標題: COEXISTENCE OF DUCTILE, SEMI-DUCTILE, AND BRITTLE FRACTURES OF POLYCARBONATE
作者: CHANG, FC
CHU, LH
交大名義發表
應用化學系
National Chiao Tung University
Department of Applied Chemistry
公開日期: 25-Mar-1992
摘要: The ductile-brittle transition behavior of polycarbonate and methylmethacrylate-butadiene-styrene (MBS) elastomer modified polycarbonate has been investigated in terms of notch radius and temperature. At -40-degrees-C and 21-mil notch radius, polycarbonate fractures in three possible modes, ductile (25%), semi-ductile (50%), and brittle (25%). This semi-ductile mode fracture has never been reported previously with brittle characterization, but to a greater extent in localized shear yielding on the fracture surface and intermediate toughness. A two-dimensional fracture mode diagram in terms of temperature and notch radius has been constructed to interpret the observed phenomena. This diagram can also predict the existence of other conditions under which the triplet fracture modes may also occur. Another unstable zone has also been identified where the fracture occurs in either ductile mode or brittle mode over a broad temperature range, instead of the narrow temperature range typically observed for polycarbonate. A model based on the excessive precrack strain just below yielding due to the greater notch radius is proposed to explain such observed semi-ductile mode fracture.
URI: http://dx.doi.org/10.1002/app.1992.070440915
http://hdl.handle.net/11536/3481
ISSN: 0021-8995
DOI: 10.1002/app.1992.070440915
期刊: JOURNAL OF APPLIED POLYMER SCIENCE
Volume: 44
Issue: 9
起始頁: 1615
結束頁: 1623
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  1. A1992HE63900015.pdf