The Effect of Strain Rate on the Tensile Properties of PMMA/Hydroxyapatite Composite

Document Type : Research Paper

Authors

1 Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran

2 Department of Materials Science and Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran

Abstract

To investigate the effect of the different content of hydroxyapatite (HA) (5, 10, and 15 wt.%) on the tensile properties and deformation mechanism of the poly‏ methylmethacrylate (PMMA), tensile test at different strain rate (4.1×10-4, 8.3×10-4,1.66×10-3, 3.31×10-3, 8.275×10-3, and 16.6×10-3 s-1), microscopic evaluations were performed on the standard samples. The results of the tensile test showed that by adding HA to the PMMA, its strain rate sensitivity increased. The activation energy (ΔH) for chain fluctuation decreased from 56.42 to 37.81 J/mol as HA content increased from 0 to 15 wt.%. In addition, the active volume ( ) of the chain during the tensile test was measured indicating that its value decreased from 3.02 to 2.35 as HA content promoted from 0 to 15 wt.%. The results of microscopic evaluation showed that the deformation mechanism of PMMA during the tensile test was crazing and dispersity of craze depended strongly on the HA content.

Keywords

References

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Iranian Journal of Materials Forming
Volume 10, Issue 2
April 2023
Pages 35-43

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