3. Accuracy of Suggested Method

The extrapolation displacement method was validated on the test case (SSS?) , for which analytical solutions are known [3]. This test case, as detailed in (T1.odt), considers an elliptic crack in a three-dimensional body subject to a tensile load. A cube by size of \((h=w=t=16)\), containing a horizontal circular crack of radius \(c=a=1\) is considered (see Fig.2). The value of far-field stress, \(\mathrm{\sigma }\), was prescribed as 1 MPa. Due to symmetry, only one quarter of the elliptical crack is considered. The crack is meshed with fine quadratic mesh type in the vicinity of crack tip. The results are compared with reference solution (see Fig.3).

Fig.2Geometric configuration of the testcase shown in half symmetry []

Fig.3 T-stress compression