Stress intensity factor in hollow square sections using extended finite element method

Abstract EN

Hollow sections are extensively used in structural applications due to its good mechanical properties relative to weight.

The presence of cracks in structural member may lead to catastrophic failure under different loading conditions.

The presence of central crack in one side under tensile load is studied for different crack sizes (a/w) ranging from 0.1 to 0.8.

The section is then investigated under bending moment for same crack size and geometry.

The values of stress intensity factor (KI) were evaluated using Extended Finite Element Method (XFEM) and found very close between tensile and bending for same crack sizes but there was a difference in the shape factor values.

The section is also investigated under tensile load but with the presence of edge crack with range of crack sizes (a/w) from 0.1 to 0.8.

The results showed that the stress intensity factor in edge crack is much higher than central crack for same geometry and under same loading condition.