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Proceedings Paper

Development of a shape memory polymer fastening system
Author(s): Kristin Cable; Jason Hermiller; Brandon Kirby; Matthew Sunday
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Paper Abstract

Traditional fastening systems exhibit various limitations that a next-generation shape memory polymer (SMP) system can overcome. Bolts and screws provide high-strength attachment but require permanent modification to the system and are typically visible, depending on the configuration. Adhesive bonding can provide high-strength attachment and low visibility, but it is irreversible. Hook and loop fasteners offer reversibility, but the fastened strength and the removal force are similar, limiting the applications. The unique properties of SMP enable a fastening system that offers advantages not currently available in any one fastening system, including reversibility, low visibility, and high-strength attachment. Cornerstone Research Group (CRG) designed a fastener system that consists of an array of SMP heads and stems that interlock. The high modulus of the SMP at room temperature provides rigid attachment, keeping the system interlocked. When activated above the glass transition temperature (Tg), the heads and stems become soft and flexible, reducing the force required during attachment and detachment of the system. The shape memory property of the SMP ensures all heads and stems return to their original position to allow proper alignment. The developed system provides shear and tensile strength in excess of 300 psi with tensile detachment requiring only 2 psi. The material selection, design, testing, and optimization of the SMP fastening system are discussed.

Paper Details

Date Published: 31 March 2009
PDF: 11 pages
Proc. SPIE 7290, Industrial and Commercial Applications of Smart Structures Technologies 2009, 72900J (31 March 2009); doi: 10.1117/12.815376
Show Author Affiliations
Kristin Cable, Cornerstone Research Group, Inc. (United States)
Jason Hermiller, Cornerstone Research Group, Inc. (United States)
Brandon Kirby, Cornerstone Research Group, Inc. (United States)
Matthew Sunday, Cornerstone Research Group, Inc. (United States)

Published in SPIE Proceedings Vol. 7290:
Industrial and Commercial Applications of Smart Structures Technologies 2009
Benjamin K. Henderson; M. Brett McMickell, Editor(s)

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