Damped Free Vibration Analysis of Woven Glass Fiber-Reinforced Epoxy Composite Laminates

Table 4

Values of frequency for mode 1, logarithmic decrement, and damping coefficient.

Composition glass/epoxy	Frequency for mode 1, fn (Hz)		Logarithmic decrement δ		Damping coefficient ξ
	Experimental	Analytical	Experimental	Analytical	Experimental	Analytical
50/50%	31.02	32.13	0.28	0.26	0.044	0.042
60/40%	37	46.06	0.19	0.23	0.030	0.036
70/30%	47.18	55.89	0.12	0.18	0.019	0.029