PSI - Issue 66

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 66 (2024) 167–174

8th International Conference on Crack Paths Prediction of the Dynamic Crack Path of Concrete Under Projectile Impact Loading Sobhan Pattajoshi a *, Sonalisa Ray b

a Civil Engineering Department, Indian Institute of Technology, Roorkee, India b Civil Engineering Department, Indian Institute of Technology, Roorkee, India

Abstract The Riedel, Hiermaier, and Thoma (RHT) model is a widely used concrete material model for analyzing impacts and explosive events involving high strain rates. Although the original RHT model provides reasonably accurate predictions for penetration depth, it has significant limitations in accurately capturing the dynamic tensile failure, particularly spalling damage and tensile cracking. Previous efforts to enhance the RHT model have concentrated on fine-tuning input parameters to better align with experimental data. This study introduces an innovative approach to address the deficiencies in the original RHT model concerning damage and dynamic crack paths in concrete under projectile impact. A more precise representation of concrete dynamic response, especially the tensile failure behaviour, is achieved by incorporating the exponential tensile crack softening model within a user-subroutine material model. The model validity is confirmed through single-element simulations. Furthermore, the numerical simulation algorithm is validated for a projectile penetration scenario. The tensile damage representation is improved as the overestimation of tensile strength is eliminated. Additionally, the prediction of dynamic crack paths is now consistent with observations from the existing experimental studies. Subsequent analysis revealed that the modification in the tensile failure critically affects crack propagation and stress wave behaviour in the concrete target. The numerical results verified that incorporating the enhanced model accurately describes the dynamic behaviour of concrete under projectile impact loading. © 2025 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 CP 2024 Organizers Keywords: Concrete slab ; projectile impact ; user subroutine ; tensile crack softening model ; dynamic crack path ; material modeling © 2025 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 CP 2024 Organizers

* Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: sobhan_p@ce.iitr.ac.in

2452-3216 © 2025 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 CP 2024 Organizers

2452-3216 © 2025 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 CP 2024 Organizers 10.1016/j.prostr.2024.11.067