PSI - Issue 60

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

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ScienceDirect

Procedia Structural Integrity 60 (2024) 185–194

© 2024 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 ICONS 2023 Organizers Abstract Super-austenitic stainless steel is a class of high alloy steels with enhanced toughness, outstanding strength, and corrosion resistance. In this article, the structural integrity of super-austenitic stainless steel square sandwich panels subjected to surface and underwater explosions is investigated through numerical simulations, and the results are validated with experiments. Abaqus Explicit Solver is used to predict the face deformation and core crushing failure modes of the sandwich panels. Simulations are performed for three levels of impulse load by varying the explosive quantity. The fluid-structure interaction is established by CONWEP and UNDEX algorithms for air blasts and underwater explosions respectively. The dynamic deformation behavior of the sandwich panel is modeled using the Johnson-Cook (JC) plasticity model incorporating strain rate and temperature effects. Good agreement is witnessed between the numerical predictions and experimental observations. An increment in deformation of the face sheet, cell wall buckling, and core compaction is observed with the increase in the impulse. From a series of air and underwater explosion simulations, the advantage of using sandwich structures for blast mitigation is demonstrated. In addition, the significance of numerical simulations to limit experiments and predict the deformation of the sandwich panels is presented. © 2024 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 ICONS 2023 Organizers Keywords: Abaqus CAE; honeycomb sandwich; air blast; underwater explosion; deformation prediction 1. Introduction Protective structures must ensure the survivability of assets from surface and underwater explosions. Sandwich structures are widely preferred in this case to mitigate the blast impulse characterized by high strain rate localized loading [1,2]. Field experiments and numerical simulations have been conducted by researchers to understand the effects of highly intense dynamic loads of a surface and underwater blast on various structures [3-8]. Third International Conference on Structural Integrity 2023 (ICONS 2023) Deformation behavior of super-austenitic stainless steel sandwich panels subjected to air blast and underwater explosion Prince Jeya Lal Lazar a , Anupoju Rajeev b* a Department of Mechanical Engineering, Rajalakshmi Institute of Technology, Chennai, Tamil Nadu 600124, India, b Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Maharashtra 400076, India, * dranupojurajeev@gmail.com

2452-3216© 2024 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 ICONS 2023 Organizers

2452-3216 © 2024 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 ICONS 2023 Organizers 10.1016/j.prostr.2024.05.040