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Ductile Fracture of Titanium Alloys in the Dynamic Punch Test

Authors :
Vladimir V. Skripnyak
Vladimir A. Skripnyak
Source :
Metals, Vol 14, Iss 5, p 528 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

Estimates of physical and mechanical characteristics of materials at high strain rates play a key role in enhancing the accuracy of prediction of the stress–strain state of structures operating in extreme conditions. This article presents the results of a combined experimental–numerical study on the mechanical response of a thin-sheet rolled Ti-5Al-2.5Sn alloy to dynamic penetration. A specimen of a titanium alloy plate underwent punching with a hemispherical indenter at loading rates of 10, 5, 1, and 0.5 m/s. The evolution of the rear surface of specimens and crack configuration during deformation were observed by means of high-speed photography. Numerical simulations were performed to evaluate stress distribution in a titanium plate under specified loading conditions. To describe the constitutive behavior and fracture of the Ti-5Al-2.5Sn alloy at moderate strain rates, a physical-based viscoplastic material model and damage nucleation and growth relations were adopted in the computational model. The results of simulations confirm a biaxial stress state in the center of specimens prior to fracture initiation. The crack shapes and plate deflections obtained in the calculations are similar to those observed in experiments during dynamic punching.

Details

Language :
English
ISSN :
14050528 and 20754701
Volume :
14
Issue :
5
Database :
Directory of Open Access Journals
Journal :
Metals
Publication Type :
Academic Journal
Accession number :
edsdoj.937d6e0662b4f85b7a63017ff20e99a
Document Type :
article
Full Text :
https://doi.org/10.3390/met14050528