Microstructural control of fatigue-crack growth in a brittle,two-phase polymer |
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Authors: | James Lankford William J Astleford Marc A Asher |
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Affiliation: | (1) Southwest Research Institute, San Antonio, Texas, USA;(2) University of Kansas Medical Center, Kansas City, Kansas, USA |
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Abstract: | Fatigue-crack propagation in a brittle, two-phase polymer important in bioengineering applications has been studied. It was found that the polymeric microstructure, although based on PMMA, enhances the fatigue-crack growth resistance of the composite polymer, in comparison with pure PMMA. This enhanced behaviour derives from several micromechanisms, i.e. (1) crack front pinning by constituent particles, (2) a reduction of the intrinsic PMMA crack growth rate within the partially polymerized MMA matrix, and (3) crack-tip wandering and energy absorption through microcrack nucleation at matrix voids lying within the path of the crack. |
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