Residual Thermal Stresses in Filamentary Polymer-Matrix Composites Containing an Elastomeric Interphase

A three-phase micromechanical model based on the method of cells is for mulated to characterize residual thermal stresses in filamentary composites containing an in terphase between the fiber and the matrix. This is the first such study to incorporate a true three-phase version of the method of cell...

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Bibliographic Details
Published in:Journal of composite materials 1993-01, Vol.27 (8), p.830-860
Main Authors: Gardner, Steven D., Pittman, Charles U., Hackett, Robert M.
Format: Article
Language:English
Subjects:
360603 - Materials- Properties
Applied sciences
COMPOSITE MATERIALS
Composites
ELASTICITY
Elastomers
Exact sciences and technology
Fiber reinforced materials
Forms of application and semi-finished materials
MATERIALS
MATERIALS SCIENCE
MATHEMATICAL MODELS
MATRIX MATERIALS
MECHANICAL PROPERTIES
Mechanics
Polymer industry, paints, wood
RESIDUAL STRESSES
STRESS INTENSITY FACTORS
STRESSES
Technology of polymers
TENSILE PROPERTIES
Thermal stress
THERMAL STRESSES
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Summary:A three-phase micromechanical model based on the method of cells is for mulated to characterize residual thermal stresses in filamentary composites containing an in terphase between the fiber and the matrix. This is the first such study to incorporate a true three-phase version of the method of cells. The model's performance is critically evaluated using data generated from other micromechanical models. Subsequently, a parametric study is performed to quantify the residual stresses in two hypothetical graphite fiber/epoxy matrix composites: one containing an elastomeric interphase whose Young's modulus is less than that of the fiber and the matrix and one incorporating an interphase whose Young's modulus is intermediate with respect to the fiber and the matrix. The data correlate the residual ther mal stresses in the fiber, interphase and matrix as a function of the interphase thickness and fiber volume fraction within each model composite. The study makes a broad assessment of the stress-attenuating characteristics that each interphase imparts to the graphite/epoxy com posites. Over the range of variables considered, properly dimensioning the elastomer inter phase leads to a more favorable reduction of residual thermal stress.
ISSN:0021-9983
1530-793X
DOI:10.1177/002199839302700805