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Solidification, under nonisothermal conditions and pressure gradients present during processing, is shown to be a major contributor to the generation of internal stresses in advanced composite materials. These stresses may be amplified in composite materials with significant anisotropic...
An experimental investigation was performed to quantify the relationship between fiber-matrix adhesion as determined by single fiber interfacial shear strength tests with the compressive properties and failure modes of unidirectional graphite/epoxy com posites. The compression tests were...
In this study, a multi-purpose sensor for composite laminates is devel oped. The sensor is based on a piezo-electric film. A specialty charge amplifier was devel oped for signal conditioning for long time duration measurements. Experiments were con ducted to show the utility of the sensor for...
A method of predicting the crash-related energy-absorption capability of composite tubes is presented. The method is based upon a phenomenological model of the crushing process exhibited by continuous-fiber-reinforced tubes. A finite element method is used to model the crushing process. The...
Mode I interlaminar fracture of interleaved graphite/epoxy has been stud ied experimentally using double cantilever beam (DCB) specimens and optical micros copy. The interleaves were either thermoset or thermoplastic films placed at the midplane along the anticipated fracture plane. To examine...
An analytical and experimental investigation was performed to study the compression response of laminated composites containing multiple delaminations. It was of particular interest to determine the effects of delaminations on the residual stiffness and strength of delaminated composite...
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