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me508lecture5 - XI. Structural Composite Systems A. General...

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XI. Structural Composite Systems A. General Comments Relevant facts and engineering properties of some man-made reinforced material which are becoming common in structural applications are noted in the following paragraphs/slides. These composites involve combinations of reinforcement and matrix constituents discussed previously. For the most part, the following discussion involves unidirectionally reinforced single plies . As such, the material becomes mechanically
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XI. Structural Composite Systems (cont’d) The mechanical anisotropy presents the subsequent need to pursue anisotropic elasticity . That employed composites are frequently bonded laminates of individual plies necessitates the need to study lamination theory for structural analysis. For design and analysis purposes, and because composites are directionally dependent and stacked laminates, strength theories (or failure criteria) take on added complexity. Similarly, the anisotropy and heterogeneity of composites complicates the picture with respect to fatigue and fracture . The high dependence of gross composite response on individual constituents and the reinforcement-matrix interface necessitates attention be paid to the micro-mechanics of the situation.
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XI. Structural Composite Systems (cont’d) Even once a basic family of matrix and reinforcement constituents are chosen, the mechanical , physical and structure response of a composite can be highly dependent upon factors such as the following: relative reinforcement size (length, cross-section) mechanical and physical properties of matrix mechanical and physical properties of reinforcement interface and bonding of the reinforcement-matrix shape of reinforcement relative volume content of the reinforcement fabrication procedures environmental conditions such as temperature, humidity, radiation, residual stresses, relative spacing and location array of reinforcement ingredients internal voids, defects, local variations in reinforcement packing, alignment, delaminations, etc.
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XI. Structural Composite Systems ( cont’d) B. Glass-Epoxy : This is a commonly employed structural composite. Popular applications include aerospace hardware, sporting and recreational items, transportation vehicles, pressure vessels and liquid containers, water and sewer pipes, and domestic items. Glass- epoxy composites are available as unidirectionally reinforced plies (bundles or rovings), chopped reinforced epoxy (usually reasonably isotropic in the plane) or twisted yarns may be cross woven to produce a fabric. Glass-epoxy materials are commercially available as unidirectional prepreg tape cross-woven prepreg fabric spools of roving material for winding continuous filament for filament winding cured laminates chopped fibers One can purchase a particular glass filament, roving, yarn or fabric and have it prepregged with a particular resin at a specified fiber content, etc.
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XI. Structural Composite Systems
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This note was uploaded on 08/08/2008 for the course ME 508 taught by Professor Rowlands during the Spring '05 term at Wisconsin.

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me508lecture5 - XI. Structural Composite Systems A. General...

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