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Acoustic emission (AE) and scanning electron microscope (SEM) techniques have been coupled with mechanical deformation to study the damage and fracture mechanisms in a short fiber BMC composite. During tensile deformation the initial damage process observed in the SEM was the formation of small...
This paper treats the optimum design of graphite/epoxy laminated composite cylindrical pressure vessels under stiffness and strength constraints based upon the membrane theory. Stiffness constraints are specified as strain conditions both in the axial and circumferential directions. Tsai-Wu...
The initiation ofdelamination in graphite/epoxy specimens was investigated both analyt ically and experimentally. Three specific laminate families were investigated: (±15 n ) s , (± 15 n /0 n ) s , and (0 n / ± 15 n ) s with the normalized effective ply thickness, n, varying from one to five....
The transverse shear effect should be included in calculating the natural frequencies of advanced composite material because of its high ratio of elastic modulus to shear modulus. The method which can include the transverse shear effect in calculating the natural fre quencies of thin orthotropic...
This paper presents studies of the axisymmetric free vibration of moderately thick orthotropic complete spherical shells. The mathematical model is formulated in terms of the mid-surface meridian and radial displacements, and cross-section rotation of the meridians by the improved linear elastic...
A different approach to the problem of estimating the strength distribution of brittle fibers is proposed. The procedure assumes a Poisson flaw model, but rather than presum ing a particular functional form, it is assumed that the probability distribution of strength has an increasing failure...
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