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AN EGF EXERCISE IN PREDICTING DUCTILE INSTABILITY: PHASE 2, CRACKED PRESSURE VESSEL
Author(s) -
Milne I.,
Knee N.
Publication year - 1986
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.1460-2695.1986.tb00451.x
Subject(s) - pressure vessel , fracture toughness , structural engineering , materials science , fracture mechanics , instability , toughness , mechanics , plasticity , engineering , composite material , physics
This report discusses the results of a collaborative European Group on Fracture exercise to predict the pressure‐crack size relationships of an experimental cracked pressure vessel which was undergoing tests for the CEGB. The details of the test and background mechanical properties data had been circulated to interested parties with a request for predictions to be returned prior to the vessel test results being published. The results of this exercise are described here, analysed in detail and compared with the test results. Collectively, eighteen individuals provided thirty eight different estimates of the vessel behaviour. The procedures used included R6 and variants of it, crack tip opening displacement approaches, engineering J design curve approaches, simple plastic collapse criteria and the GE J estimation scheme. Analysis of the predictions showed that: (1) in the prediction of maximum pressures, the plastic limit pressure was important; (2) in the prediction of initiation pressures the initiation toughness dominated; (3) the detailed form of the resistance curve had little influence on either the crack growth predictions or the maximum pressure predictions. (4) all forms of failure assessment diagram based upon the R6 axes were capable of producing accurate predictions. (5) where a poor model was used to represent the cracked section the results were unsatisfactory.