Journal ArticleDOI
Mechanical anisotropy of oriented polymers
C. Bridle,A. Buckley,J. Scanlan +2 more
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TLDR
In this paper, a tensile and shear yield stress was measured on strips cut at various angles to the draw direction from films of drawn amorphous poly(ethylene terephthalate).Abstract:
Measurements of tensile and shear yield stress have been made on strips cut at various angles to the draw direction from films of drawn amorphous poly(ethylene terephthalate). The data were well fitted by a criterion of the von Mises type but with modifications to allow for the anisotropy of the samples and also for a built-in compressive stress in the draw direction. In the tensile experiments a sharp neck is usually formed at an angle to the tensile direction and this angle is predicted with good accuracy by an application of the theory of plastic potential.read more
Citations
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Journal ArticleDOI
Review: The yield behaviour of polymers
TL;DR: In this paper, a review of the yield behavior of polymers is presented, focusing on the importance of the hydrostatic component of stress, the viscoelastic nature of yield process, and the behaviour of oriented polymers.
Journal ArticleDOI
The strain-rate, temperature and pressure dependence of yield of isotropic poly(methylmethacrylate) and poly(ethylene terephthalate)
TL;DR: In this paper, a modification of a theory proposed by Robertson, which uses the internal viscosity approach to yield in glassy polymers, was shown to explain the temperature and strain-rate dependence of the yield stress and provides a quantitative explanation of the differences in behaviour between tension and compression in terms of the dependence of yield on the hydrostatic component of the applied stress.
Journal ArticleDOI
Hypothetical mechanism of crazing in glassy plastics
TL;DR: In this paper, the authors proposed a stress-activated devitrification of a small amount of material at the tip of a chance nick or flaw, to a softer rubbery state, and then cavitation of the softened material is then assumed to take place under the same dilatant stress responsible for its formation.
Journal ArticleDOI
The yield and thermoelastic properties of oriented poly(methyl methacrylate)
TL;DR: In this article, the degree of molecular orientation in oriented polymers was characterized by measuring birefringence, and specimens prepared for measurements of tensile yield stress and shrinkage stress at elevated temperature.
Journal ArticleDOI
Talc-thermoplastic compounds: particle orientation in flow and rheological properties
Chang Ho Suh,James L. White +1 more
TL;DR: In this paper, the orientation of talc particles in flow and the rheological properties of thermoplastic melts were investigated using a wide angle X-ray diffraction technique.
References
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Journal ArticleDOI
A theory of the yielding and plastic flow of anisotropic metals
TL;DR: In this article, a theory is suggested which describes the yielding and plastic flow of an anisotropic metal on a macroscopic scale and associated relations are then found between the stress and strain-increment tensors.
Book
Engineering Design for Plastics
TL;DR: The engineering design for plastics is universally compatible with any devices to read and is available in the book collection an online access to it is set as public so you can download it instantly.
Journal ArticleDOI
Stress-optical properties of amorphous polyethylene terephthalate fibres
P. R. Pinnock,I. M. Ward +1 more
TL;DR: The theoretical treatment of Kuhn and Grun has been employed to calculate the polarizability of the random link and the number of effective cross-links per molecular chain this article.
Journal ArticleDOI
Anisotropy in the shear modulus of glassy polymers
C. Bridle,A. Buckley,J. Scanlan +2 more