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Interfacial bonding

Most recent studies (69) on elevated temperature performance of carbon fiber-based composites show that the oxidation resistance and elevated temperature mechanical properties of carbon fiber reinforced composites are complex and not always direcdy related to the oxidation resistance of the fiber. To some extent, the matrix acts as a protective barrier limiting the diffusion of oxygen to the encased fibers. It is therefore critical to maintain interfacial bonding between the fiber and the matrix, and limit any microcracking that may serve as a diffusion path for oxygen intmsion. Since interfacial performance typically deteriorates with higher modulus carbon fibers it is important to balance fiber oxidative stabiHty with interfacial performance. [Pg.7]

The JKR theory is essentially an equilibrium balance of energy released due to interfacial bond formation and the stored elastic energy. For simple elastic solids the deformation as a function of load, according to the JKR theory is given by... [Pg.89]

B. Degradation of the fiber-matrix interface resulting in loss of adhesion and interfacial bond strength. [Pg.360]

Figure 13 Interfacial bonding mechanism of the ferocene and aziridine based compounds. Figure 13 Interfacial bonding mechanism of the ferocene and aziridine based compounds.
A unique but not yet widespread technique that may influence the interfacial bond quality relies on the localized variation in the polymer modulus normal to the polymer-substrate junction in the composite assembly, as illustrated schematically in Fig. 15 [41,52]. The transversal modulus variation may be accomplished by interposing a tertiary interphase between the substrate and... [Pg.716]

Materials used in body implants must meet several essential requirements such as tissue compatibility, enzymatic and hydrolytic stability. They must also be chemically resistant and have good mechanical properties. They must not be toxic, or the surrounding tissue will die. They must be resistant to the body fluids which usually have a high percentage of chloride ions. They must be biologically active if an interfacial bond is to be achieved. In some cases, they must be able to withstand continued high mechanical stresses for many years. [Pg.447]

T. Sugama, L. E. Kukacka, N. Carciello, and B. Galen. Oxidation of carbon fiber surfaces for improvement in fiber-cement interfacial bond at a hydrothermal temperature of 300° C. Cement Concrete Res, 18(2) 290-300, March 1988. [Pg.465]

In summary, the alumina nanolayers formed by the high-temperature oxidation on NiAl alloy surfaces are structurally and chemically very different from the bulk-terminated surfaces of the various A1203 phases, and they thus provide very prototypical examples of oxide phases with novel emergent properties because of interfacial bonding and thickness confinement effects. [Pg.155]

The bonding mechanism between glass and bone has been described in detail [ 36]. The basis for bone bonding is the reaction of the glass with the surrounding solution. A sequence of interfacial reactions, which begin immediately after the bioactive material is implanted, leads to the formation of a CHA layer and the establishment of an interfacial bonding. The sequence of interfacial reactions can be summarized as follows ... [Pg.372]

To improve the interfacial bonding between the PP fiber and a cementitious matrix, commercially available PP fibers with different geometries were fluori-nated and the effect evaluated with regard to crack control, impact resistance (AC1 Committee 544 Report), and water absorption (ASTM C-948).M,34a In all cases, as seen in Table 16.13, fluorination improved the induced properties. [Pg.255]


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Interfacial bond

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