Dynamic fracture analysis of aged glassy polycarbonate by the method of caustics

Guiyun Gao, Zheng Li, Mehrdad Negahban

Research output: Contribution to journalArticle

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Abstract

The purpose of this work is to investigate the dynamic fracture properties of glassy polycarbonate (PC) with different aging times. The optical method of caustics is adopted in which the shadow spot patterns are recorded by a high speed camera during the dynamic fracture process. Then, the dynamic crack propagation, the stress intensity factor (SIF) and the dynamic fracture toughness of aged PC are obtained through an analysis of the characteristic size of caustic pattern. Moreover, by combining with the investigation of the fracture surface and the energy release rate analysis, the influence of aging time on the dynamic fracture behavior is discussed. Results show that the dynamic fracture toughness and critical energy release rate of PC decreases with aging time for short aging times, whereas they have little change or even increase for longer aging times. Therefore, aging modifies the mechanical properties especially the dynamic fracture properties of PC nonlinearly, not linearly as generally thought of.

Original languageEnglish (US)
Pages (from-to)448-457
Number of pages10
JournalActa Mechanica Solida Sinica
Volume26
Issue number5
DOIs
Publication statusPublished - Oct 1 2013

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Keywords

  • dynamic fracture
  • physical aging
  • polycarbonate
  • stress intensity factor

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Mechanical Engineering

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