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Compared to static culture, pulsatile stimulation of cellular constructs resulted in 70% higher circumferential strength.
It is demonstrated that recently developed hoop-wound composite material disks having elastomeric resin and carbon fibers can enter a critical state before reaching the circumferential strength limit of the material if certain material and geometric relationships are met.
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While the bilayer structure had excellent circumferential tensile strength, bursting strength and suture retention resistance, the radial compliance did not show any observable improvement.
Compared with the strengths in the circumferential and the longitudinal directions, the strength of the radial direction for the pipe is weaker.
Results show that with large longitudinal strength the circumferential crack is the main failure form because of the shear effect.
Thus, it is shown that the circumferential compliance and burst strength of vascular grafts can be analytically predicted by knowing the elastic and yield material properties accurately, without needing to actually test the graft under radial pressure.
The circumferential compliance and burst strength of vascular grafts are predicted through the conically modified von Mises and elasticity theories, providing an analytical closed form solution for both parameters.
Three different wrap thicknesses, wrap ply angle configurations of 0°, ±15°, and 0°/±15°/0° with respect to the circumferential direction, and concrete strength values ranging from 3 ksi to 6 ksi were considered.
The average measured circumferential compliance and burst strength of an 8 mm graft made of a commonly used biomaterial, Tecoflex® SG-80A, are 1.05%/100 mmHg-1 and 34.1 psi (1763 mmHg) and the proposed analytical predictions fall within the experimental scattering.
This model is based on the existence and strength of the circumferential flow, most often generated by the shaft rotation.
The anterior leaflet displayed the largest directional anisotropy with significantly higher strength in the circumferential direction compared to the posterior leaflet.
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