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Self-healing autonomous material comes to life

Date:
December 7, 2010
Source:
American Institute of Physics
Summary:
Researchers have created a material that may be able to sense and heal damage, such as cracking in a fiber reinforced composite. The aim of developing "autonomous adaptive structures" is to mimic the ability of biological systems such as bone to sense the presence of damage, halt its progression and regenerate itself.

Thermal image capturing the temperature gradient created by the photo-thermal heating method.
Credit: Image courtesy of American Institute of Physics

You've seen it in movies: the human-like, robot assassin quickly regenerates its structure after being damaged beyond recognition. This "Terminator" scenario is becoming less far-fetched as recent advances in structural health monitoring systems have led to a variety of ways to identify damage to a structural system.

Now, in the Journal of Applied Physics, researchers at Arizona State University have created a material that may be able to not only sense damage in structural materials, such as cracking in a fiber-reinforced composite, but to even heal it. The aim of developing "autonomous adaptive structures" is to mimic the ability of biological systems such as bone to sense the presence of damage, halt its progression, and regenerate itself.

The novel autonomous material developed by Henry Sodano and colleagues uses "shape-memory" polymers with an embedded fiber-optic network that functions as both the damage detection sensor and thermal stimulus delivery system to produce a response that mimics the advanced sensory and healing traits shown in biological systems. An infrared laser transmits light through the fiber-optic system to locally heat the material, stimulating the toughening and healing mechanisms.

The material system is capable of increasing the toughness of a specimen by 11 times. After toughening the specimen, the crack can be closed using the shape-memory effect to recover an unprecedented 96 percent of the object's original strength. In fact, after the crack is closed, the new material is nearly five times as tough as the original specimen, even though it has been strained past its original failure strain point by a factor of four. The material and healing process can be applied while the structure is in operation, which has not been possible with existing healing techniques.


Story Source:

The above story is based on materials provided by American Institute of Physics. Note: Materials may be edited for content and length.


Journal Reference:

  1. Michael E. Garcia, Yirong Lin, Henry A. Sodano. Autonomous materials with controlled toughening and healing. Journal of Applied Physics, 2010; 108 (9): 093512 DOI: 10.1063/1.3499351

Cite This Page:

American Institute of Physics. "Self-healing autonomous material comes to life." ScienceDaily. ScienceDaily, 7 December 2010. <www.sciencedaily.com/releases/2010/12/101207091813.htm>.
American Institute of Physics. (2010, December 7). Self-healing autonomous material comes to life. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2010/12/101207091813.htm
American Institute of Physics. "Self-healing autonomous material comes to life." ScienceDaily. www.sciencedaily.com/releases/2010/12/101207091813.htm (accessed July 22, 2014).

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