Abstract
There are presently a magnitude of different fracture toughness testing
standards that have different criteria for fatigue pre-cracking
specimens prior to testing. The reason for the criteria is that too high
pre-fatigue load may influence the subsequently measured fracture
toughness value. The criteria have to a large extent been developed
specifically for each standard in question and this has lead to the
considerable variability in the criteria. The basic reason for the
pre-fatigue having an effect on the fracture toughness is the warm
pre-stress (WPS) effect. Here, existing data relating to pre-fatigue
load levels are examined with the help of a newly developed simple WPS
correction and a criteria and correction procedure for too high
pre-fatigue loads are proposed. The new criteria focuses on brittle
fracture, but is equally applicable for ductile fracture, thus enabling a
unification of pre-fatigue criteria in different fracture toughness
testing standards.
Original language | English |
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Pages (from-to) | 1737 - 1750 |
Number of pages | 14 |
Journal | Engineering Fracture Mechanics |
Volume | 71 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2004 |
MoE publication type | A1 Journal article-refereed |
Keywords
- fracture toughness testing
- pre-fatigue
- pre-cracking
- warm pre-stress
- master curve