Research Papers

Exploitation of Large Recoverable Deformations Using Weaved Shape Memory Alloy Wire-Based Sandwich Panel Configurations

[+] Author and Article Information
Ashish Mohan

Research and Development
Establishment (Engineers),
Defence R&D Organization,
Pune 411 015, India
e-mail: ashish_uor@rediffmail.com

Sivakumar M. Srinivasan

Department of Applied Mechanics,
Indian Institute of Technology Madras,
Chennai 600 036, India
e-mail: mssiva@iitm.ac.in

Makarand Joshi

Research and Development
Establishment (Engineers),
Defence R&D Organization,
Pune 411 015, India
e-mail: meenmak@hotmail.com

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received May 31, 2016; final manuscript received December 23, 2016; published online February 9, 2017. Assoc. Editor: Xi Chen.

J. Eng. Mater. Technol 139(2), 021014 (Feb 09, 2017) (5 pages) Paper No: MATS-16-1158; doi: 10.1115/1.4035765 History: Received May 31, 2016; Revised December 23, 2016

A new class of truss structure based on superelastic shape memory alloy (SMA) wire has been developed by weaving superelastic SMA wire through two perforated facesheets. A gap was maintained between the facesheets while weaving and the ends of wire forming the truss legs are anchored in each facesheet. The resulting structure has a modified pyramidal configuration and is capable of undergoing large recoverable deformations typical of superelastic SMA. A four-unit cell truss specimen has been tested under static load cycles to investigate the compressive response. The truss specimen underwent a hysteretic loop and demonstrated minimal permanent deformation closely resembling the behavior of bulk SMA. A finite element model of the truss was generated and the analysis results were compared with the experimental response. The present work is an attempt to demonstrate an SMA-based truss structure having energy absorption capabilities with minimum permanent deformation. These truss structures may be applied for damage mitigation in composites subjected to impact and blast loads.

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Fig. 1

Stress–strain curve of typical superelastic SMA

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Fig. 2

(a) Cross section with wire weaved through the two facesheets and (b) view at wire bend with cylindrical slot in the facesheet

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Fig. 3

(a) Top facesheet, (b) bottom facesheet, (c) cross-sectional view, and (d) SMA truss after fabrication

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Fig. 4

Test bed with specimen

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Fig. 5

(a) SMA wire elements and (b) finite element model of single cell truss

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Fig. 6

(a) Specimen under maximum deformation and (b) deflection contour

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Fig. 7

Comparison of load-deformation response between experimental and simulation results

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Fig. 8

Continuous static cycling of truss specimen for five cycles

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Fig. 9

Comparison between different height trusses for same percentage vertical deflection

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Fig. 10

Comparison of hysteresis loop area per unit deflection for different height trusses




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