Fabrication and Experimental Estimation of Mechanical Properties of Kevlar-Glass/Epoxy Interwoven Composite Laminate

Table 8

Mode-1 fracture test results.

Orientation	Load P (N)	Length W (mm)	Thickness B (mm)	Crack length A (mm)	Fracture toughness K (MPa)	Average fracture toughness (MPa)
1 × 1	1,410	31.6	3.2	14	373.27	552.43
	1,455	32.5	2.8	13.2	668.17
	1,470	31.3	3	11	555.04
	1,355	32.9	3.1	14.7	613.24
3 × 3	1,365	32.5	3.1	11	464.61	513.13
	1750	31.6	2.8	10	635.09
	1,035	32.2	3	14.5	504.28
	1,055	32.6	2.9	13	448.54
5 × 5	1520	32.5	2.9	14	720.11	589.94
	1,180	31.2	2.8	11	478.04
	1905	31.8	3	12	769.23
	1,190	32.5	3.2	10.9	392.39