Adhesion of nickel-titanium shape memory alloy wires to polymeric materials: Theory and experiment

F. C. Antico, P. D. Zavattieri, L. G. Hector

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


This work presents an experimental and theoretical study intended to obtain a better understanding of adhesion between NiTi Shape Memory Alloy wire and Thermoplastic Polyolefin (TPO) matrix. NiTi wire surfaces were subject to different surface treatments (e.g. chemical, conversion coating and mechanical). Atomic force microscopy was employed to examine nanometer to micron-scale NiTi wire surface features resulting from each treatment. Experimental pull-out tests were performed to assess the adhesion. The degree to which the different treatments increased the pull-out force was quantified. Existing theoretical models of wire pull-out based upon strength of materials and linear elastic fracture mechanics approaches are evaluated and its extension to NiTi/TPO single wire composites is reviewed. Results from a finite element model (FEM), wherein the NiTi/TPO matrix interface is modeled with a cohesive model, suggest that the interface behavior strongly depends on the mode II properties rather than on the mode I properties during pull-out only if residual stresses from the manufacturing process are included. In addition, the FEM model is shown to properly account for the energy dissipation in the debonding front and the inelastic deformation in a NiTi wire during pull-out.

Original languageEnglish
Title of host publicationMaterials Properties, Characterization, and Modeling
PublisherMinerals, Metals and Materials Society
Number of pages14
ISBN (Print)9781118296097
StatePublished - 2012
Event141st Annual Meeting and Exhibition, TMS 2012 - Orlando, FL, United States
Duration: 11 Mar 201215 Mar 2012

Publication series

NameTMS Annual Meeting


Conference141st Annual Meeting and Exhibition, TMS 2012
Country/TerritoryUnited States
CityOrlando, FL


  • Adhesion
  • Cohesive zone model
  • NiTi pull-out tests
  • Residual stresses
  • Smart composites
  • Surface treatments


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