Thermomechanical response of SMA composite beams with embedded nitinol wires in an epoxy matrix

S. R. White, J. B. Herman

Research output: Contribution to journalConference articlepeer-review


Nitinol shape memory wires were embedded in epoxy beams to study their thermomechanical behavior in the embedded state. Beams were made with ten wires placed below the geometric mid-plane. A room temperature cure epoxy was used to minimize residual stresses acting on the wires. The beams were placed in an oven and heated from room temperature to a temperature well above the austenitic finish temperature of the wires. The beams were photographed through a window in the oven door at periodic intervals during the experiment. The photographs were analyzed to measure beam deflections during the experiment resulting from thermal and shape memory transformational strains. A beam model was developed and predictions of beam curvature were compared to the experimental data. The results show that agreement between the model and the experimental data is dependent, and extremely sensitive to, an accurate knowledge of the thermomechanical properties of both the nitinol and epoxy phases. Large deflections of the beams were obtained and some evidence of a transformation front propagation from the edges to the center of the beam is shown.

Original languageEnglish (US)
Pages (from-to)391-400
Number of pages10
JournalJournal of Intelligent Material Systems and Structures
Issue number5
StatePublished - 1998
Externally publishedYes
EventProceedings of the 1997 Symposium on Active Materials at McNU-97,the Joint American Society for Mechanical Engineering (ASME) American Society of Civil Engineers(ASCE)/Society of Engineering Sciences(SES) - Evanston, IL, USA
Duration: Jun 29 1997Jul 2 1997

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering


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