Quantification of Cavitation in Neat and Calcium Carbonate-Filled High-Density Polyethylene Subjected to Tension

[+] Author and Article Information
F. Addiego

J. Di Martino, D. Ruch

Department of Advanced Materials and Structures, Centre de Recherche Public Henri Tudor, 66 Rue de Luxembourg, L-4221 Esch-sur-Alzette, Luxembourg

A. Dahoun, O. Godard

Institut Jean Lamour,  Nancy-Université, Parc de Saurupt, F-54042 Nancy Cedex, France

S. Patlazhan

Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Kosygin Street 4, 119991 Moscow, Russia

J. Eng. Mater. Technol 133(3), 030904 (Jul 01, 2011) (7 pages) doi:10.1115/1.4004046 History: Received March 26, 2010; Revised March 04, 2011; Published July 01, 2011; Online July 01, 2011

Cavitation-induced deformation mechanisms in neat semicrystalline polymers, i.e., crazing, and in the derived composites, i.e., particle-matrix debonding, are generally activated during the transition between viscoelastic and viscoplastic deformation stages. However, little quantitative information about the void evolution with the drawing level is to date available in the literature. The objective of this work is to quantify cavitation mechanisms in neat and calcium carbonate-filled high-density polyethylene (HDPE) subjected to tensile deformation. Attention was first focused on the properties of the materials that were assessed by means of a thermogravimetric analyzer, a differential scanning calorimeter, a scanning electron microscope (SEM), and a dynamic mechanical analyzer. In a second step, macroscopic aspects of cavitation were studied by quantifying volume variation of the materials subjected to tension using an accurate optical extensometer (VidéoTraction). Attention was then turned to microscopic features of cavitation through a careful quantification of void density and shape factor by means of a method coupling a SEM with an image analysis procedure. At the two scales of interest, the results demonstrate that (i) the void density generated by crazing in neat HDPE or particle-matrix debonding in the composites gradually increases with the deformation state, (ii) void density induced by debonding is higher than that generated by crazing, and (iii) decreasing particles size causes an increase of void density. We also estimated the void shape factor, that is, ratio between the height and the width of the cavities. In all the studied materials, this parameter starts from a value that is below 1 and increases by a factor of 2 with increasing deformation. Moreover, in the case of the composites, one notes a higher void shape factor compared with the neat material, and particle size does not influence this parameter. The results provided by this paper can be the basis of a physically based model predicting cavitation mechanisms in semicrystalline polymers.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

PC-SEM micrographs of HDPE ((a) and (b)), m-CaCO3 /HDPE ((c) and (d)), and n-CaCO3 /HDPE ((e) and (f)) at undeformed ((a), (c) and (e)) and deformed ɛ33r ≈ 0.85 states ((b), (d), and (f)) (GAD detector, 6 kV, spot 4, 150 Pa)

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Figure 2

DSC thermograms of neat HDPE and the derived composites (10 K/min)

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Figure 3

DMA curves of neat HDPE and the derived composites (simple cantilever, 5 Hz, 10 K/min)

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Figure 4

Tensile behavior of neat HDPE and the derived composites (25 °C, 1.10−3 s−1 ), (a) true stress—true axial strain curve and (b) volume strain—true axial strain curve

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Figure 5

Volume strain—true axial strain of HDPE and the derived composites subjected to tension including unloading stages (25 °C, 1.10−3 s−1 )

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Figure 6

Image treatment of a PC-SEM micrograph of deformed HDPE (ε33r ≈ 0.85), (a) GAD micrographs taken after 12 s of electron irradiation (150 Pa, 6 kV, spot 4), (b) gray-level thresholding, and (c) elimination of noise

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Figure 7

Evolution with residual true axial strain, ε33r , of (a) cavity density, Sc /S, and (b) cavity shape factor, φ, for neat HDPE, m-CaCO3 /HDPE, and n-CaCO3 /HDPE



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