Model-Based Experimental Development of Passive Compliant Robot Legs from Fiberglass Composites

Table 2

Forces versus displacements of the fiberglass composite strips made by the E-glass (0°) and E-glass (−45°, 0°, 45°) with three different cutting directions (0°, 45°, 90°).

	Disp. (mm)	Test #1 (N)	Test #2 (N)	Test #3 (N)	Test #4 (N)	Test #5 (N)	Test #6 (N)	Test #7 (N)	Average (N)	Std (N)
E-glass (−45°, 0°, 45°)-0°	5	6.39	6.47	5.67	6.42	6.37	6.43	6.20	6.28	0.28
	7	9.04	8.92	7.90	8.86	8.80	9.10	8.65	8.75	0.41
	10	12.82	12.88	11.32	12.78	12.68	12.91	12.39	12.54	0.56
E-glass (−45°, 0°, 45°)-45°	5	4.23	4.61	3.67	3.84	3.92	4.10	4.07	4.06	0.30
	7	6.01	6.39	5.19	5.42	5.63	5.73	5.78	5.74	0.39
	10	8.51	9.20	7.37	7.70	7.89	8.20	8.18	8.15	0.59
E-glass (−45°, 0°, 45°)-90°	5	3.07	3.20	2.38	2.69	2.57	2.71	2.74	2.76	0.28
	7	4.40	4.38	3.59	3.78	3.65	3.75	3.91	3.92	0.34
	10	6.18	6.36	4.88	5.38	5.16	5.40	5.51	5.55	0.54
E-glass (0°)-0°	5	4.43	4.64	3.51	4.09	5.44	5.76	5.05	4.70	0.78
	7	6.25	6.47	4.89	5.78	7.80	8.12	7.13	6.64	1.14
	10	8.88	9.27	7.02	8.21	10.96	11.55	10.13	9.43	1.58
E-glass (0°)-45°	5	1.56	1.59	1.12	4.09	1.37	1.37	1.32	1.77	1.03
	7	2.23	2.26	1.60	5.78	1.95	1.99	1.91	2.53	1.45
	10	3.14	3.19	2.26	8.21	2.75	2.78	2.66	3.57	2.07
E-glass (0°)-90°	5	1.25	1.21	1.02	1.29	1.08	1.08	1.21	1.16	0.10
	7	1.74	1.72	1.47	1.85	1.67	1.50	1.67	1.66	0.13
	10	2.50	2.44	2.07	2.60	2.23	2.15	2.41	2.34	0.20