Table 1.

Mechanical properties of the collagen fibrils tested in this study.

fibril no.	wet diameter (nm)	initial σ/ɛ ratio (MPa)	maximum strain (%)	fracture stress (MPa)	toughness (×106 J m−3)
1	134.68	391	51.84	58.66	23.33
2	207.29	185	66.71	58.65	25.57
3	161.94	160	106.55	54.37	44.88
4	173.93	459	57.07	85.23	37.14
5	188.00	520	51.20	83.19	31.66
6	159.51	266	35.77	66.19	13.20
7	119.26	287	61.33	93.59	39.93
8	250.26	329	81.44	50.60	33.44
9	184.22	467	36.03	65.54	19.24
10	190.55	315	85.74	74.97	56.67
11	216.03	190	42.39	39.26	11.97
12	159.64	341	82.83	130.29	71.32
mean	178.78	325.83	63.24	71.71	34.03
s.d.	34.27	112.12	21.13	23.17	16.82