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Journal of Applied Physics : Particle size effect on strength, failure, and shock behavior in polytetrafluoroethylene-Al-W granular composite materials

By E. B. Herbold, V. F. Nesterenko, D. J. Benson, J. Cai, K. S. Vecchio et al

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Book Id: WPLBN0002169404
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 17 November 2008

Title: Journal of Applied Physics : Particle size effect on strength, failure, and shock behavior in polytetrafluoroethylene-Al-W granular composite materials  
Author: E. B. Herbold, V. F. Nesterenko, D. J. Benson, J. Cai, K. S. Vecchio et al
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Journal of Applied Physics Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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Herbold, V. F. Nesterenko, D. J. Benson, J. Cai, K. S. Vecchio Et A, E. B. (n.d.). Journal of Applied Physics : Particle size effect on strength, failure, and shock behavior in polytetrafluoroethylene-Al-W granular composite materials. Retrieved from http://hawaiilibrary.net/


Description
Description: The variation of metallic particle size and sample porosity significantly alters the dynamic mechanical properties of high density granular composite materials processed using a cold isostatically pressed mixture of polytetrafluoroethylene (PTFE), aluminum (Al), and tungsten (W) powders. Quasistatic and dynamic experiments are performed with identical constituent mass fractions with variations in the size of the W particles and pressing conditions. The relatively weak polymer matrix allows the strength and fracture modes of this material to be governed by the granular type behavior of agglomerated metal particles. A higher ultimate compressive strength was observed in relatively high porosity samples with small W particles compared to those with coarse W particles in all experiments. Mesoscale granular force chains of the metallic particles explain this unusual phenomenon as observed in hydrocode simulations of a drop-weight test. Macrocracks forming below the critical failure strain for the matrix and unusual behavior due to a competition between densification and fracture in dynamic tests of porous samples were also observed. Numerical modeling of shock loading of this granular composite material demonstrated that the internal energy, specifically thermal energy, of the soft PTFE matrix can be tailored by the W particle size distribution.

 

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