A comprehensive numerical study on high-velocity impact response of aluminum/titanium functionally graded composite materials

چکیده مقاله

Abstract

The numerical investigation of high-velocity impact on a functionally graded material (FGM) composed of two metallic phases by considering damage model in finite element simulation is done for the first time. In this study, the power-law function is used to determine the volume fraction of the metallic phases. Moreover, in order to consider the damage in the finite element model, Johnson-Cook’s damage model is utilized. Due to the widespread use of titanium Ti-6Al-4V alloy and aluminum AA5083-H116 alloy in different industries, these two alloys are used as the metallic phases in the FGM. The verification of the numerical model with an available experimental data shows that the percentage error is less than 2 % which indicates the good precision of the numerical model. The results of current research confirm that when the linear distribution (i.e., power-law with the exponent n=1) is established for the volume fraction distribution function, maximum energy absorption for the FGM is obtained. The reason is that when the exponent is taken equal to 1, there is a smother gradient for the mechanical properties along the thickness. Furthermore, comparing the data for the metallic FGM with two pure metals under the impact loading shows that the energy absorption capacity of the metallic FGM is always higher than that of the pure metal. This founding reveals the importance of property combination of two metallic alloys in a functionally graded form.

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