CUED Publications database

Time-dependent fracture toughness of cornea.

Tonsomboon, K and Koh, CT and Oyen, ML (2014) Time-dependent fracture toughness of cornea. J Mech Behav Biomed Mater, 34. pp. 116-123.

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The fracture and time-dependent properties of cornea are very important for the development of corneal scaffolds and prostheses. However, there has been no systematic study of cornea fracture; time-dependent behavior of cornea has never been investigated in a fracture context. In this work, fracture toughness of cornea was characterized by trouser tear tests, and time-dependent properties of cornea were examined by stress-relaxation and uniaxial tensile tests. Control experiments were performed on a photoelastic rubber sheet. Corneal fracture resistance was found to be strain-rate dependent, with values ranging from 3.39±0.57 to 5.40±0.48kJm(-2) over strain rates from 3 to 300mmmin(-1). Results from stress-relaxation tests confirmed that cornea is a nonlinear viscoelastic material. The cornea behaved closer to a viscous fluid at small strain but became relatively more elastic at larger strain. Although cornea properties are greatly dependent on time, the stress-strain responses of cornea were found to be insensitive to the strain rate when subjected to tensile loading.

Item Type: Article
Uncontrolled Keywords: Cornea Fracture toughness Mechanical behavior Rubber Tissue mechanics Trouser tear Viscoelasticity Animals Biomechanical Phenomena Cornea Corneal Injuries Materials Testing Mechanical Phenomena Polymers Stress, Mechanical Swine Time Factors
Divisions: Div C > Biomechanics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:06
Last Modified: 19 Jul 2018 06:43