A Pressure-Volume System for Measuring Mechanical Properties of Small Diameter Vessels
No. 37 (2012-07-01)Author(s)
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Javier Navarro Rueda(1) MSc en Ingeniería Mecánica. j.navarro25@uniandes.edu.co
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Diana M. Sánchez Palencia(2) MSc en Ciencias Biomédicas. Estudiante Doctoral. dm.sanchez310@uniandes.edu.co
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Lina M. Quijano Luque(3) MSc en Ciencias Biomédicas. l-quijan@uniandes.edu.co
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Juan C. Briceño Triana(4) Doctor en Ingeniería Biomédica de la Universidad de Texas. Profesor Titular. jbriceno@uniandes.edu.co
Abstract
Mechanical properties of Small-Diameter Vessels (SDV) are scarcely studied. The proposed Pressure-Volume (PV) system, developed to evaluate stress-strain (σ-ε) behavior of SDV, allows the controlled variation of internal pressure and simulation of pressure-induced diameter changes of tubes. Measurements were taken from contrast-improved images captured for each internal pressure value. A circular cross-section tube in equilibrium, with elastic wall and known pressures was assumed to determine circumferential stress and strain. σ-ε curves were obtained and validated against tensile uniaxial (TU) testing. Although different behaviors were expected, experimental data is consistent when compared to TU results, differentiating by 5.68 to 12.60 %.