In recent years, the development of AlSi10Mg alloy using additive manufacturing technology has been increasing due to its super mechanical properties compared to alloys prepared through conventional casting route. The unique microstructural features in terms of grain morphology, texture, reduced porosity contents, and residual stress are controlled through precise control of laser processing parameters and build parameters in the additive manufacturing route. The high-speed impact behavior of additively manufactured AlSi10Mg alloy can be studied by using Ballistic impact phenomenon with implementation of FEM (Finite Element Method). Ballistic perforation accounts for strain hardening, strain rate effects, thermal softening etc. by adjusting the yield stress. The parallel development of the mechanics of penetration and perforation of projectiles into targets has contributed to ballistic research. To date, this penetration mechanics has experienced a growing number of non-military applications, especially its industrial application, such as mining and construction technology, the spacecraft’s defensive design i.e., the design of sacrificial shields against space debris, the integrity of nuclear reactor pressure vessels, spinning machinery and survival of aircraft turbine blades. Johnson-Cook model is the most widely used model to simulate metallic materials’ impact behavior by using FEM. It only requires few tensile tests to determine five material model parameters. There is no reported literature so far on Johnson-Cook damage model for additively manufactured AlSi10Mg alloy for ballistic impact.
The present work investigates impact behaviour of additively manufactured AlSi10Mg alloy and ballistic limit of projectiles using FEM simulations. Tensile tests, dynamic tests and elevated temperature tensile tests simulations were performed on smooth and notched specimens to calculate Johnson-Cook material and damage model parameters, which are subsequently given as inputs for impact simulation. The relationship between residual velocity versus initial projectile velocity is expressed using Jonas-Lambert’s model for calculating ballistic limit. A comparison between hemispherical, blunt and conical nose shape projectile on impact behaviour and the effect of thickness of the plate on ballistic limits are systematically studied in the present work.