Thermomechanical behavior of multidirectional composite laminates

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1990

OSTI ID:5632371

Wang, Taoming

Several studies are reported including results of a fully elastic characterization and analysis of woven-glass/epoxy materials; determination of irreversible chemical shrinkage; accelerated viscoelastic characterization; linear thermoviscoelastic analysis under nonisothermal conditions; and effects of processing parameters. The ultimate objective is to characterize and predict warpage as a function of material, processing, and environmental parameters. Both linear thermoelastic and thermoviscoelastic lamination theory were used to determine the state of residual and warpage in multilayer structures following elevated temperature curing. The time- and temperature-dependent properties of the single uni-directional layer of the material was characterized by means of an accelerated procedure for the viscoelastic analysis. Residual stresses and warpage were numerically evaluated, taking into consideration the irreversible polymerization shrinkage and boundary conditions during and after curing. Warpage was measured experimentally for (O{sub 6}/90{sub 6}) and (O{sub 11}/30) laminates by means of the shadow moire method. Results were in good agreement with the theoretical predictions of viscoelastic analysis.

• Research Organization: Northwestern Univ., Evanston, IL (United States)
• OSTI ID: 5632371
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
360603* -- Materials-- Properties
COMPOSITE MATERIALS
CURING
DEFORMATION
ELASTICITY
EPOXIDES
FABRICATION
GLASS
HEAT TREATMENTS
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
STRESS ANALYSIS
TENSILE PROPERTIES
THERMOMECHANICAL TREATMENTS