El Saed, Tamer and Gurses, Ercan and Amir, Muhammad (2012) A phenomenological two-phase constitutive model for porous shape memor alloys. Computational Materials Science, 60. pp. 44-52. ISSN 0927-0256 (In Press)Full text not available in this repository. (Request a copy from the Strathclyde author)
We present a two-phase constitutive model for pseudoelastoplastic behavior of porous shape memory alloys (SMAs). The model consists of a dense SMA phase and a porous plasticity phase. The overall response of the porous SMA is obtained by a weighted average of responses of individual phases. Based on the chosen constitutive model parameters, the model incorporates the pseudoelastic and pseudoplastic behavior simultaneously (commonly reported for porous SMAs) as well as sequentially (i.e. dense SMAs; pseudoelastic deformation followed by the pseudoplastic deformation until failure). The presented model also incorporates failure due to the deviatoric (shear band formation) and volumetric (void growth and coalescence) plastic deformation. The model is calibrated by representative volume elements (RVEs) with different sizes of spherical voids that are solved by unit cell finite element calculations. The overall response of the model is tested against experimental results from literature. Finally, application of the presented constitutive model has been presented by performing finite element simulations of the deformation and failure in unaixial dog-bone shaped specimen and compact tension (CT) test specimen. Results show a good agreement with the experimental data reported in the literature.
|Keywords:||pseudoelastoplastic behavior , porous shape memory alloys , pseudoelastic deformation, Engineering design, Physics and Astronomy(all), Mechanics of Materials, Materials Science(all), Computational Mathematics, Chemistry(all), Computer Science(all)|
|Subjects:||Technology > Engineering (General). Civil engineering (General) > Engineering design|
|Department:||Faculty of Engineering > Design, Manufacture and Engineering Management|
|Depositing user:||Pure Administrator|
|Date Deposited:||21 Jun 2012 15:37|
|Last modified:||22 Mar 2017 11:58|