Experimental Methods

Meyer, Lothar; Pursche, Frank

doi:10.1016/b978-0-08-097781-2.00002-2

Cited by 2 publications

(1 citation statement)

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“…An increase in strain rate promotes the formation of localized shear bands, as shown in Figures 11b and 12a. The formation of localization bands is associated with the instability of the plastic flow process and is accompanied by changes in the structure of the alloy [38][39][40][41]. The susceptibility to adiabatic shear band formation is associated with the relatively high yield strength and low degree of strain hardening of the Ti-5Al-2.5Sn alloy.…”

Section: Discussionmentioning

confidence: 99%

Ductile Fracture of Titanium Alloys in the Dynamic Punch Test

Skripnyak,

Skripnyak

2024

Metals

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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.

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Section: Discussionmentioning

confidence: 99%