7.2 Impact Test on 10CrNi3MoV21A Armor Steel/SiC Ceramic/UHPCC …
211
Fig. 7.24 Comparisons
between the fitting curve of
JC constitutive model and
test data
σ = A(1 + C ln ˙
ε
∗
)
(7.6)
By substituting the value of A into Eq. (7.6), the relationship between the dynamic
yield strength obtained from the above SHPB test and ln ˙
ε
∗ is shown in Fig. 7.25.
The strain rate effect parameter C = 0.028 is therefore obtained by calculating the
slope of the linear fitting curve.
Furthermore, the thermal softening effect was investigated by carrying out the
quasi-static isothermal hot tensile tests. The expression of JC constitutive model
under reference strain rate (10
–3 s
−1 , ε = 0) can be simplified as
σ = A[1 − (T
∗
)
m
]
(7.7)
Fig. 7.25 Linear fitting of
the relationship between
dynamic yield strength and
ln ˙
ε ∗
211
Fig. 7.24 Comparisons
between the fitting curve of
JC constitutive model and
test data
σ = A(1 + C ln ˙
ε
∗
)
(7.6)
By substituting the value of A into Eq. (7.6), the relationship between the dynamic
yield strength obtained from the above SHPB test and ln ˙
ε
∗ is shown in Fig. 7.25.
The strain rate effect parameter C = 0.028 is therefore obtained by calculating the
slope of the linear fitting curve.
Furthermore, the thermal softening effect was investigated by carrying out the
quasi-static isothermal hot tensile tests. The expression of JC constitutive model
under reference strain rate (10
–3 s
−1 , ε = 0) can be simplified as
σ = A[1 − (T
∗
)
m
]
(7.7)
Fig. 7.25 Linear fitting of
the relationship between
dynamic yield strength and
ln ˙
ε ∗