Analysis of the Block-Grid Method for the Solution of Laplace's Equation on Polygons with a Slit

Table 5

The error of the stress intensity factor for fixed 𝑛=140.

ℎ^−1	|𝜎2−𝜎|	|𝜎6−𝜎|
16	3.4791×10^−6	3.7655×10^−10
32	3.0364×10^−6	1.9451×10^−12
64	1.4899×10^−8	5.9952×10^−15