Journal
MATERIALS & DESIGN
Volume 31, Issue 2, Pages 802-807Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2009.07.054
Keywords
Polymer matrix composite; Nano materials; Deformation and fracture
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The fracture toughness and deformation mechanism of PP/CaCO3 (15 wt.%) composites were studied and related to load-bearing capacity of the particles. To alter the load-bearing capacity of the particles, different particle sizes (0.07-7 mu m) with or without stearic acid coating were incorporated. The fracture toughness of the composites was determined using J-Integral method and the deformation mechanism was studied by transmission optical microscopy of the crack tip damage zone. It was observed that the load-bearing capacity of the particles decreased by reduction of particle size and application of coating. A linear relationship between normalized fracture toughness and inverse of load-bearing capacity of particles was found. The crack tip damage zone in composites, which consists in massive crazing, further grows by reduction in load-bearing capacity. (C) 2009 Elsevier Ltd. All rights reserved.
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