Fig. 24: Comparison of envelope curves with the different subelement quadrature schemes with l/h = 1.0 and φmax = 0.9; 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 a non fully developed crack for different quadrature schemes (1,2,3,4,6 GP per Subelement). 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_24_data_1.csv:  1 GP, centred crack (solid lines)
file fig_24_data_2.csv:  2 GP, centred crack (solid lines)
file fig_24_data_3.csv:  3 GP, centred crack (solid lines)
file fig_24_data_4.csv:  4 GP, centred crack (solid lines)
file fig_24_data_5.csv:  6 GP, centred crack (solid lines)

file fig_24_data_6.csv:  1 GP, shifted crack (dashed lines)
file fig_24_data_7.csv:  2 GP, shifted crack (dashed lines)
file fig_24_data_8.csv:  3 GP, shifted crack (dashed lines)
file fig_24_data_9.csv:  4 GP, shifted crack (dashed lines)
file fig_24_data_10.csv: 6 GP, shifted crack (dashed lines)