength assessment workflow of CFRP structures. The goal is to replace the currently required orthotropic WoÈhler curves with a WoÈhler curve for the matrix material. In investigations on pure resin samples it could be shown that the strength of these pure resin samples, corresponded to the matrix range of the numerical simulations of the RVE systems. © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https: // creativecommons.org / licenses / by-nc-nd / 4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2021 Organizers . The present work shows on the one hand the influence of symmetrical and random fiber distributions on the numerical determination of the e ff ective homogenized material parameters of the unidirectional layer. On the other hand, the stress paths of symmetric and arbitrary RVE systems are analyzed and evaluated. In a fatigue-relevant consideration, the developed RVE systems map the damaging force paths between fiber and matrix. This numerical calculation of the stress on the matrix material is intended to simplify the fatigue strength assessment workflow of CFRP structures. The goal is to replace the currently required orthotropic WoÈhler curves with a WoÈhler curve for the matrix material. In investigations on pure resin samples it could be shown that the strength of these pure resin samples, corresponded to the matrix range of the numerical simulations of the RVE systems. Keywords: Continuous carbon fiber reinforced plastic (CFRP); representative volume elements (RVE); symmetrical and random fiber distributions Keywords: Continuous carbon fiber reinforced plastic (CFRP); representative volume elements (RVE); symmetrical and random fiber distributions The paper presents the research at the AG BMFT in cooperation with Rheinmetall Landsysteme GmbH focuses on the development a fatigue strength assessment workflow for strength design of highly loaded structures made of continuous carbon fiber reinforced plastic (CFRP) for o ff -road vehicles. A CFRP component with good fatigue properties consists of multiple unidirectional layers that have a thickness, fiber orientation, and fiber volume fraction. The fatigue strength evaluation takes place layer by layer and requires the material parameters of the unidirectional layer as input variables. To determine these input variables numerically, representative volume elements (RVE) are used and implemented in ABAQUS ® . The RVE systems are constructed with periodic boundary conditions calculate the homogenized e ff ective material properties from the heterogeneous material components of fiber and matrix. To illustrate the e ff ect of fiber distribution in the RVE space on the homogenized material parameters of the unidirectional layer, the RVE- systems are built with symmetric fiber arrays and with fiber distribution algorithms. The paper presents the research at the AG BMFT in cooperation with Rheinmetall Landsysteme GmbH focuses on the development a fatigue strength assessment workflow for strength design of highly loaded structures made of continuous carbon fiber reinforced plastic (CFRP) for o ff -road vehicles. A CFRP component with good fatigue properties consists of multiple unidirectional layers that have a thickness, fiber orientation, and fiber volume fraction. The fatigue strength evaluation takes place layer by layer and requires the material parameters of the unidirectional layer as input variables. To determine these input variables numerically, representative volume elements (RVE) are used and implemented in ABAQUS ® . The RVE systems are constructed with periodic boundary conditions calculate the homogenized e ff ective material properties from the heterogeneous material components of fiber and matrix. To illustrate the e ff ect of fiber distribution in the RVE space on the homogenized material parameters of the unidirectional layer, the RVE- systems are built with symmetric fiber arrays and with fiber distribution algorithms. Fatigue Design 2021, 9th Edition of the International Conference on Fatigue Design Fatigue Design 2021, 9th Edition of the International Conference on Fatigue Design Numerical calculation of homogenized e ff ective material properties of the single layer over arbitrary fiber distributions S. Spanke a , Dr.-Ing. H. Haensel a , Dr.-Ing. J. HoÈhbusch a , Prof. Dr.-Ing. J. Scholten a, ∗ a Workgroup Construction Machinery and Materials Handling (AG BMFT), Ruhr-University Bochum, Germany Numerical calculation of homogenized e ff ective material properties of the single layer over arbitrary fiber distributions S. Spanke a , Dr.-Ing. H. Haensel a , Dr.-Ing. J. HoÈhbusch a , Prof. Dr.-Ing. J. Scholten a, ∗ a Workgroup Construction Machinery and Materials Handling (AG BMFT), Ruhr-University Bochum, Germany Abstract Abstract 1. Introduction 1. Introduction

∗ Corresponding author. Tel.: + 49 234 32-28723 ; fax: + 49 234 32-14161. E-mail address: sekretariat@bmft.rub.de ∗ Corresponding author. Tel.: + 49 234 32-28723 ; fax: + 49 234 32-14161. E-mail address: sekretariat@bmft.rub.de

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2021 Organizers 10.1016/j.prostr.2022.03.023 2210-7843 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https: // creativecommons.org / licenses / by-nc-nd / 4.0) Peer-review under responsi bility of the scientific committee of the Fatigue Design 2021 Organizers . 2210-7843 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https: // creativecommons.org / licenses / by-nc-nd / 4.0) Peer-review under responsi bility of the scientific committee of the Fatigue Design 2021 Organizers .