On the effects of geometry, defects, and material asymmetry on the mechanical response of shape memory alloy cellular lattice structures

M. R. Karamooz Ravari, S. Nasr Esfahani, M. Taheri Andani, M. Kadkhodaei, A. Ghaei, H. Karaca, M. Elahinia

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

Shape memory alloy (such as NiTi) cellular lattice structures are a new class of advanced materials with many potential applications. The cost of fabrication of these structures however is high. It is therefore necessary to develop modeling methods to predict the functional behavior of these alloys before fabrication. The main aim of the present study is to assess the effects of geometry, microstructural imperfections and material asymmetric response of dense shape memory alloys on the mechanical response of cellular structures. To this end, several cellular and dense NiTi samples are fabricated using a selective laser melting process. Both cellular and dense specimens were tested in compression in order to obtain their stress-strain response. For modeling purposes, a three -dimensional (3D) constitutive model based on microplane theory which is able to describe the material asymmetry was employed. Five finite element models based on unit cell and multi-cell methods were generated to predict the mechanical response of cellular lattices. The results show the considerable effects of the microstructural imperfections on the mechanical response of the cellular lattice structures. The asymmetric material response of the bulk material also affects the mechanical response of the corresponding cellular structure.

Original languageEnglish
Article number025008
JournalSmart Materials and Structures
Volume25
Issue number2
DOIs
StatePublished - Jan 4 2016

Keywords

  • cellular lattice structures
  • constitutive model
  • material asymmetry
  • microplane theory
  • NiTi
  • selective laser melting
  • shape memory alloys

ASJC Scopus subject areas

  • Signal Processing
  • Civil and Structural Engineering
  • Atomic and Molecular Physics, and Optics
  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'On the effects of geometry, defects, and material asymmetry on the mechanical response of shape memory alloy cellular lattice structures'. Together they form a unique fingerprint.

Cite this