Thermal deformations and stresses in composite materialsResidual stresses are induced during curing in angle-ply laminates as a result of anisotropic thermal deformations of the variously oriented plies. Residual strains are measured experimentally using embedded strain gage techniques, and residual stresses are computed using orthotropic stress-strain relations. The results show that, for graphite and Kevlar laminates, residual stresses at room temperature are high enough to cause damage in the plies in the transverse to the fiber direction. It is also shown that residual stresses do not relax appreciably. The ply stacking sequence is found to have no effect on the magnitude of average residual stresses. Residual stresses and susceptibility to cracking during curing depend to a marked extent on ply layup.
Document ID
19810064192
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Daniel, I. M. (IIT Research Institute Chicago, IL, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1980
Subject Category
Structural Mechanics
Meeting Information
Meeting: International Conference on Thermal Stresses in Materials and Structures in Severe Thermal Environments