Effects of sorbed water on crack propagation in poly(methyl methacrylate) under static tensile stress

Y. Bokoi, C. Ishiyama, Masayuki Shimojo, Y. Shiraishi, Y. Higo

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Effects of sorbed water on crack propagation in poly(methyl methacrylate) (PMMA) under static tensile stress have been investigated. The specimens were kept for more than two years in temperature and humidity-controlled conditions. Sorbed water of less than 0.40 wt% scarcely affected K/th value (threshold stress intensity factor for crack propagation), however, K/th value for the specimens containing water of more than 0.40 wt% increased with the amount of sorbed water. K/th values related to the balance among the radius of the curvature of crack tip, crazing stress and craze fibril rupture stress, which are functions of the amount of sorbed water. At a crack propagation rate of more than 1×10-7 m/s, the slopes of K-da/dt curves for the specimens containing water less than 0.40 wt% were gentle, however, that for the specimens containing more than 0.40 wt% was steep; and unstably fractured. It was found that the gentler slopes for the specimens containing little sorbed water may be caused by craze-shear controlled crack propagation mechanisms, while the steeper slopes for the other specimens may be caused by a craze controlled crack propagation mechanism.

Original languageEnglish
Pages (from-to)5001-5011
Number of pages11
JournalJournal of Materials Science
Volume35
Issue number19
DOIs
Publication statusPublished - 2000 Oct
Externally publishedYes

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Polymethyl Methacrylate
Polymethyl methacrylates
Tensile stress
Crack propagation
Water
Crazing
Stress intensity factors
Crack tips
Atmospheric humidity

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Effects of sorbed water on crack propagation in poly(methyl methacrylate) under static tensile stress. / Bokoi, Y.; Ishiyama, C.; Shimojo, Masayuki; Shiraishi, Y.; Higo, Y.

In: Journal of Materials Science, Vol. 35, No. 19, 10.2000, p. 5001-5011.

Research output: Contribution to journalArticle

Bokoi, Y. ; Ishiyama, C. ; Shimojo, Masayuki ; Shiraishi, Y. ; Higo, Y. / Effects of sorbed water on crack propagation in poly(methyl methacrylate) under static tensile stress. In: Journal of Materials Science. 2000 ; Vol. 35, No. 19. pp. 5001-5011.
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