FIGURE 8 Hysteresis loops measured on the tensile testing of CMCs: (a) 0/90, (b) ±45. SOURCE: Reprinted from Evans (1997) [26], copyright 1997, with permission from Elsevier Science.

Friction at the interfaces dictates the dimension over which stress concentrations around failed fibers are eliminated. This dimension becomes an internal scale parameter, which allows fiber failures to occur in a spatially uncorrelated manner. When this happens, global load sharing (GLS) ensues with an associated UTS given by

where

and



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