Abstract
The effect of side grooves on ductile-brittle transition behaviour was studied in a mild steel by using COD test (for static crack initiation), V notched Charpy impact test (for reference) and press-notched Charpy test (for arrest of crack).
The results are as follows.
(1) Noticeable effect of side grooves on the critical COD was not recognized in the transition region.
(2) By depressing the plastic constraint transition, the side grooves raised the fracture appearance transition temperature of V notched Charpy test and the temperature where the critical COD increased steeply with temperature.
(3) By depressing formation of shear lip, the side grooves raised slightly the fracture appearance transition temperature of press-notched Charpy test.
