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The fundamental internal friction behavior of carbon-carbon composites is studied. Two internal friction mechanisms are proposed according to the special internal friction characteristics in carbon-carbon composites. A thermoelastic mechanism, which is independent of amplitude, mainly leads to the internal friction increase with increasing frequency. The other is a static hysteresis mechanism that...
The damping behavior of various carbon-carbon (C/C) composites fabricated by chemical vapor infiltration (CVI) techniques has been investigated in the low-frequency range by means of a pendulum method. Two groups of samples of C/C composites were employed in this study, one with constant fiber volume fractions but with various densities from 1.02 to 1.69 gcm -3 , and the other with the...
A finite difference (FD)-based method is proposed to describe the chemical vapor infiltration (CVI) processes for fabrication of carbon–carbon composites. The continuous, unsteady-state CVI processing can be divided into many discrete steady-state depositions by this model. Long cylindroid unidirectional carbon–carbon composites are prepared using the isothermal CVI technique to verify the accuracy...
A detailed study of the interfacial microstructures of the intrabundles in as-receivedcarbon/carbon composites prepared by CVI was performed by high-resolution electron microscopy. Two kinds of carbon fibers, high strength carbon fiber T300 and high modulus carbon fiber T-50, were chosen for comparison. It was found that the interface between the carbon fiber and carbon matrix is not simply a mechanical...
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