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

Figure 9

Micrographs of the surfaces (×50) of stressed specimens: (a) SWD2 after 60 WD cycles; (b) SWD2 after 180 WD cycles; (c) WWD2 after 180 WD cycles; and (d) SWD4 after 180 WD cycles.

(a)

(b)

(c)

(d)