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The effects of net-shape machining on the mechanical properties of a graphite/bismaleimide (Gr/Bmi) laminate were investigated under pure bending. An experimental evaluation of the acoustic emission during loading, bend load and energy to failure, and optical documentation of first ply failure was conducted. Experimental results were also compared with predictions for failure from a finite element model using conventional failure criteria. It was found that surface texture has a significant influence on the mechanical properties of fiber-reinforced plastics (FRPs) and that the static bend strength decreased with increasing surface roughness. Acoustic emission prior to the onset of failure indicated that damage accumulation was clearly dependent on the method of machining. It was also found that the location of first ply failure was influenced by the process-dependent surface structure, but not by the magnitude of surface roughness.
University of Maryland, Baltimore County, Baltimore, MD
University of Washington, Seattle, WA
Stock #: CTR10240J