isotropy+lecture

Isotropy lecture - Uniaxial testing Outcome Yield stress& Yield strain Results(uniaxial testing XLX 20 10 15 9 15 12 Stress(MPa 10 11 17 13 6 7

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Unformatted text preview: Uniaxial testing Outcome: Yield stress & Yield strain Results (uniaxial testing) XLX 20 10 15 9 15 12 Stress (MPa) 10 11 17 13 6 7 16 14 8 5 0 0 10 20 30 40 Strain (%) biaxial testing Results (biaxial testing) Equibiaxial run 1200 1000 800 600 400 200 0 -200 -0.04 E11 vs S11 E12 vs S12 E22 vs S22 Sij (kPa) -0.02 0.00 0.02 0.04 0.06 0.08 0.10 Eij Results (biaxial testing) XLX control group 1200 Circumferential Radial 1000 Circumferential Radial 1000 TFX control group 1200 Lagrangian stress (kPa) Lagrangian stress (kPa) 800 800 600 600 400 400 200 200 0 1.00 1.02 1.04 1.06 1.08 1.10 0 1.00 1.02 1.04 1.06 1.08 1.10 Average of Lagrangian stress vs stretch for each group Regionally variable mechanical properties 70 60 Tension (N/m) OI (deg) 50 40 30 20 10 0 0 70 60 1 2 3 4 5 N AV leaflet N Tension (N/m) 50 40 30 20 10 0 0 70 60 1 2 3 4 5 M B M Tension (N/m) 50 40 30 20 10 0 0 1 2 3 4 5 XR B XC Green's Strain (a) (b) Complex structure of heart valve leaflets free edge commissure Place Centraloutline here too region belly region radial 1 mm basal attachment circumferential Methods (Flexural testing) specimen Bending bar stationary post M= Flexing moment, EI= Flexural rigidity including E= Effective stiffness, I= Moment of Inertia, k= change of curvature Outcome: moment vs change of curvature using Euler Bernulli equation (M=E.I.K) flexing post Results (flexural testing) XLX6 25 20 Y=110.05 X R2=0.8928 M (mN-mm) 15 10 5 0 0.00 0.05 0.10 -1 0.15 0.20 0.25 (mm ) Moment vs change of curvature relation for a typical sample XLX TFX E (kPa) mean sem 1177 153 1213 93 ...
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This note was uploaded on 04/09/2008 for the course BME 110A taught by Professor Mirnajafizadeh during the Spring '06 term at UC Irvine.

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