Determination of J-R curve of polypropylene copolymers using the normalization method.
In: Journal of Materials Science, Jg. 36 (2001-03-15), Heft 6, S. 1487-1499
Online
academicJournal
Zugriff:
In this paper the applicability of the load normalization method to determine J- R curves of polypropylene copolymers (PP) is analyzed. This method allows the determination of resistance curves ideally from a single fracture test, and it is based on the load separation principle, which assumes that load can be separated in two multiplicative functions, the geometry function, G( a/ W), and the deformation function, H(ν pl / W), which depend of the crack depth and the plastic displacement, respectively. The load separation validity has been checked for two different PP copolymers (block and random copolymers) and the load normalization method has been applied in order to determine and analyze the resistance curves, which have been compared, as a reference, with those obtained by the multiple specimen method. The applicability of the load normalization method to PP copolymers is analyzed by introducing some variations in the general procedure: Firstly, the deformation function is determined using either a power law fit or the so-called LMN function. With the power law, two different fitting methods have been tested: the usual “6 + 1” method and a “6 + 6” method proposed here for giving more weight to the final point of the curve. Secondly, the influence of the material crack tip blunting has been analyzed quantifying it through different values of the constriction factor ( m) in the general expression of the blunting line. Finally, the effect of the separable blunting region extension on the J- R curve has been also analyzed by establishing different separable blunting zones. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Titel: |
Determination of J-R curve of polypropylene copolymers using the normalization method.
|
---|---|
Autor/in / Beteiligte Person: | Morhain, C. ; Velasco, J. I. |
Link: | |
Zeitschrift: | Journal of Materials Science, Jg. 36 (2001-03-15), Heft 6, S. 1487-1499 |
Veröffentlichung: | 2001 |
Medientyp: | academicJournal |
ISSN: | 0022-2461 (print) |
DOI: | 10.1023/A:1017500930544 |
Schlagwort: |
|
Sonstiges: |
|