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Acta Mechanica Solida Sinica

, Volume 26, Issue 5, pp 448–457 | Cite as

Dynamic Fracture Analysis of Aged Glassy Polycarbonate by the Method of Caustics

  • Guiyun Gao
  • Zheng Li
  • Mehrdad Negahban
Article

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.

Keywords

polycarbonate physical aging dynamic fracture stress intensity factor 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics and Technology 2013

Authors and Affiliations

  1. 1.State Key Lab for Turbulence and Complex Systems and College of EngineeringPeking UniversityBeijingChina
  2. 2.Department of Engineering MechanicsUniversity of Nebraska-LincolnLincolnUSA

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