1978 Volume 47 Issue 1 Pages 26-30
Variation of the absorbed energies and shear fracture appearances associated with the change of the width and the depth under the notch in Charpy impact test were investigated on Al-killed steel in the tem-perature range from -70°C to 20°C. The results obtained are summarized as follows;
(1) The clear transition curve of absorbed energy could not be observed when decreasing the width and the depth under notch of specimens.
(2) The energy peak in the range from -60°C to -40°C appeared for specimens of the depth under notch, h=2-4 mm, regardless of their width.
(3) The shear fracture appearance of the specimens of 10 mm in width showed the tendency of a little in-crease when the depth under notch decreased from 8 mm to 4 mm, but its precise measurement was impossible for specimens of the depth under notch of 2 mm.
(4) Describing here the absorbed energy by E=ChmWn, the exponent m was roughly 1.3-1.6 and showed a little but not remarkable dependence temperature for longitudinal specimens. On the other hand, it decreased sharply in the range from -40°C to 20°C for transverse specimens and that range seemed to correspond to the temperature range of υTrs.
The exponent n was 0.9-1.1 and showed little dependence on the depth under notch and on the test temperature for both longitudinal and transverse specimens.