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

Table 3

Predictive equations for tensile strength.

Exposure environment	Load level	Equation	-square
Wet-dry cycles in distilled water	0%		0.97
			0.99
	20%		0.92
			0.51
	40%		0.91
			0.42
Wet-dry cycles in saltwater	0%		0.83
			0.94
	20%		0.96
			0.63
	40%		0.95
			0.62

Note.  -square is the coefficient of determination. It denotes the proportion of the variance in the dependent variable which is predictable from the independent variables.