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A direct estimate of J Ic from the load versus load‐line displacement record
Author(s) -
PEHRSON B. P.,
LANDES J. D.
Publication year - 2007
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.1460-2695.2006.01046.x
Subject(s) - fracture toughness , displacement (psychology) , structural engineering , point (geometry) , fracture (geology) , mathematics , value (mathematics) , r value (soils) , line (geometry) , fracture mechanics , omega , materials science , composite material , statistics , geometry , engineering , physics , psychotherapist , psychology , subgrade , quantum mechanics
The purpose of this study is to examine the current standard fracture toughness test procedure to determine if there could be an easier method to get a J Ic value from the test record. The current method for determining J Ic involves a detailed computational and construction procedure. The objective in this study is to simplify the analysis for the determination of J Ic . The results of this study show that the load and displacement record for a fracture toughness test can be used to directly estimate a J Q value, a provisional value for fracture toughness, J Ic . The J value taken at the maximum load point can be used along with an adjustment factor to estimate a J Q value. This J Q estimate is close to the one obtained from the construction procedure of ASTM Standard E 1820. When a unit‐sized specimen is tested, that is, a specimen with a width of 50 mm and a thickness of 25 mm the maximum load point provides a direct estimate of J Q . Other sizes require a size adjustment factor, which is simply a square root relationship between the width of the test specimen and a unit width. The proposed new method of estimating J Q is simple in concept and requires a minimum number of calculations. It appears to produce values of J Q which are comparable to those obtained from the ASTM E1820 construction procedure and may produce less scatter.