State Equations and Thermodynamics of Hysteretic materials
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{'SignBlockName': 'Ritchie B. Coryell', 'PO_EMAI': None, 'PO_PHON': None}
Engineering design is severely limited with shape memory alloys                 by the lack of a simple, self-consistent set of predictive                      equations.  Such a set of predictive equations have been derived                and tested for the shape memory alloy, Nitinol.  This theory has                two parts: 1) a state equation, which uniquely and completely                   relates stress, strain and temperature using 6 material specific                coefficients; and 2) a thermodynamics which relates the                         mechanical behavior (state equation) to the heat flow properties.               The state equation description of mechanical behavior has been                  thoroughly tested.  Preliminary tests indicate the same form of                 equation applies to electrets and other hysteretic materials.                   The thermodynamic predictions have not yet been tested by                       subsequent measurements.  The Phase I research is to test the                   thermodynamics.  The Phase II research will use the theory to                   study Nitinol fatigue, refine the form of the state equations,                  and apply the theory to other hysteretic materials.
{'FirstName': 'J.', 'LastName': 'Cory', 'PI_MID_INIT': 'S', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'J. S Cory', 'EmailAddress': None, 'PI_PHON': None, 'NSF_ID': '000407586', 'StartDate': '02/01/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
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{'Code': '5371', 'Text': 'SBIR Phase I'}
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