\(a_{0}\) |
initial crack length |
\(A_{1}\), \(A_{2}\), \(n\)
|
material constants related to strain
hardening |
\(B\) |
thickness of specimen |
\(c\) |
sound speed in incident bar |
\(c_{1}\) |
experimental constant |
\(C\), \(p\)
|
material constant related to strain-rate
hardening |
\(D\) |
displacement of incident bar end initially in contact with
specimen |
\(E\) |
elastic modulus |
\(F_{Q}\) |
load at intersection point of load-deflection curve and line
OFd
|
\(J\) |
J-integral |
\(J_{\text{Id}}\) |
dynamic fracture toughness |
\(K_{1}\) |
experimental constant |
\(K_{I}\) |
stress intensity factor |
\(K_{\text{IC}}\) |
static fracture toughness |
\(K_{\text{Id}}\) |
dynamic fracture toughness |
\({\dot{K}}_{\text{Id}}\) |
loading rate |
\(K_{\text{Id}}^{r}\) |
reference fracture toughness
value |
\({\dot{K}}_{\text{Id}}\) |
reference loading rate |
\(K_{\text{rd}}\) |
ratio of stress intensity factor at crack tip to
dynamic fracture toughness of material |
\(L_{\text{rd}}\) |
ratio of loading condition assessed for plastic
limit load of structure
\(L_{\text{rd}}=\frac{\sigma_{\text{ref}}}{\sigma_{\text{yd}}}\)
|
\(\text{L\ }_{\text{rd}}^{\max}\) |
cut-off value of
Lrd
|
\(L\) |
length of specimen |
\(P_{\max}\) |
peak load |
\(S\) |
span of specimen |
\(t_{d}\) |
propagating time of strain wave from crack tip to position
of strain gauge |
\(t_{f}\) |
crack initiation time |
\(t_{p}\) |
time corresponding to peak strain signal |
\(W\) |
width of specimen |
\(\varepsilon_{\text{eq}}\) |
equivalent strain |
\({\dot{\varepsilon}}_{\text{eq}}\) |
equivalent strain
rate |
\(\varepsilon_{i}\) |
incident strain |
\(\varepsilon_{r}\) |
reflected strain |
\(\sigma_{\text{eq}}\) |
equivalent stress |
\(\sigma_{\text{ref}}\) |
reference stress |
\(\rho\) |
density of incident bar |
\(\upsilon\) |
Poisson’s ratio |