Indentation response of a NiTi shape memory alloy: modeling and experiments
Journal Title: Frattura ed Integrità Strutturale - Year 2012, Vol 6, Issue 21
Abstract
The indentation response of a pseudoelastic nickel-titanium based shape memory alloy (SMA) has been analyzed. Indentation tests have been carried out at room temperature using a spherical diamond tip and indentation loads in the range 50-500 mN in order to promote a large stress-induced transformation zone in the indentation region and, consequently, to avoid local effects due to microstructural variations. The measured load-displacement data have been analyzed to obtain information on the pseudoelastic response of the alloy. To aid this analysis numerical simulations were performed, by using a commercial finite element (FE) software code and a special constitutive model for SMAs, so as to understand better the microstructural evolution occurring during the indentation process. Finally, the FE model has been used to analyze the effects of temperature on the indentation response of the alloy. This analysis revealed a marked variation of both the maximum and residual penetration depths with increasing test temperature.
Authors and Affiliations
Carmine Maletta, Franco Furgiuele, E. Sgambiterra, M. Callisti, B. G. Mellor, R. J. K. Wood
Keywords
Related Articles
- EP ID EP103425
- DOI 10.3221/IGF-ESIS.21.01
- Views 66
- Downloads 0
Damage localization and rupture with gradient damage models
We propose a method of construction of non homogeneous solutions to the problem of traction of a bar made of an elastic-damaging material whose softening behavior is regularized by a gradient damage model. We show...
Computed Tomography analysis of damage in composites subjected to impact loading
The composites, used in the transportation engineering, include different classes with a wide range of materials and properties within each type. The following different typologies of composites have been investigated:...
A micropolar model for the analysis of dispersive wavesin chiral mass-in-mass lattices
The possibility of obtaining band gap structures in chiral auxetic lattices is here considered andapplied to the case of inertial locally resonant structures. These periodic materials are modelled as beam-latticesm...
Numerical simulation of dissimilar metal welding and its verification for determination of residual stresses
This paper summarizes the results of the through-thickness residual stress distributions on dissimilar metal weld (DMW) mock-up. DMWs, as welded joints between ferritic steels and either austenitic stainless stee...
An investigation on corrosion protection layers in pipelines transporting hydrocarbons
Chemical reactions between carbon steel, water and chemical species produce corrosion layers (scales) on the internal surface of pipelines transporting hydrocarbons. Scales act as a diffusion barrier and prevent...