The Comparative Analysis of Stress Relaxation Characteristics of Normal and Pothologycal Cornea
LI Shuang
LI peng
YUAN Yi
Abstract：To compare the stress relaxation mechanics of normal and morbid state corneas by establishing normal and the morbid state cornea stress relaxation functional equation and the stress relaxation curve,and to provide the biological mechanical parameters for clinical.10 corneas of the normal persons′corpse cornea and the morbid state (the corneas of patients with transplanted corneas) corneas were taken respectively,and then the stress relaxation experiment was conducted with electronic universal testing machine.We simulated human body temperature at a temperature of 36.5 ±0.5 ℃,and then applied a tensile strain in the sample 0.1%/state of increase of the strain,and collected 100 data,then the stress relaxation data were dealed with normalized analysis method,and finally the stress relaxation curve was fitted.The stress relaxation quantity of the coreas of the normal control group at 7 200 s was 0.61 MPa, the stress relaxation quantity of the corneas of the morbid state group at 7 200 s was 0.46 MPa,the stress relaxation quantity of normal control group at 7 200 s was more than that of the morbid state group,and the differences were obviously (P<0.05 ).The stress relaxation curve changes with logarithm relations.The stress relatation characteristic of pothlogy has changed.
Keywords：CorneaNormalPothologicalViscoelasticStress relaxationContrast analysis
Publication Date：2013-01-01
Online Publishing Date：2026-09-11(First online date of this platform, not the publication date of the document)
Pages：4( 174-176,179 )