Abstract
Fracture toughness test in full thickness is an essential part of structural steel certification and qualification of welding procedures for critical structures intended for low-temperature service. The material to be tested should be in a stress relieved state that closely relates to a straight shape of the fatigue precrack front. A lot of technological treatment procedures for specimens preparation have been experimentally tried and quantitatively calculated. This paper describes a part of these efforts in respect of applicability of increased cyclic asymmetry during precracking. This method appears useful to get a straight fatigue crack in base metal specimens as well.
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