lb 102[mm] Length
wb 25.4[mm] Width
hb 2*1.56[mm] Thickness
cl 34.1[mm] Initial crack length
pn 1e6[N/mm^3] Penalty stiffness
sigmat 80[MPa] Normal tensile strength
sigmas 100[MPa] Shear strength
Gct 0.969[kJ/m^2] Critical energy release rate, tension
Gcs 1.719[kJ/m^2] Critical energy release rate, shear
alpha 2.284 Exponent of the Benzeggagh and Kenane (B-K) criterion
disp 0 Displacement parameter
mm 0.5 Mode mixity ratio
ll lb/2*(0.5*sqrt(3*(1-mm)/mm)+1)/(3-0.5*sqrt(3*(1-mm)/mm)) Lever length
lr 8*((6*mm+sqrt(3*mm*(1-mm)))/(3+9*mm+8*sqrt(3*mm*(1-mm)))) Load ratio middle/cracked edge