Response of porous SMA: a micromechanical study
Journal Title: Frattura ed Integrità Strutturale - Year 2014, Vol 8, Issue 29
Abstract
Lately porous shape memory alloys (SMA) have attracted great interest as low weight materialscharacterized by high energy dissipation capability. In the present contribution a micromechanical study ofporous SMA is proposed, introducing the simplifying hypothesis of periodic distribution of voids. Themechanical response of the heterogeneous porous medium is derived by performing nonlinear finite elementmicromechanical analyses considering a typical repetitive unit cell made of a circular hole in a dense SMA matrixand prescribing suitable periodicity and continuity conditions. The constitutive behavior and the dissipationenergy capability of the porous Nitinol are examined for several porosity levels. Numerical applications areperformed in order to test the ability of the proposed procedure to well capture the overall behavior and the keyfeatures of the special heterogeneous material.
Authors and Affiliations
V. Sepe, S. Marfia, F. Auricchio
Keywords
Related Articles
- EP ID EP131740
- DOI 10.3221/IGF-ESIS.29.09
- Views 79
- Downloads 0
Failure prediction of T-peel adhesive joints by different cohesive laws and modelling approaches
In this work, Cohesive Zone Modelling (CZM) was used to simulate failure of T-peel bonded joints with 1.5mm thick adherends, respectively, bonded toghether with Loctite Multibond 330 adhesive. The fracture toughness and...
Experimental investigation on possible dependence of plastic zone size on specimen geometry
In this investigation the extent of the plastic zone size ahead of a crack-tip in single edge notched tension (SENT), compact tension (CT) specimens has been examined experimentally by micro-hardness technique and by ela...
Analisi termica per la valutazione del comportamento a fatica di provini soggetti a successive serie di carichi
Partendo dalla osservazione che provini precedentemente danneggiati hanno un limite di fatica differente (vedi Miner) viene esaminato il comportamento di un acciaio soggetto a serie di carichi affaticanti al fine di veri...
Structural mechanisms of formation of adiabatic shear bands
The paper focuses on the experimental and theoretical study of plastic deformation instability and localization in materials subjected to dynamic loading and high-velocity perforation. We investigate the behavior...
Surface crack growth in cylindrical hollow specimen subject to tension and torsion
The subject for studies is an aluminium cylindrical hollow specimen with external axial and part circumferential semi-elliptical surface crack undergoing fatigue loads. Both the optical microscope measurements an...