Fig. 23: Comparison of envelope curves with different φ and l = 1.0, 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_Ee (Eq. 60) of the elastic energy integral due to the given enrichment function (Eq. 59) (the max. expected error) with respect to the number of integration points is shown for different φmax (0.5,0.9,0.995). The displacement field is not numerically calculated by the means of FE given. 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_23_data_1.csv:  φmax=0.995, centred crack (solid lines)
file fig_23_data_2.csv:  φmax=0.9, centred crack (solid lines)
file fig_23_data_3.csv:  φmax=0.5, centred crack (solid lines)

file fig_23_data_4.csv:  φmax=0.995, shifted crack (dashed lines)
file fig_23_data_5.csv:  φmax=0.9, shifted crack (dashed lines)
file fig_23_data_6.csv:  φmax=0.5, shifted crack (dashed lines)