Abstract
A test was conducted at low temperature using notched tension plate specimens in order to investigate the influence of notch geometry and plate thickness on fracture stress and critical crack opening displacement. The following results were obtained.1) Fracture stress and critical COD of welded specimens are lower than, those of base metal specimens.2) Fracture stress clearly comes under the effect of plate thickness in region below transient temperature and critical COD also comes clearly under the effect of plate thickness except notch type C.3) Fracture stress and critical COD of notch type B are lowest and so it is proposed that notch geometry of standard specimen of DEEP NOTCH TEST be substituted by notch type B.
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