Fig. 17: Comparison of envelope curves with different kφ and l/h = 1.0, Quadrature: 1 GP per subelement; centred crack: solid lines, shifted crack: dashed lines
 
Envelope Curves of the data shown in Figure 16. Here, the upper values 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 kφ (0.001, 0.002, 0.004). 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_17_data_1.csv: kφ=0.001, centred crack (solid lines)
file fig_17_data_2.csv: kφ=0.002, centred crack (solid lines)
file fig_17_data_3.csv: kφ=0.004, centred crack (solid lines)

file fig_17_data_4.csv: kφ=0.001, shifted crack (dashed lines)
file fig_17_data_5.csv: kφ=0.002, shifted crack (dashed lines)
file fig_17_data_6.csv: kφ=0.004, shifted crack (dashed lines)