Abstract
The Finite Element Method is applied to an analysis of the stress distribution in the spherulite under uniaxial tension. The spherulite model of our calculation consists of three parts: the nucleus in the center, the crystalline macrofibrills and the amorphous region. The crystalline region, which has a higher Young's Modulus than the amorphous region, grows in the radial direction, dividing into branches. Our result predicts that in the sector near the tensile axis, the crystalline deformation is dominant; and in the sector perpendicular to the tensile axis, the amorphous deformation is dominant; and that the stress concentration which occurs in the junctions of crystalline macrofibrils and the center region, in which the distribution density of the junctions is fairly high, would be the nucleus of interspherulite fracture. Since a rupture was observed in our experiment of tensile loaded POM spherulites.
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