In this paper, a pig's rectum was studied as a model biomaterial and its mechanical behaviors under tensile, compressive, and shear stresses were measured accurately using a multipurpose microtesting system. Based on the stress-strain relations of samples of different orientations, the tangential moduli were calculated through a reverse method combined with self-correlation analysis. The experimental data exhibited pronounced nonlinear and anisotropic characteristics. It was found that the effective compliance in tension along the longitudinal direction was larger than that along the circumferential direction, but smaller than that along the out-of-plane direction.

ABSTRACT:In a fracture experiment of polymers, the total fracture work usually consists of an essential part associated with the plastic deformation at the crack tip and a nonessential part related to the viscous relaxation in the background. In this article, the essential fracture work in nylon 6-silicate nanocomposites is measured through a series of double-notched-sample (DNS) tests. The samples are of different silicate contents and crystallization conditions.As the cooling rate rises, the essential work is nearly constant while the total fracture work increases considerably, which should be attributed to the change in effective viscosity. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 815-819, 2005

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