1976 Volume 45 Issue 8 Pages 627-633
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 δc=δi=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.
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.
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.