Plastic deformation kinetics for glassy polymers and blends

1991 ◽  
Vol 269 (5) ◽  
pp. 460-468 ◽  
Author(s):  
S. N. Rudnev ◽  
O. B. Salamatina ◽  
V. V. Voenniy ◽  
E. F. Oleynik
Keyword(s):  
Plastic Deformation ◽  
Glassy Polymers ◽  
Deformation Kinetics

Hard and Soft: Principles of Polyner-Impregnated Concrete Using Elastomers

2013 ◽  
Vol 687 ◽  
pp. 118-123 ◽  
Author(s):  
Oliver Weichold ◽  
Udo Antons
Keyword(s):  
Plastic Deformation ◽  
Fracture Mechanics ◽  
Brittle Failure ◽  
Elastic Moduli ◽  
Domain Size ◽  
Glassy Polymers ◽  
Crack Deflection ◽  
Micro Cracks ◽  
Concrete Interface ◽  
Crystalline Matrix

The effect of incorporating elastomeric domains in concrete is described from the point of fracture mechanics. Concrete is subject to brittle failure, since cracks propagate at an enormous speed in the crystalline matrix. However, micro cracks are attracted to volume elements with lower elastic moduli such as elastomeric domains. Cracks that encounter the concrete-elastomer interface are stopped since energy is dissipated by plastic deformation of and/or crack deflection by the elastomer. The domain size and the distribution of the elastomer as well as, and properties of the elastomer-concrete interface are crucial parameters. Such a combination differs substantially from previously prepared polymer-impregnated concretes, in which only glassy polymers were used.

Plastic Deformation of Glassy Polymers: Correlation Between Shear Activation Volume and Entanglement Density

2002 ◽  
Vol 734 ◽  
Author(s):  
Janet Ho ◽  
Leon Govaert ◽  
Marcel Utz
Keyword(s):  
Plastic Deformation ◽  
Plane Strain ◽  
Activation Volume ◽  
Shear Zones ◽  
Glassy Polymers ◽  
Strain Rates ◽  
Plastic Shear ◽  
Elementary Processes ◽  
Entanglement Density ◽  
Phenylene Oxide

ABSTRACTThe shear activation volumes of miscible polystyrene-poly(2,6-dimethyl-1,4-phenylene oxide) (PS-PPO) blends at different PS-PPO ratios were determined experimentally by both plane strain and uniaxial compression at constant strain rates. We find that the same correlation between the shear activation volume and the entanglement density ρe holds for the blend as well as for various pure glassy polymers: . Since the shear activation volume is closely related to the size of the plastic shear zones, this correlation suggests that the cooperativity of the elementary processes of plastic deformation in glassy polymers scales with the entanglement density.

Plastic deformation in glassy polymers by atomistic and mesoscopic simulations

1995 ◽  
Vol 39 (2) ◽  
pp. 377-399 ◽  
Author(s):  
A. S. Argon ◽  
V. V. Bulatov ◽  
P. H. Mott ◽  
U. W. Suter
Keyword(s):  
Plastic Deformation ◽  
Glassy Polymers ◽  
Mesoscopic Simulations

Plastic Deformation Kinetics of 95.5Sn4Cu0.5Ag Solder Joints

1995 ◽  
Vol 117 (2) ◽  
pp. 100-104 ◽  
Author(s):  
Z. Guo ◽  
Yi-Hsin Pao ◽  
H. Conrad
Keyword(s):  
Plastic Deformation ◽  
Shear Stress ◽  
Shear Rate ◽  
Solder Joints ◽  
Deformation Kinetics ◽  
Constant Shear ◽  
Controlling Mechanism ◽  
Deformation Equation ◽  
Kinetics Of ◽  
Constant Shear Rate

The plastic deformation kinetics of 95.5Sn4Cu0.5Ag solder joints were determined in monotonic loading shear over the temperature range of 25°–150°C using three types of tests: (a) constant shear rate, (b) constant shear stress (creep), and (c) differential tests (changes in shear rate or temperature during an otherwise isothermal constant shear rate test). The deformation kinetics were evaluated in terms of the Dorn high temperature plastic deformation equation γ˙p=A(μb/kT)D(b/d)P(τ/μ)n where γ˙p is the shear rate, μ the shear modulus, b the Burgers vector, D the appropriate diffusion coefficient, d the grain size and τ the shear stress. A, p, and n are constants whose values depend on the rate controlling mechanism. It was found that n increased with stress from ~4 at 2 MPa to ~20 at 25 MPa, relatively independent of temperature. The activation ΔH was determined to be 21.1 ± 2 kcal/mole. The constant A, however, decreased with temperature from a value of ~1018 at 25°C to ~1010 at 150°C. The values of n and ΔH suggest that dislocation glide and climb is the rate controlling mechanism and hence that p ≈ 0. It is speculated that the large decrease in A with temperature may be the result of an effect on the microstructure.

Effect of intermolecular interactions on the plastic deformation of glassy polymers

Polymer ◽  
1996 ◽  
Vol 37 (7) ◽  
pp. 1177-1181 ◽  
Author(s):  
Masaru Ishikawa ◽  
Yoko Sato ◽  
Hiroaki Higuchi
Keyword(s):  
Plastic Deformation ◽  
Intermolecular Interactions ◽  
Glassy Polymers

Plastic deformation kinetics of fine-grained alumina

1999 ◽  
Vol 30 (11) ◽  
pp. 2809-2816 ◽  
Author(s):  
J. Campbell ◽  
Y. Fahmy ◽  
H. Conrad
Keyword(s):  
Plastic Deformation ◽  
Fine Grained ◽  
Deformation Kinetics ◽  
Kinetics Of

Indentation model and strain gradient plasticity law for glassy polymers

1999 ◽  
Vol 14 (9) ◽  
pp. 3784-3788 ◽  
Author(s):  
David C. C. Lam ◽  
Arthur C. M. Chong
Keyword(s):  
Plastic Deformation ◽  
Strain Gradient ◽  
Glassy Polymer ◽  
Glassy Polymers ◽  
Strain Gradient Plasticity ◽  
Molecular Theory ◽  
Indentation Hardness ◽  
Gradient Plasticity ◽  
Strain Gradients

Plastic deformation of metals is generally a function of the strain. Recently, both phenomenological and dislocation-based strain gradient plasticity laws were proposed after strain gradients were experimentally found to affect the plastic deformation of the metal. A strain gradient plasticity law is developed on the basis of molecular theory of yield for glassy polymers. A strain gradient plasticity modulus with temperature and molecular dependence is proposed and related to indentation hardness. The physics of the strain gradient plasticity in glassy polymer is then discussed in relation to the modulus.

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