The effects of thermal cycling on the thermal deformation of graphite-polyimideThe effects of repetitive thermal cycling on the thermal deformation of graphite-fiber-reinforced polyimide laminates are investigated. Unsymmetric and unidirectional laminate specimens were cycled in an oven between room temperature and 180 or 315 C five times, and temperature and deformation were recorded as a function of time in order to measure thermal deformation. The results of the lower temperature cycling reveal a hysteresis-like effect in the temperature-thermal deformation relation for a single cycle, while no differences are detected from one cycle to the next. The response of an eight-layer curved specimen is found to agree well with predictions based on a piecewise-linear lamination theory, however, four-layer laminate response could not be explained. The results of the high-temperature tests also indicate a dependence of the strain on whether the specimen was being heated or cooled, however quantitative results are considered unreliable, due to strain gage difficulties.
Document ID
19800026040
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hyer, M. W. (Old Dominion Univ. Norfolk, VA, United States)
Hagaman, J. A. (Old Dominion University Norfolk, Va., United States)
Date Acquired
August 10, 2013
Publication Date
May 1, 1979
Subject Category
Composite Materials
Meeting Information
Meeting: Spring Meeting
Location: San Francisco, CA
Start Date: May 20, 1979
End Date: May 25, 1979
Sponsors: Society for Experimental Stress Analysis