Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Intelligent Material"”.
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An investigation of the interfacial characteristics of nitinol fibers in a thermoset composite
A heightened interest in intelligent material systems has occurred in recent years due to their remarkable adaptive abilities. Intelligent materials systems, which contain sensors and actuators coupled by means of active control, frequently utilize composite materials as the skeletal structure. In …
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Experimental investigation and modeling of the electrostrictive relaxor ferroelectric lead magnesium niobate-lead titinate
Fundamental to the design of intelligent material systems and structures are the realization of attributes of the constitutive transducer materials—the sensors and actuators—and the ability to model the characteristics of these transducers. In this thesis, electromechanical behaviors of the …
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Design, fabrication, and calibration of an instrumented drop weight impact tester
… allowing it to be used in future tests involving intelligent material systems.
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The performance of nitinol shape memory alloy actuators embedded in thermoplastic composite material systems
Intelligent materials are a class of material systems usually consisting of a composite or hybrid material system with fibrous or distributed actuators, various sensors and a control system. One type of actuator being developed for intelligent material systems is made of nitinol or shape memory …
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Variational Modeling of Ionic Polymer-Based Structures
Ionomeric polymers are a promising class of intelligent material which exhibit electromechanical coupling similar to that of piezoelectric bimorphs. Ionomeric polymers are much more compliant than piezoelectric ceramics or polymers and have been shown to produce actuation strain on the order of 2\% …
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Structural Health Monitoring Using Multiple Piezoelectric Sensors and Actuators
… technique was developed at the Center for Intelligent Material Systems and Structures. It has been successfully implemented on several complex structures to detect incipient-type damage such as small cracks or loose connections. However, there are still some problems to be solved before …
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Theoretical modeling of the actuation mechanism in integrated induced strain actuator/substructure systems
… been integrated with conventional structural materials to serve as energy input devices or actuating elements in many engineering applications implementing intelligent material systems and structures concepts. In order to use the actuation mechanism produced by the integrated induced strain …
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The VT1 Shape Memory Alloy Heat Engine Design
The invention of shape memory alloys spurred a period of intense interest in the area of heat engines in the late 70's and early 80's. It was believed that these engines could use heat from low temperature sources such as solar heated water, geothermal hot water and rejected heat from conventional …
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Effects of temperature on the electrical impedance of piezoelectric elements
… technique, developed at the Center for Intelligent Material Systems and Structures, employs piezoelectric (PZT) materials for tracking the structural impedance to qualitatively identify damage. The mechanical impedance of a structure is a function of the structure's mass, stiffness, …
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Active control of sound transmission/radiation from elastic plates using multiple piezoelectric actuators
… was considered as the plant. Piezoceramic materials bonded to the surfaces of the plate or point force shakers were applied as control actuators. Both microphones in the radiated far-field and accelerometers located on the plate were considered as error sensors. In addition, distributed …
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Analysis of the sensing region of a PZT actuator-sensor
… structural health monitoring at the Center for Intelligent Material Systems and Structures (CIMSS) [1-3]. This new technique uses piezoceramic (PZT) patches as actuator-sensors to provide a low-power driven constant voltage dynamic excitation, and to record the modulated current flow through the …