Premium
On the fitting and extrapolation of J ‐resistance data derived through the linear normalization technique
Author(s) -
TARPANI J. R.,
BOSE FILHO W. W.,
SPINELLI D.
Publication year - 2003
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 - 10.1046/j.1460-2695.2003.00597.x
Subject(s) - extrapolation , charpy impact test , normalization (sociology) , logarithm , tearing , power law , logarithmic scale , mathematics , curve fitting , mathematical analysis , materials science , ultimate tensile strength , statistics , physics , composite material , sociology , anthropology , acoustics
In this paper, an assessment is made regarding the effects of J – R curve fitting and extrapolation methods in two J ‐integral criteria – namely crack initiation, J i , and tearing instability, J 50 – which were obtained through the linear normalization technique. Power‐law, logarithmic and linear fits were concurrently applied to J– Δ a data derived from sub‐sized compact tensile specimens machined from a nuclear grade steel and tested at 300 °C. Research results show that the logarithmic J – R fit is the most conservative approach within a broad range of elastic–plastic fracture resistance, compared to the conventional power‐law fit. On the other hand, the linear fitting method provided the most non‐conservative J ‐predictions. The values of J i and J 50 have been successfully correlated with the net energy absorbed during Charpy impact testing of the materials.