Session H32: Focus Session: Tribophysics -- Fracture and Plasticity
8:00 AM–11:00 AM, Tuesday, March 16, 2010
Room: E142
Sponsoring Units:
GSNP DMP
Chair: Bernd Gotsmann, IBM Zurich
Abstract ID: BAPS.2010.MAR.H32.12
Abstract: H32.00012 : Effects of Molecular Architecture on Shear Band Formation and Mode II Fracture of Polymeric Glasses
10:36 AM–10:48 AM
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Abstract 
Authors:
Jared Archer
(University of Massachusetts - Amherst)
Alan Lesser
(University of Massachusetts - Amherst)
Mode II fracture studies were performed at various rates on a series of acrylic polymers and on polycarbonate (PC). The shear banding response of polymethyl methacrylate (PMMA) is shown to be highly sensitive to rate. As the rate increases, shear deformation becomes more localized to the point where Mode II fracture occurs. PC is much less rate dependent with lesser amounts of localization. A new theory is formulated relating orientation in a shear band to intrinsic material properties obtained from true-stress true-strain tests. A kinematic limit for orientation within a shear band is also derived based on entanglement network parameters.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.H32.12