JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Evaluation of Brittle Fracture Initation Characteristeics by Means of V Charpy Impact Energy
Yukito HagiwaraIsao SayaKenichi MinamiMitsuo Sato
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1976 Volume 45 Issue 8 Pages 627-633

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Abstract

The correlation between V Charpy test and COD test is investigated for the structural steel with strength range from mild steel to HT80 including their weld zone. The results are summerized as follows:
(1) The transition temperature T*i of δc is defined as the temperature at which δci=0.16 mm. Temperature shift ΔT* between T*i and vTs is expressed as a function of yield strength at the room temperature and the plate thickness by the following relation.
ΔT*=vTs-T*i
=120-σY0-5(√t-√20) (1)
where ΔT*, T*i:(°C)
vTs:V Charpy 50% crystallinity transition temperature (°C)
σYo:yield stress at R.T. (kg/mm2)
t:plate thickness (mm)
(2) The relation between δc(T) and vE(T+ΔT*) is obtained for the vE transition range.
δc(T)=0.02vE(T+ΔT*) (2)
where δc(T):δc at T=T (mm)
vE(T+ΔT*):vE at T=T+ΔT* (kg-m)
For the upper shelf range of vE, δc can be estimated from Eq. (2) by using vE* value instead of VE.
Where vE* is defined by the following relation.
vE*=vE*0 exp (-T0/T) (3)
Ev*0 and T0 are material constants, which are determined empirically from the assumption that temperature dependence of vE in the transition range is of Arrhenius type, i.e., vE* is an extrapolated value of Eq. (3) to the upper shelf temperature of T.

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