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Relationship between Crack Velocity and Fracture Surface Marks in a Sheet Specimen of UP and PMMA : Results of the Large Size Specimen Having a Central Crack

Memoirs of the Faculty of Engineering, Yamaguchi University Volume 39 Issue 2 Page 361-369
published_at 1989-03
KJ00000156739.pdf
[fulltext] 736 KB
Title
UP および PMMA 板材試片のき裂伝ぱ速度と破面模様 : 大型中央き裂付き試片の結果
Relationship between Crack Velocity and Fracture Surface Marks in a Sheet Specimen of UP and PMMA : Results of the Large Size Specimen Having a Central Crack
Creators Takimoto Akio
Creators Yoshimura Yuji
Creators Oda Naoki
Creators Fujii Toshio
Source Identifiers
We have reported that both-ends-closed marks (BECM) like an ellipse and one-end-opened marks (OEOM) like a parabola or a hyperbola are observed in a fracture surface of unsaturated polyester (UP) resin. The total number of them and the competition of their densities in a specimen change with fracture strength, crack velocity and a primary crack length introduced. We have also reported that fracture surface marks observed in a polymethyl methacryate (PMMA) specimen are mostly one-end-opened marks and the total number in a specimen is controlled by fracture strength, crack velocity and a primary crack length introduced. Here, we compared the both results in UP and PMMA where the specimen design and dimensions are exactly same. In both cases the cracks are shown to propagate in three different conditions of a constant stress, a mixed and a constant strain and fracture strength decreases with an increase of the central primary crack length. It is discussed if the number of marks are mainly controlled by fracture strength of a specimen or by the mean crack velocity of it.
Subjects
機械工学 ( Other)
Languages jpn
Resource Type departmental bulletin paper
Publishers 山口大学工学部
Date Issued 1989-03
File Version Version of Record
Access Rights open access
Relations
[ISSN]0372-7661
[NCID]AN00244228
Schools 工学部