Paper Information

Journal:   JOURNAL OF SCIENCE AND TECHNOLOGY OF COMPOSITES (JSTC)   SEPTEMBER 2016 , Volume 3 , Number 2; Page(s) 165 To 176.
 
Paper: 

EXPERIMENTAL, ANALYTICAL AND NUMERICAL INVESTIGATION OF POLYPROPYLENE NANOCOMPOSITES MICROHARDNESS

 
 
Author(s):  PAYANDEHPEYMAN JAVAD, MAJZOOBI GHOLAMHOSSEIN*, BAGHERI REZA
 
* DEPARTMENT OF MECHANICAL ENGINEERING, BU-ALI SINA UNIVERSITY, HAMEDAN, IRAN
 
Abstract: 

In the present paper, the effects of nanoclay and nano calcium carbonate on polypropylene nano composites micro hardness are assessed using Vickers test. Also, a 3D finite element model of Vickers test has been simulated by Abaqus code to compare to the experimental results. The Drucker-Prager yield criterion has been used to predict the polymeric composite plastic deformation. The Drucker-Prager parameters implemented in the numerical model are determined by a tension and a compression test separately. Two associative and non-associative plastic flow assumptions are considered and an appropriate dilation angle is derived by minimizing the error difference of experimental and the numerical results. Furthermore, micromechanical and macromechanical models are investigated to predict nanoparticles effect on the polypropylene microhardness. Although the results show that analytical models including Marsh and rule of mixture models have suitable accuracy (about 10% error), excellent results (less than 2% error) can be obtained by selecting appropriate dilation angle value in the numerical method. Moreover, experimental evidences show that adding nanoclay and nano calcium carbonate increases elastic modulus, tensile and compressive yield stress as well as microhardness of the polypropylene.

 
Keyword(s): VICKERS MICROHARDNESS, DRUCKER-PRAGER CRITERION, MICROMECHANIC MODEL, MACROMECHNIC MODEL, POLYPROPYLENE, NANOCOMPOSITES
 
References: 
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