The effect of chain structure on the annealing and deformation behaviour of polymers

Haward, R. N.; Hay, J. N.; Parsons, Ian W.; Adam, Georgius A.; Owadh, A. A. K.; Boxnyak, C. P.; Aref-Azaf, A.; Cross, Andrew

doi:10.1007/bf01384357

Cited by 43 publications

(15 citation statements)

References 68 publications

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“…Haward, 1980). In the BPA model, the effects of softening are described in terms of the evolution equation (2) of the athermal yield strength.…”

Section: Efects Ofmaterialpropertiesmentioning

confidence: 99%

Analysis of shear band propagation in amorphous glassy polymers

Giessen

1994

International Journal of Solids and Structures

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Abstract-Similar to the well-known neck propagation phenomenon, shearing of polymer materials often reveals the initiation and subsequent propagation of a shear band. Finite element analysis is used to numerically simulate large plane strain, simple shear tests, focussing attention on the initiation and propagation of the shear band. The mesh sensitivity and effects of initial imperfection, strain softening, orientation hardening, strain-rate as well as the edge effects are discussed in detail. It appears that the intrinsic softening is the driving force to promote initiation of the shear band and its propagation in the shear direction, while the orientation hardening is the driving force for widening of the shear band. The predicted numerical results are compared with experimental data for polycarbonate found in the literature.

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“…Haward, 1980). In the BPA model, the effects of softening are described in terms of the evolution equation (2) of the athermal yield strength.…”

Section: Efects Ofmaterialpropertiesmentioning

confidence: 99%

Analysis of shear band propagation in amorphous glassy polymers

Giessen

1994

International Journal of Solids and Structures

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“…Softening is considered to be the result of local flow induced dilation in the polymer [Haward, et a l . (18), Hasan and Boyce (1911 that is a characteristic feature of deforming amorphous media. Any fluctuations in local volume would affect the intermolecular bamers to deformation.…”

Section: Isotropic Resistancementioning

confidence: 99%

The effects of thermomechanical coupling on the cold drawing process of glassy polymers

Boyce

Montagut

Argon

1992

Polymer Engineering & Sci

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The source and the effects of strain-induced heating on the stress-strain behavior and corresponding cold drawing process of glassy polymers are investigated. The nature of dissipative and stored components of work are discussed where only 50 to 80% of the mechanical work of glassy polymers has been found to be dissipative. This phenomenon is demonstrated to be well-modeled by considering a portion of the work to be stored as strain-induced molecular orientation in the polymer that evokes a back stress tensor. The results of the modeling are found to be consistent with experimental measurements reported in the literature. The constitutive and corresponding heat generation model are used in fully thermomechanically coupled finite element analysis of the cold drawing of glassy polymers. The influence of applied elongation rate on the resulting temperature rise, heat transfer, thermal softening, and fiber geometry are presented, together with a full complement of the deformation field parameters related to the propagating shoulders of the drawn neck.

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“…C 1 = 16 and C 2 = T g À T 0 = 50°C are the well known coefficients of the WLF law for polymer fragile glasses. [15] for a series of polyesters and copolymers (see Fig. 22 of their reference).…”

Section: Kinetics Of the Enthalpy Relaxationmentioning

confidence: 99%

Aging of oriented polymer glasses

Rault

2006

Journal of Non-Crystalline Solids

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The effect of chain structure on the annealing and deformation behaviour of polymers

Cited by 43 publications

References 68 publications

Analysis of shear band propagation in amorphous glassy polymers

Analysis of shear band propagation in amorphous glassy polymers

The effects of thermomechanical coupling on the cold drawing process of glassy polymers

Aging of oriented polymer glasses

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