Combined Effects of Sustained Loads and Wet-Dry Cycles on Durability of Glass Fiber Reinforced Polymer Composites

Figure 4

Micrographs of the surfaces (×50) of the unstressed specimens: (a) unconditioned specimen; (b) SWD0 after 60 WD cycles; and (c) WWD0 after 180 WD cycles.

(a)

(b)

(c)