Fig. 26From: On the construction of approximation space to model discontinuities and cracks with linear and quadratic extended finite elementsConvergence analysis for vectorial and scalar enrichments with a crack orientation at \(44.9{^{\circ }}\). Both enrichments have optimal convergence order but error levels are quite high. Results are in accordance with the ones of Fig. 22 and X-FEM is more accurate than GFEMBack to article page