Residual thermal stresses in filamentary polymer-matrix composites containing an elastomeric interphase
- Mississippi State Univ., Mississippi State (United States) Mississippi Univ., University (United States)
A three-phase micromechanical model based on the method of cells is formulated to characterize residual thermal stresses in filamentary composites containing an interphase 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 thermal stresses in the fiber, interphase and matrix as a function of the interphase thickness and fiber volume fraction within each model eomposite. The study makes a broad assessment of the stress-attenuating characteristics that each interphase imparts to the graphite/epoxy composites. Over the range of variables considered, properly dimensioning the elastomer interphase leads to a more favorable reduction of residual thermal stress. 38 refs.
- OSTI ID:
- 6253566
- Journal Information:
- Journal of Composite Materials; (United States), Vol. 27:8; ISSN 0021-9983
- Country of Publication:
- United States
- Language:
- English
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