Acta Mechanica Sinica

, 18:480 | Cite as

Effect of triaxial stress constraint on the deformation and fracture of polymers

  • Wang Tiejun
  • Kikno Kishimoto
  • Mitsuo Notomi
Article

Abstract

One purpose of this paper is to give a brief overview on the research status of deformation, fracture and toughening mechanisms of polymers, including experimental, theoretical and numerical studies. Emphasis is on the more recent progresses of micromechanics of rubber particle cavitation and crazing, and the development of fracture criteria for ductile polymers.

The other purpose is to study the effect of triaxial stress constraint on the deformation and fracture behavior of polymers. Polycarbonate (PC), acrylonitrile-butadienestyrene (ABS) and PC/ABS alloy are considered in this investigation. A series of circumferentially blunt-notched bars are used to experimentally generate different triaxial stress fields. The fracture surfaces of specimens with different notch radius are examined by scanning electron microscope (SEM) to study the fracture and toughening mechanisms of polymer alloy. It is shown that the triaxial stress constraint has a significant effect on the deformation, fracture and toughening of PC, ABS and PC/ABS alloy. We will also discuss the extent to which a micromechanics criterion proposed by the first author can serve as a fracture criterion for ductile polymers. A new ductile fracture parameter is emphasized, which can be employed to evaluate the fracture ductility of polymers. Stress state independence of the parameter for the PC, ABS and PC/ABS alloy has been experimentally verified.

Key Words

deformation fracture toughening cavitation craze micromechanics PC ABS polymer alloy 

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Copyright information

© Chinese Journal of Mechanics Press 2002

Authors and Affiliations

  • Wang Tiejun
    • 1
  • Kikno Kishimoto
    • 2
  • Mitsuo Notomi
    • 3
  1. 1.Department of Engineering MechanicsXi'an Jiaotong UniversityXi'anChina
  2. 2.Department of Mechanical and Control EngineeringTokyo Institute of TechnologyTokyoJapan
  3. 3.Department of Mechanical EngineeringMeiji UniversityKawasaki-shi, KanagawaJapan

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