%0 Journal Article %T Mechanical behavior measurement of the sheep small intestine using experimental tests %J Iranian Journal of Veterinary Medicine %I University of Tehran %Z 2251-8894 %A Rassoli, Aisa %A Fatouraee, Nasser %D 2016 %\ 09/01/2016 %V 10 %N 3 %P 201-207 %! Mechanical behavior measurement of the sheep small intestine using experimental tests %K anisotropic constitutive model %K fung-type model %K nonlinear tissue %K modify Mooney-Rivlin model %K strain-energy function %R 10.22059/ijvm.2016.58682 %X Background: There is no consistent data on the mechanical properties of sheep intestine. OBJECTIVES: We performed a series of biaxial strain measurement experiments and extracted the constitutive model to describe the mechanical characteristics of the sheep intestinal tissue. METHODS: Eleven specimens were obtained freshly from sacrificed  sheep and the planar biaxial tests were performed on the tissue specimens by applying simultaneous loads along the circumfer-ential and longitudinal directions. Then the measured data were fitted into the anisotropic four-parameter Fung-type model and also to the modified Mooney-Rivlin model. RESULTS: The specimens showed some degree of anisotropy; the stiffer direction is not gener-ally predictable. Some of the specimens were stiffer in the circumferential direction, and the others in the longitudinal direction. However, the average results state the circumferential di-rection as the stiffer orientation. CONCLUSIONS: It can be concluded that sheep intestine be-haves normally as a nonlinear anisotropic tissue which is well-characterized by the modified Mooney-Rivlin model. %U https://ijvm.ut.ac.ir/article_58682_81ca2a37b9faaf17f6a41385c7458828.pdf