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Residual stresses and their effects in composite laminatesResidual stresses in composite laminates are caused by the anisotropy in expansional properties of constituent unidirectional plies. The effect of these residual stresses on dimensional stability is studied through the warping of unsymmetric (0 sub 4/90 sub 4)sub T graphite/epoxy laminates while their effect on ply failure is analyzed for (0/90)sub 2s Kevlar 49/epoxy laminate. The classical laminated plate theory is used to predict the warping of small and large panels. The change of warping does not indicate a noticeable stress relaxation at 75 C while it is very sensitive to moisture content and hence to environment. A prolonged gellation at the initial cure temperature reduces residual stresses while postcure does not. The matrix/interface cracking in dry (0/90)sub 2s Kevlar 49/epoxy laminate is shown to be the result of the residual stress exceeding the transverse strength.
Document ID
19830062827
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hahn, H. T.
(Washington Univ. Saint Louis, MO, United States)
Hwang, D. G.
(Washington University St. Louis, MO, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
Composite Materials
Meeting Information
Meeting: Engineering science and mechanics; International Symposium
Location: Tainan
Country: China
Start Date: December 29, 1981
End Date: December 31, 1981
Accession Number
83A44045
Funding Number(s)
CONTRACT_GRANT: JPL-956011
Distribution Limits
Public
Copyright
Other

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