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Fig. 7 | BioMedical Engineering OnLine

Fig. 7

From: Processing of collagen based biomaterials and the resulting materials properties

Fig. 7

Stress-strain curve of the middle layer of wet porcine hide as an example for typical stress–strain behaviour of collagen tissues (own measured values). Toe region: Fibre and fibril crimps are straightened (tendon) and fibres are aligned (skin); the gap overlap ratio increase; resetting is caused by elastin fibres; Elastic region: Elastic fibres are deformed and fibres, fibrils and microfibrils begin to slide against each other; microfibrillar super twist causes torque transfer at crosslinks; molecules begin to stretch and to shear; Plastic region: Tissue begins to yield; interfacial delamination; plastic fibres deform and slide against each other; partial disruption of entanglements; exudation of bound water; helices uncoil and slide against each other. Rupture: Tissue delaminates (skin) and disrupts in layer; fibres, fibrils and microfibrils defibrillate, disrupt and pull out; crosslinks between the molecules disrupt. YS, yield strain; UTS, ultimate tensile strength; [116, 509]

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