Strain-rate sensitivity of porcine and ovine corneas

• Autorzy: Elsheikh A. , Kassem W. , Jones S.W.
• Języki publikacji: EN

Abstrakty

EN

Knowledge of strain-rate sensitivity of corneal tissue is important for improving the understanding of the tissue's response to mechanical actions and the accurate numerical simulation of corneal biomechanical behaviour under the effects of disease and surgery. In the study, fresh and well-preserved porcine and ovine corneal buttons were subjected to uniaxial tension loads with seven different strain rates ranging between 0.8 and 420% per minute. All specimens exhibited increased stiffness (as measured by the tangent modulus) with higher strain rates. However, clear differences in their behaviour were observed. While ovine corneas showed gradual, consistent and mostly statistically significant increases in stiffness with all elevations in strain rate, porcine corneas' response was significant over only a limited range of low strain rates. The effect of strain rate on the material's stress-strain behaviour was considered in the formation of three sets of constitutive models including: (i) a model based on a simple exponential stress-strain relationship, (ii) the Ogden model that considers the tissue's hyperelasticity but not anisotropy, and (iii) a third model by Holzapfel, Gasser and Ogden that considers both hyperelasticity and anisotropy. The three models are introduced to enable consideration of the strain rate effects in simulations employing finite element programs with varying capabilities or in modelling applications in corneal biomechanics which may or may not require consideration of mechanical anisotropy.

Słowa kluczowe

EN

cornea; mechanical behaviour; strain-rate effects; experimental testing

PL

rogówka; zachowanie mechaniczne; szybkość odkształcenia; badania doświadczalne

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Acta of Bioengineering and Biomechanics
• Rocznik: 2011
• Tom: Vol. 13, no. 2
• Strony: 25--36
• Opis fizyczny: Bibliogr. 40 poz., rys., tab.

Twórcy

autor

Elsheikh A.

autor

Kassem W.

autor

Jones S.W.

• School of Engineering, University of Liverpool, UK,

Bibliografia

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