Internal Friction of Glassy Polycarbonate During Plastic Flow

Parisot, J.; Astier, J.P.; Fernández, Ana; Rafi, O.

doi:10.1051/jphyscol:1981587

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“…Ln(i2liJ = Ln(p/pd + (g -aJ/(ZA,) (9) We shall not study the kinetics of variation in this case but consider only the onset and the end of the transient. We can write from Eq.…”

Section: Effect Of Strain-rate: Determination Of Amentioning

confidence: 99%

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Analysis of deformation processes in glassy polycarbonate using internal friction measurements during a tensile test

Parisot

Rafi

Choi

1984

Polymer Engineering & Sci

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Internal friction has been measured by torsion at 1 Hz during tensile tests performed on glassy polycarbonate at room‐temperature. Steady‐state flow and transient effects have been studied during continuous tensile tests and strain‐rate changes. During steady‐state, internal friction and flow‐stress vary in a similar way with strain‐rate. But during transients, internal friction varies continuously while flow‐stress passes through a maximum (or a minimum). These results are interpreted assuming that non‐elastic deformation of glassy polymers requires some microscopic discontinuous processes such as motion of defects. Two parameters are considered: the velocity v and the density ρ of mobile defects. Assuming that the former is directly related to the flow stress, it has been shown that internal friction is related to the density of mobile defects ρ. This feature is used to interpret the different stages of a tensile test curve. Activation volumes for both velocity and density of mobile defects are calculated from experimental data.

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“…Ln(i2liJ = Ln(p/pd + (g -aJ/(ZA,) (9) We shall not study the kinetics of variation in this case but consider only the onset and the end of the transient. We can write from Eq.…”

Section: Effect Of Strain-rate: Determination Of Amentioning

confidence: 99%

“…This idea of mobile defects implies molecular mobility at the monomer unit level. It is known that internal friction is sensitive to this mobility and it has been shown in a previous paper [9] that internal ' Present address: Universitk CADI AYYAD, Dkpartement de Physique, MARRAK-ECH. Maroc.…”

Section: Introductionmentioning

confidence: 99%