Experimental and numerical analysis of the effect of stress triaxiality and lode angle on ductile failure of Ti-6Al-4V alloy

Document Type : Research Article

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Faculty of Mechanical Engineering, University of Tehran, Tehran, Iran

Abstract

In this article, the effect of stress triaxiality and Lode angle for titanium alloy has been investigated. Four samples with different geometries including dog-bone, notched and two shear samples were made. Uniaxial tensile test at ambient temperature was performed on all samples. Using a dog-bone sample, the mechanical properties of grade two titanium alloy were extracted under tensile loading. The samples were simulated in ABAQUS software and the failure behavior of the samples was analyzed until the end of the plastic zone. To match the force-displacement diagrams of the samples, Swift's combined equation and the fourth-order polynomial for the hardening of the material have been used. The results of experimental tests and simulation with ABAQUS were compared and a good agreement between the force-displacement diagrams up to the end of the plastic zone was observed. For the mentioned four samples, the stress triaxiality between 0 and 0.5 has been obtained numerically. The results show that the closer the stress triaxiality is to zero, the failure of the samples in the experimental tests has occurred in shear. In addition, by examining the results, it can be seen that the in-crease of the stress triaxiality with the change of the Lode angle is not uniform and has changed in an increasing and decreasing manner. As a result, these changes also affect the failure strain of the samples.

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Amirkabir Journal of Mechanical Engineering
Volume 56, Issue 6
September 2024
Pages 791-810

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