Title: Crack growth analysis of room temperature rolled (RTR) 6351 Al alloys by XFEM

Authors: Rajwinder Singh

Addresses: School of Mechanical, Materials and Energy Engineering, Indian Institute of Technology Ropar, Rupnagar – 140001 Punjab, India

Abstract: In this paper, the crack growth simulations are performed using extended finite element method (XFEM) on bulk, 40% and 70% room temperature rolled (RTR) 6351 Al-alloy. The properties obtained through experimentation are used for crack growth analysis. The fracture energy obtained by Charpy impact test is used as crack growth criterion for elasto-plastic crack growth simulations. The micro-structural characterisation of bulk and RTR Al-alloy is examined through optical microscope. After 40% and 70% thickness reductions, the decrease in grain size of the alloy is observed through optical micrographs. An improvement in mechanical properties has been observed for RTR samples through tensile and Charpy impact testing. The goal of this paper is to compare the fracture behaviour of as received and RTR 6351 Al alloy because it has been observed that even high strength materials may fail when loaded below their normal strength because of presence of cracks.

Keywords: crack growth analysis; XFEM; extended FEM; finite element method; room temperature rolling; aluminium alloys; elastoplastic crack growth simulation; microstructure; fracture behaviour.

DOI: 10.1504/IJMMP.2015.072919

International Journal of Microstructure and Materials Properties, 2015 Vol.10 No.3/4, pp.239 - 258

Available online: 07 Nov 2015 *

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