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Journal of Applied Physics / Volume 108 / Issue 9 / ARTICLES / Structural, Mechanical, Thermodynamic, and Optical Properties of Condensed Matter

J. Appl. Phys. 108, 093512 (2010); http://dx.doi.org/10.1063/1.3499351 (5 pages)

Autonomous materials with controlled toughening and healing

Michael E. Garcia, Yirong Lin, and Henry A. Sodano

Schools of Mechanical, Aerospace, Chemical, and Materials Engineering, Arizona State University, 501 E Tyler Mall ERC 303 Tempe, Arizona 85287, USA

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(Received 28 July 2010; accepted 2 September 2010; published online 9 November 2010)

Biological systems exhibit many advanced sensory and healing traits that can be applied to the design of modern material systems. The foremost goal for the development of future adaptive structures is to provide materials capable of autonomously adapting in order to impede damage progression and, subsequently, heal the damaged region. Here, a novel autonomous material system is devised using shape memory polymers (SMPs), which employ a fiber optic network, functioning both as a damage detection sensor and thermal stimulus delivery system. This system mimics the advanced sensory system as well as toughening and healing mechanisms found in human bones. By incorporating both methods into this material, the resulting autonomous system is able to increase toughness by 11 times over the original material. In addition to toughening, the shape memory effect can be used to close the crack and upon reloading of the toughened SMP specimen to failure, the system demonstrates a 96% strength recovery of the virgin strength. Following crack closure the new material system has 4.9 times more toughness than the un-toughened specimen even through it has been strained four times past its virgin failure strain.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL METHODS
    1. SMP synthesis and design
    2. Photothermal laser system for autonomous control
    3. Mechanical testing methods
  3. RESULTS AND DISCUSSION
    1. Active toughening
    2. Shape memory healing-crack closure effect
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

biomedical materials, fibre optic sensors, optical fibres, polymers, shape memory effects

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3499351

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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