Essential work of fracture concept in polymers

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Plane-stress fracture toughness of amorphous copolyester (COP) sheets of different composition and molecular mass characteristics was determined by the essential work of fracture (EWF) concept using tensile-loaded deeply double-edge notched (DDEN-T) specimens. It was determined that these COPs meet the basic requirement of the EWF concept since their yielding along the full ligament preceded crack growth. A drop in load in the corresponding load-displacement (F - x) curves indicated yielding and allowed us to split both the specific essential and non-essential work of fracture (we and wp, respectively) into their contributing terms based on yielding (wy) and necking including fracture (wn). Development and size of the plastic zone were studied by light microscopy (LM) and infrared thermography (IT).

Original languageEnglish
Pages (from-to)91-102
Number of pages12
JournalPeriodica Polytechnica Mechanical Engineering
Issue number2
Publication statusPublished - Jan 1 2003



  • Essential work
  • Fracture mechanics
  • Infrared thermography
  • Non-essential work
  • Plastic work
  • Polyethylene terephthalate

ASJC Scopus subject areas

  • Mechanical Engineering

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