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Investigation of the Constitutive Model of W/PMMA Composite Microcellular Foams

1
State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122# Luoshi Road, Wuhan 430070, China
2
Hubei Key Lab of Theory and Application of Advanced Materials Mechanics, Department of Mechanics and Engineering Structure, Wuhan University of Technology, 122# Luoshi Road, Wuhan 430070, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(7), 1136; https://doi.org/10.3390/polym11071136
Received: 10 June 2019 / Revised: 25 June 2019 / Accepted: 26 June 2019 / Published: 3 July 2019
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Abstract

Investigating the constitutive relationship of a material can provide better understanding of the mechanical properties of a material and has an irreplaceable effect on optimizing the performance of a material. This paper investigated a constitutive model for tungsten/polymethyl-methacrylate (W/PMMA) composite microcellular foams prepared by using melt mixing and supercritical carbon dioxide foaming. The stress-strain relationships of these foams with different W contents were measured under static compression. The elastic modulus and compressive strength values of the foams were remarkably greater than those of the pure PMMA foams: at a W content of 20 wt %, these values were increased by 269.1% and 123.9%, respectively. Based on the Maxwell constitutive model, the relevant coefficients were fitted according to the experimental data of different relative densities and W contents in quasi-static compression. According to the numerical relationships between the relevant coefficients and the relative densities and W contents, the quasi-static mechanical constitutive model of W/PMMA composite microcellular foams with W contents of 0~60 wt % and relative densities of 0.15~0.55 were predicted. This study provided basic data for the optimal design of the W/PMMA composite microcellular foams and proposed a method for investigating the mechanical properties of composite microcellular foam materials. View Full-Text
Keywords: composite material; microcellular foam; constitutive model; data fitting; parameter identification composite material; microcellular foam; constitutive model; data fitting; parameter identification
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Zhu, Y.; Luo, G.; Zhang, R.; Liu, Q.; Sun, Y.; Zhang, J.; Shen, Q.; Zhang, L. Investigation of the Constitutive Model of W/PMMA Composite Microcellular Foams. Polymers 2019, 11, 1136.

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