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APPLICATION OF A NORMALIZATION METHOD FOR DETERMINING J‐R CURVES IN GLASSY POLYMER PVC AT DIFFERENT CROSSHEAD SPEEDS
Author(s) -
Che M.,
Grellmann W.,
Seidler S.,
Landes J. D.
Publication year - 1997
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1997.tb00272.x
Subject(s) - crosshead , normalization (sociology) , materials science , composite material , glass fiber , sociology , anthropology
— A new single‐specimen testing method, the normalization method with the so‐called LMN calibration function, based on the load separation principle and function calibrations from an individual test record, was used to construct J‐R curves directly from load versus load‐line displacement records without any additional on‐line crack‐length monitoring equipment. The research was done on CT‐specimens of a glassy polymer PVC at different crosshead speeds ranging from 0.01 to 50 mm/min. The J‐R curves evaluated from the normalization method are in good agreement with those from the conventional multiple‐specimen testing method in the whole range of the tested crosshead speeds. The results demonstrated the applicability of the normalization method for developing J‐R curves at different crosshead speeds in PVC. The crack initiation J ‐integral values, J 0.2 , showed a two‐regime dependence on the crosshead speeds in the tested crosshead speed range.