PSI - Issue 71

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ScienceDirect

Procedia Structural Integrity 71 (2025) 90–94

Keywords: Dynamic stress intensity factor; Mott’s theory; Effective surface energy. Abstract Dynamic fracture analysis of engineering materials is important for structural integrity. In this study, Mott’s equation of dynamic fracture is further modified by considering the crack velocity dependent effective surface energy of the material. The parameters of the fracture model are determined using the nonlinear best curve fit of the experimental data concerning dynamic stress intensity factor (DSIF) vs. crack velocity of the steel material (AISI 4340) reported in literature. The optimized parameters are also used to establish the relationship between DSIF and effective surface energy with crack tip velocity. At the end, these observations are justified in view of the results from literature. © 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 SICE 2024 organizers 5 th International Structural Integrity Conference and Exhibition (SICE 2024) Crack Velocity Dependent Dynamic Stress Intensity Factor of a Steel Material Arun K. Singh, Ayush Mayur, Nishchay Satdeve Department of Mechanical Engineering, VNIT Nagpur, Nagpur-440010, India

Nomenclature a

Crack length ( ) 1 . ms −

Crack velocity & Limiting crack velocity ( ) 1 . ms −

& l v v

respectively

D

A constant related to inertia of crack tip A constant related to the constant D

k

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 SICE 2024 organizers 10.1016/j.prostr.2025.08.013