PSI - Issue 56

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect ScienceDirect

Procedia Structural Integrity 56 (2024) 144–152 Structural Integrity Procedia 00 (2023) 000 – 000

www.elsevier.com/locate/procedia

2452-3216 © 2023 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 SIRAMM23 organizers 10.1016/j.prostr.2024.02.049 2452-3216 © 2023 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 SIRAMM23 organizers 2452-3216 © 2023 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 SIRAMM23 organizers © 2023 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 SIRAMM23 organizers Abstract The aim of this paper is to analyze the effect of increasing the wall thickness in injection molded short fiber reinforced polymer (SFRP) parts, focusing mainly on tensile strain and tensile strength, as these are the most used characteristics for structural analyses. The phenomena that makes this evaluation of interest has to do with the microstructure of SFRP injection molded parts and how the fibers get oriented along the flow direction at superficial depths with an increasingly less aligned structure down to the mid plane/surface. By increasing the injected part wall thickness the ratio between the thicknesses of highly oriented layers and poorly oriented layers decreases, thus the tensile properties of the material should suffer a decrease as well. In order to study the mentioned hypothesis two types of materials were tested, PPA GF33 and PPS GF40, dog-bone type specimens were cut at different angles to the flow direction from injection molded plates of 2 and 3 mm wall thickness values. The tensile strains were recoded using a video extensometer and material data was calibrated using Digimat MX reverse engineering module and Ansys properties homogenization tool and finite element solver. Keywords: wall thickness, composite materials, tensile tests 1. Introduction The widespread use of high-performance engineering thermoplastic materials in industry is pushing for increasingly higher demands in terms of performance, efficiency and costs. Especially, in the automotive sector short Structural Integrity and Reliability of Advanced Materials obtained trough Additive Manufacturing (SIRAMM23) Evaluation of wall thickness effect on tensile properties of injected short fiber reinforced polymers Dan Micota 1 *, Alexandru Isaincu 2 , Liviu Marsavina 3 , Lucian Rusu 4 1,3,4 Politehnica University of Timișoara, Department of Mechanics and Strength of Materials, Mihai Viteazul Blvd, No. 1, Timișoara 300222, Romania 2 Politehnica Uni versity of Timișoara, Department of Steel Structures and Structural Mechanics, Ioan Curea Str, No. 1, Timișoara 300224, Romania Abstract The aim of this paper is to analyze the effect of increasing the wall thickness in injection molded short fiber reinforced polymer (SFRP) parts, focusing mainly on tensile strain and tensile strength, as these are the most used characteristics for structural analyses. The phenomena that makes this evaluation of interest has to do with the microstructure of SFRP injection molded parts and how the fibers get oriented along the flow direction at superficial depths with an increasingly less aligned structure down to the mid plane/surface. By increasing the injected part wall thickness the ratio between the thicknesses of highly oriented layers and poorly oriented layers decreases, thus the tensile properties of the material should suffer a decrease as well. In order to study the mentioned hypothesis two types of materials were tested, PPA GF33 and PPS GF40, dog-bone type specimens were cut at different angles to the flow direction from injection molded plates of 2 and 3 mm wall thickness values. The tensile strains were recoded using a video extensometer and material data was calibrated using Digimat MX reverse engineering module and Ansys properties homogenization tool and finite element solver. Keywords: wall thickness, composite materials, tensile tests 1. Introduction The widespread use of high-performance engineering thermoplastic materials in industry is pushing for increasingly higher demands in terms of performance, efficiency and costs. Especially, in the automotive sector short Structural Integrity and Reliability of Advanced Materials obtained trough Additive Manufacturing (SIRAMM23) Evaluation of wall thickness effect on tensile properties of injected short fiber reinforced polymers Dan Micota 1 *, Alexandru Isaincu 2 , Liviu Marsavina 3 , Lucian Rusu 4 1,3,4 Politehnica University of Timișoara, Department of Mechanics and Strength of Materials, Mihai Viteazul Blvd, No. 1, Timișoara 300222, Romania 2 Politehnica Uni versity of Timișoara, Department of Steel Structures and Structural Mechanics, Ioan Curea Str, No. 1, Timișoara 300224, Romania * Corresponding author. Tel.:+4-074-001-5046;. E-mail address: dan.micota@student.upt.ro * Corresponding author. Tel.:+4-074-001-5046;. E-mail address: dan.micota@student.upt.ro