θ

a (mm)

Theoretical K_It

Theoretical K_IIt

2D FEM K_I

2D FEM K_II

3D XFEM K_I

3D XFEM K_II

FEM K_I Error (%)

FEM K_II Error (%)

XFEM K_I Error (%)

XFEM K_I Error (%)

60˚

2.5

5.5384

9.5927

5.6705

9. 3240

5.3419

9.5059

2.385

−2.802

−3.546

−0.905

60˚

3.5

6.5531

11.3503

6.7093

11.0320

6.3208

11.2478

2.384

−2.800

−3.544

−0.903

60˚

4.4

7.3475

12.7263

7.5958

12.3681

7.0869

12.6108

2.380

−2.794

−3.548

−0.907

25˚

2.5

18.1968

8.4853

18.7099

8.2480

17.5601

8.4087

2.382

−2.796

−3.499

−0.908

55˚

2.5

7.2883

10.4088

7.4623

10.1164

7.0303

10.3153

2.388

−2.809

−3.539

−0.898

80˚

2.5

0.6680

3.7884

0.6839

3.3821

0.6443

3.7543

2.387

−2.807

−3.542

−0.901