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

Authors

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

Abstract

In this article, the effect of stress triaxiality and Lode angle on the ductility of titanium grade 2 alloy has been investigated. For this research, four samples with different geometries, including Dog-bone samples, notched samples, and two shear samples, were designed and manufactured. A uniaxial tensile test at ambient temperature was performed on these samples. A Dog-bone sample was used to extract the mechanical properties of titanium alloy. The simulations were done 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, Swift's combined equation and fourth-order polynomial were used. Comparing the results of experimental tests and simulation with Abaqus shows a good agreement between the diagrams up to the end of the plastic zone. In this research, the stress triaxiality varied between zero and 0.5 for four different samples. Specifically, for one of the triaxial shear samples, the stress value was zero, and for the other shear sample, 0.2. Also, the stress triaxiality for Dog-bone and notched sample was recorded as 0.33 and 0.5 respectively.

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References

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

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