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NIA Seminar by Hiroshi Asanuma |
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Date: November 4, 2005
Time: 10:30am
Location: NIA, Rm 137
Development of Sensitive/Active Structural Material Systems
Hiroshi Asanuma, Chiba University, Japan
A couple of new concepts and key technologies proposed and demonstrated by the speaker to realize metal and polymer based sensitive and/or active structural material systems to be useful for health monitoring, actuation, repair and other purposes will be briefly introduced. The main topics will be as follows: (1) Embedding an optical fiber in an aluminum and SiC fiber reinforced aluminum composites to use as a sensor for health monitoring, and also embedding a FBG sensor in an aluminum; (2) forming optical interference and loss type strain sensors in an epoxy matrix and a CFRP simply by embedding pre-notched optical fiber and fracture of it in them; (3) forming a multifunctional sensor in an aluminum for temperature and strain monitoring by embedding an oxidized nickel fiber (NiO/Ni composite fiber) in them; (4) fabricating an active laminate of CFRP (works as “bone” and “blood vessel”)/epoxy (insulator)/aluminum (“muscle”)/electrode (to apply voltage on CFRP) of which unidirectional actuation is realized by electrical resistance heating of carbon fiber in the CFRP layer and its curvature change can be monitored by measurement of electrical resistance change of the CFRP layer (works as “nerve”) or using the multiply fractured optical fiber (works as “nerve”) explained above; (5) fabricating active fiber-reinforced metals such as SiC/Al and SiC/Ni systems by laminating a reinforced layer with a unreinforced layer or by changing fiber aspect ratios to cause thermal deformation. In the case of SiC/Al composite, its actuation takes place in the fiber direction and is useful for making a light weight and active panel. In the case of SiC/Ni composite, actuation takes place up to beyond 1200K and is useful for making a high temperature actuator.
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