Matrix cracking interfacial wear

Fig. 6.18 Schematic representation showing how a reduction in the bridging force by interface wear leads to matrix crack growth. The fibers carry the applied load across the matrix cracks, reduing the crack opening displacement and the net stress intensity (Klip) at the tip of matrix cracks. If the interfacial shear stress t decreases during fatigue, then the bridging stress p(x) decreases, leading to a reduction in Kp. This reduction increases Kfy, which can cause the further extension of a matrix crack.

Glass fibres are beneficial in reducing wear rate provided that the fibre fraction is less than 30 v/o. The interfacial bond between matrix and fibres plays an important role in the wear process. To ensure that cracks do not initiate and propagate in the matrix, leading to failure in these... 

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