A Fourth-Order Block-Grid Method for Solving Laplace's Equation on a Staircase Polygon with Boundary Functions in 𝐶^𝑘,𝜆

Table 6

The stress intensity factor 𝜏^𝜖_1,𝑛 for 𝑛=70,170,200 when 𝜀=5×10⁻¹³.

ℎ^−1	𝜏^𝜀1,70	𝜏^𝜀1,170	𝜏^𝜀1,200
16	1.000000014856688	1.000000017180415	1.000000017197438
32	1.000000005800844	1.000000001230267	1.000000001236709
64	1.000000004138169	1.000000000073107	1.000000000079938
128	1.000000004053153	1.000000000003531	1.000000000003267