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Analysis of the notch tip damage zone in biaxially oriented polypropylene
Author(s) -
Snyder J.,
Hiltner A.,
Baer E.
Publication year - 1994
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1994.070520210
Subject(s) - perpendicular , materials science , composite material , polypropylene , delamination (geology) , stress (linguistics) , tension (geology) , stress concentration , cylinder stress , geometry , fracture mechanics , ultimate tensile strength , geology , paleontology , linguistics , philosophy , mathematics , subduction , tectonics
The circular notch tip damage zone in biaxially oriented polypropylene has been analyzed using a thickness correction to the elastic stress distribution for a sharp‐notched tension specimen. The size and shape of the damage zone as a function of applied stress followed a critical mean stress criterion, independent of specimen thickness. Also, the damage zone only grew while σ 3 was greater than zero. Close observations of sections through the damage zone revealed that the circular zone, which consisted of many delamination crazes, had a distinctive pattern when viewed across the thickness difection. Large crazes grew into a triangular pattern with smaller crazes in between them. The shape developement of the triangular profile as well as the smaller crazes was explained using a stress‐redistribution argument. The growth path of the delamination crazes in the x‐z plane appeared to be in a direction perpendicular to the direction of σ 3 . © 1994 John Wiley & Sons, Inc.