By linking Visual Basic with ANSYS,a software named AutoSIFA is compiled to calculate the stress intensity factor(SIF) of the semi-elliptical surface crack automatically and conveniently.

Finite element analysis for stress intensity factor of semi-elliptical surface crack in circular tube under torsion and bending;

In order to determine the stress intensity factors (SIFs) for a semi-elliptical surface crack at the T-root groove of a turbine disc under centrifugal forces, three-dimensional finite element method was employed to solve the displacement field of the cracked disc.

The major researches as follows:(1) The surface fracture was studied for Zirconia / Ni-Cr alloy FGMs strip with a semi-elliptical surface crack subjected to the thermal shock load, and studied the influence of crack depth, aspect ratios and thermal boundary conditions on the normalized stress-intensity factors along a crack-front.

Weighted function is obtained for an elliptical crack subjected to an elliptical symmetrical load in an infinite solid.

With the model of an oblique crack, the failure law of an elliptical crack in brittle materials under compressive loading is studied here by using the method of combining the theoretical analysis with experiments.