Nano-scale fracture study of nanoparticulate composites

R. L. Karkkainen, A. A. Bujanda, T. R. Walter

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The objective of the current study is to combine modeling and experimental efforts in fracture mechanics analysis to investigate causal phenomenon behind well-documented toughening effects in nanoparticulate reinforced polymers. Both modeling and experimental techniques are designed to operate on the micro and nano scales of active mechanisms which contribute to fracture property differences. The Extended Finite Element Method (XFEM) advanced fracture analysis technique has been employed. This node enrichment scheme for investigation of arbitrary-path crack propagation enables modeling of tortuous crack propagation with no required pre-knowledge of crack paths or locations. To overcome limitations of this method in investigation of inhomogeneous materials, cohesive interfacial elements have further been introduced, independent of the XFEM enriched domain. This overcomes arbitrary crack arrest issues at material interfaces and improves the critical consideration of the interface between reinforcing particles and the bonding polymer matrix phase with dedicated material properties and interphase treatment. A third method involving element deletion with a refined mesh has also been employed. Polycarbonate with silica inclusions has been computationally investigated. Fracture property assessment using the computational results has been performed. A parallel effort involving nano-scale experimentation under SEM observation has been designed to employ Mode I and Mode II fracture specimens prepared for direct observation of crack growth in a nanoparticulate-reinforced epoxy system.

Original languageEnglish (US)
Title of host publication27th Annual Technical Conference of the American Society for Composites 2012, Held Jointly with 15th Joint US-Japan Conference on Composite Materials and ASTM-D30 Meeting
Pages559-573
Number of pages15
StatePublished - Dec 1 2012
Event27th Annual Technical Conference of the American Society for Composites 2012, Held Jointly with 15th Joint US-Japan Conference on Composite Materials and ASTM-D30 Meeting - Arlington, TX, United States
Duration: Oct 1 2012Oct 3 2012

Publication series

Name27th Annual Technical Conference of the American Society for Composites 2012, Held Jointly with 15th Joint US-Japan Conference on Composite Materials and ASTM-D30 Meeting

Other

Other27th Annual Technical Conference of the American Society for Composites 2012, Held Jointly with 15th Joint US-Japan Conference on Composite Materials and ASTM-D30 Meeting
CountryUnited States
CityArlington, TX
Period10/1/1210/3/12

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Karkkainen, R. L., Bujanda, A. A., & Walter, T. R. (2012). Nano-scale fracture study of nanoparticulate composites. In 27th Annual Technical Conference of the American Society for Composites 2012, Held Jointly with 15th Joint US-Japan Conference on Composite Materials and ASTM-D30 Meeting (pp. 559-573). (27th Annual Technical Conference of the American Society for Composites 2012, Held Jointly with 15th Joint US-Japan Conference on Composite Materials and ASTM-D30 Meeting).