Journal
COMPOSITES PART B-ENGINEERING
Volume 43, Issue 8, Pages 3467-3481Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2012.01.042
Keywords
Polymer-matrix composites (PMCs); Particle-reinforcement; Fracture; Impact behaviour; Micro- vs. nano-composites
Funding
- National Science Foundation [NSF-CMMI-0653816]
- US Army Research Office [DAAD19-02-10126]
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The role of nano- vs. micro-filler particle size-scale on static and dynamic fracture behaviors of silicafilled epoxy is examined. Particulate composites of epoxy matrix are studied under quasi-static and stress-wave loading conditions. Mode-I crack initiation and crack growth behaviors are examined using 2D digital image correlation method and high-speed photography in symmetrically impacted specimens. The measured displacement fields are analyzed using 20 crack-tip fields for dynamically propagating cracks in brittle solids to extract stress intensity factor (K-1(d)) histories, and crack velocity histories (V). K-1(d)-V plots for each type of composite are also presented. The quasi-static fracture tests show fracture toughness enhancement in case of nanocomposites relative to micro-particle filled ones. On the other hand, the dynamic crack-initiation toughness is consistently higher for micro-particle filled composites relative to the nano-filler counterparts. These counterintuitive results are supported by crack velocity histories in nanocomposites being significantly higher than that observed in micro-filler cases. The characteristic K-1(d)-V profiles suggest higher terminal velocities and lower dynamic fracture toughness for nanocomposites. Also, the post-mortem analyses of fracture surfaces reveal greater surface ruggedness for nanocomposites under quasi-static conditions. However, the opposite is evident under dynamic loading conditions. The qualitative and quantitative fractographic measurements correlate well with the measured fracture parameters for both quasi-static and dynamic fracture tests. (C) 2012 Elsevier Ltd. All rights reserved.
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