Shear Wave Attenuation and its Micro-Mechanism of Polymers

Zhi Ping Tang; Ting Li

doi:10.4028/www.scientific.net/AMM.446-447.249

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 446-447Shear Wave Attenuation and its Micro-Mechanism of...

Shear Wave Attenuation and its Micro-Mechanism of Polymers

Abstract:

The impact shear response of crystallized polypropylene under combined compression and shear loading was studied by using an inclined gas gun and electro-magnetic particle velocity gauges. The experimental results show that the transverse wave velocity increases nonlinearly with the impact velocity, indicating its shear behavior is strongly related to the hydrostatic pressure. Remarkable shear wave attenuation occurs near the impact surface when the impact velocity and inclination angle reach the critical value. The micro-observation of recovered samples with a polarized optical microscope reveals that there exists a melting layer of about 2-3μm thick, i.e. adiabatic shear failure layer, very near the impact surface (about 5μm) which causes the shear wave attenuation.

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Periodical:

Applied Mechanics and Materials (Volumes 446-447)

Pages:

249-253

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.446-447.249

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Online since:

November 2013

Authors:

Zhi Ping Tang, Ting Li

Keywords:

Adiabatic Shear Layer, Combined Compression, Polarized Micro-Observation, Polypropylene (PP), Shear Loading, Shear Wave Attenuation

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