Premium
Effect of strain rate on the fracture toughness of some ductile polymers using the essential work of fracture (EWF) approach
Author(s) -
Ching Emma C. Y.,
Poon Wendy K. Y.,
Li Robert K. Y.,
Mai YiuWing
Publication year - 2000
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11386
Subject(s) - materials science , fracture toughness , composite material , strain rate , acrylonitrile butadiene styrene , strain (injury) , plane stress , fracture (geology) , polyethylene , toughness , ultra high molecular weight polyethylene , structural engineering , medicine , finite element method , engineering
The plane strain fracture toughness of two ductile polymers, ultra high molecular weight polyethylene (UHMWPE) and acrylonitrile‐butadiene‐styrene (ABS), was measured by using the essential work of fracture approach. Truly plane strain fracture toughness ( w Ie ) was measured for ABS at quasi‐static and impact rates of loading. For UHMWPE, the measured values were only “near” plane strain values ( w Ie *). It was confirmed both w Ie * and w Ie were independent of specimen type but dependent on strain rate. For UHMWPE, there was a negative strain rate effect, i.e., w Ie * decreased with increasing loading rate. At low quasi‐static loading rate (v = 10 mm/min), w Ie * was constant at 55 kJ/m 2 . It then decreased to 15 KJ/m 2 when the loading rate was increased to 100 mm/min, and remained at that value even up to impact rate of loading ( v = 3.7 m/s). For ABS, a mild positive strain rate effect was observed. w Ie increased from 13 kJ/m 2 at v = 10 mm/min to 17 kJ/m 2 at v = 3.7 m/s.