Accession Number : ADA531958


Title :   Two-Scale Modelling of Effects of Microstructure and Thermomechanical Properties on Dynamic Performance of an Aluminium Alloy


Descriptive Note : Journal article


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE


Personal Author(s) : Clayton, J D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a531958.pdf


Report Date : Sep 2010


Pagination or Media Count : 32


Abstract : Influences of microstructure and properties of an aluminium alloy on resistance to dynamic perforation are predicted using a decoupled multi-scale modelling approach. At the scale of individual grains, a crystal plasticity model is developed accounting for finite elastic and plastic deformations, thermal softening and energy storage mechanisms linked to microscopic residual stress fields induced by line defects and second-phase particles. An averaging scheme is invoked to compute macroscopic stress-deformation responses corresponding to various microstructures. The results of the averaging process motivate choices of parameters entering a macroscopic plasticity model, with different parameter sets corresponding to different microstructures. This macroscopic model, with various parameter sets, is in turn used to simulate impact and perforation of a thin plate of the aluminium alloy by a cylindrical projectile. The results provide quantitative assessments of possible benefits of texturing, insertion of strengthening and energy storage mechanisms and enhancement of ductility on performance of the alloy.


Descriptors :   *MICROSTRUCTURE , *ALUMINUM ALLOYS , *MECHANICAL PROPERTIES , *THERMAL PROPERTIES , ENERGY STORAGE , BALLISTICS , TEXTURE , REPRINTS , RESIDUAL STRESS , PLASTIC DEFORMATION


Subject Categories : Metallurgy and Metallography
      Properties of Metals and Alloys


Distribution Statement : APPROVED FOR PUBLIC RELEASE