Browsing by Author "Tanner, KE"

Now showing 1 - 2 of 2
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    Effect of morphological features and surface area of hydroxyapatite on the fatigue behavior of hydroxyapatite-polyethylene composites
    (BIOMACROMOLECULES, 2005) Joseph, R; Tanner, KE
    The effect of surface area and morphological features of filler particles on the fatigue behavior of hydroxyapatite-filled high-density polyethylene composites was studied. Composites containing 40 vol % filler were injection-molded into tensile bars, gamma-irradiated, and subjected to sinusoidal tensile fatigue at a frequency of 2 Hz. To simulate the physiological environment, the tests were conducted at 37 degrees C in saline. Results showed that properties such as secant modulus, cyclic energy dissipation, dynamic creep strain, hysteresis loops, and even fracture surfaces differ depending on the morphology and surface area of the fillers used.
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    Interfacial stick-slip transition in hydroxyapatite filled high density polyethylene composite
    (BULLETIN OF MATERIALS SCIENCE, 2006) Joseph, R; Martyn, MT; Tanner, KE; Coates, PD
    Effect of filler addition and temperature on the stick-slip transition in high density polyethylene melt was studied. Results showed that shear stresses corresponding to stick-slip transition increases with the addition of filler. Increase in temperature also increases the shear stresses for stick-slip transition. The features of the flow curves of composites and that of unfilled system remain identical. Filler addition lowers the shear rate at which the transition occurs. The composite extrudate did not show characteristic extrudate distortions associated with the unfilled polymer.