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Titolo:
Fatigue crack propagation mechanisms in poly(methyl methacrylate) by in situ observation with a scanning laser microscope
Autore:
Ishiyama, C; Asai, T; Kobayashi, M; Shimojo, M; Higo, Y;
Indirizzi:
Tokyo Inst Technol, Precis & Intelligence Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan Tokyo Inst Technol Yokohama Kanagawa Japan 2268503 anagawa 2268503, Japan
Titolo Testata:
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
fascicolo: 24, volume: 39, anno: 2001,
pagine: 3103 - 3113
SICI:
0887-6266(200112)39:24<3103:FCPMIP>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY METHYL-METHACRYLATE; MOLECULAR-WEIGHT PMMA; SORBED WATER; CRAZE FIBRILS; FRACTURE; STRESS; GROWTH;
Keywords:
poly(methyl methacrylate); striations; fatigue crack growth; in situ observation; scanning laser microscope; amorphous; crazing; fracture;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Ishiyama, C Tokyo Inst Technol, Precis & Intelligence Lab, Midori Ku, 4259Nagatsuta, Yokohama, Kanagawa 2268503, Japan Tokyo Inst Technol 4259 Nagatsuta Yokohama Kanagawa Japan 2268503
Citazione:
C. Ishiyama et al., "Fatigue crack propagation mechanisms in poly(methyl methacrylate) by in situ observation with a scanning laser microscope", J POL SC PP, 39(24), 2001, pp. 3103-3113

Abstract

Crack propagation tests were performed on an amorphous polymer, poly(methyl methacrylate), to investigate fatigue crack propagation mechanisms. A scanning laser microscope with a newly developed tensile testing machine was used to observe in situ crack propagation in compact-type specimens. A crackusually propagated within the craze located at the crack tip under both static and cyclic loading conditions. When a crack stably propagated into thecraze under static loading conditions, bright bands composed of the brokencraze were observed at the edges along the crack wakes. However, there were successive ridges and valleys in place of bright bands along the crack wakes under cyclic loading conditions. When stable fatigue cracks were propagated at the loading half-cycle in each cycle, new craze fragments appeared that were similar to the bright bands under static loading, However, the thickness of these fragments decreased in the following loading cycle, and a new valley was formed. This suggested that the valleys were formed by the contact between the fracture surfaces near the crack tip during unloading. Fatigue crack propagation is thought to be due to fibrils weakened by crack closure between fracture surfaces. (C) 2001 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 13:03:59