Structural Evolution of a Stamping Reinforced Thermoplastic (SRT) in Both Extensional and Shearing Flows
Abstract
The axisymmetric flow of a polypropylene/long glass fibers SRT is analysed during isothermal or non-isothermal compression. SEM observations, uniaxial tension tests and measurements of the local weight fraction of glass reveal a circumferential orientation of the deep fibers under the effects of extensional strains, while at the surface shearing strains induce fiber rotation and breakage. Particular attention is paid to the shearing effects by means of a novel plane shearing device, showing strong shear-thinning of the material. A good agreement is found between the experimental data and a rheological calculation; a thermal transfert law shows a surface layer of congealed PP which depth grows as the square root of the compression rate.
Keywords
Shear Rate Uniaxial Tension Test Elongational Flow Extensional Strain Compression SpeedPreview
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