Finite Element Analysis of Stress Evolution in Al-Si Alloy

Joseph, Sudha and Kumar, S (2015) Finite Element Analysis of Stress Evolution in Al-Si Alloy. In: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 24 (1). pp. 253-260.

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Abstract

A 2D multi-particle model is carried out to understand the effect of microstructural variations and loading conditions on the stress evolution in Al-Si alloy under compression. A total of six parameters are varied to create 26 idealized microstructures: particle size, shape, orientation, matrix temper, strain rate, and temperature. The effect of these parameters is investigated to understand the fracture of Si particles and the yielding of Al matrix. The Si particles are modeled as a linear elastic solid and the Al matrix is modeled as an elasto-plastic solid. The results of the study demonstrate that the increase in particle size decreases the yield strength of the alloy. The particles with high aspect ratio and oriented at 0A degrees and 90A degrees to the loading axis show higher stress values. This implies that the particle shape and orientation are dominant factors in controlling particle fracture. The heat treatment of the alloy is found to increase the stress levels of both particles and matrix. Stress calculations also show that higher particle fracture and matrix yielding is expected at higher strain rate deformation. Particle fracture decreases with increase in temperature and the Al matrix plays an important role in controlling the properties of the alloy at higher temperatures. Further, this strain rate and temperature dependence is more pronounced in the heat-treated microstructure. These predictions are consistent with the experimentally observed Si particle fracture in real microstructure.

Item Type:	Journal Article
Publication:	JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Publisher:	SPRINGER
Additional Information:	Copy right for this article belongs to the SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Keywords:	Al-Si alloy; heat treatment; finite element modeling; fracture; Si particle morphology; stress analysis
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	06 Feb 2015 14:36
Last Modified:	06 Feb 2015 14:36
URI:	http://eprints.iisc.ac.in/id/eprint/50769

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