Fig. 19: Comparison of envelope curves with l/h = 1.0, kφ = 0.002 and different maximum phase-field φmax, Quadrature: 1 GP per subelement; centred crack: solid lines, shifted crack: dashed lines
 
Here, the upper values (envelope curves) of the point data of the numerical quadrature error e^int_Γlς (Eq. 58) of the crack surface integral (the max. expected error) with respect to the number of integration points is shown for different  φmax (1,0.9995,0.95). The phase-field is not numerically calculated by the means of FE but the stabilised phase-field is given (φς) as well as the analytical solution (φ). The solid lines refer to a given crack in the middle of the bar and the dashed lines refer to a given crack at a off-center position. 

for each file -> Columns
1: number of integration points 
2: error 

file fig_19_data_1.csv: φmax=0.95, centred crack (solid lines)
file fig_19_data_2.csv: φmax=0.9995, centred crack (solid lines)
file fig_19_data_3.csv: φmax=1.0, centred crack (solid lines)

file fig_19_data_4.csv: φmax=0.95, shifted crack (dashed lines)
file fig_19_data_5.csv: φmax=0.9995, shifted crack (dashed lines)
file fig_19_data_6.csv: φmax=1.0, shifted crack (dashed lines)