PSI - Issue 41

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect St ructural Integrity Procedia 00 (2022) 000 – 000

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ScienceDirect

Procedia Structural Integrity 41 (2022) 248–253

© 2022 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 MedFract2Guest Editors. Abstract The behavior of highly cross-linked epoxy resin subjected to varying strain rates is evaluated under uniaxial tension and compression. Under compression, where deformation is dominated by shear transformation zone-based shear yielding phenomenon, the elastic modulus, yield strength, and percentage softening post yielding increase as strain rate increases. Under tension, where deformation is dominated by local tensile stress-based crazing phenomenon, both the strain at fracture and fracture stress initially decrease up to a strain rate of 0.02 s -1 . Hereafter, as the strain rate increases to 0.2 s -1 , there is a slight increase in the tensile strain, and the tensile stress reaches the maximum values. This is attributed to a varying dominance of crazing mechanism from disentanglement to chain scission as strain rate is increased. © 2022 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 theMedFract2Guest Editors. Keywords: Epoxy; st rain rate; craze; tension; compression 1. Introduction The deformation of epoxy under uniaxia l compression can show four distinct regions on the stress -strain curve; an initia l linear elastic and progressively non-linear elastic region followed by a softening region post yielding and finally a re -hardening stage (Nguyen et al., 2016; Srivastava, 2010). The good repeatability of results obtained in the stress initially decrease up to a strain rate of 0.02 s -1 . Hereafter, as the strain rate increases to 0.2 s -1 the tensile This is an open access artic 2nd Mediterranean Conference on Fracture and Structural Integrity Effect of strain rate on the uni-axial stress-strain behavior of highly cross-linked epoxy resin Kushal Mishra a,b,c , Aparna Singh b * a IITB-Monash ResearchAcademy, IIT Bombay, Mumbai – 400076, India b Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology, Bombay,Mumbai – 400076, India Department of Materials ScienceandEngineering, MonashUniversity, Clayton, VIC 3800, Australia Kushal Mishra , Aparna Singh *

* Corresponding author. Tel.: +91-22-2576-7605 E-mail address: aparna_s@iitb.ac.in

2452-3216 ©2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CCBY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-reviewunder responsibility of the MedFract2Guest Editors. 2452-3216

2452-3216 © 2022 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 MedFract2Guest Editors. 10.1016/j.prostr.2022.05.028