ABAQUS Advanced use Element and Node Sets Shear

ABAQUS – Advanced use • • Element and Node Sets Shear Locking in solid elements Reduced Integration and Zero Energy Modes Sign Convention Integration Schemes Shell Elements – pitfalls to avoid Beam Elements General Suggestions

ABAQUS CAE - Modules • • • PART SKETCH ASSEMBLY PROPERTY Create part using Sketcher sketcher Creation of instances and assembly. Define Material, SECTION Properties and ASSIGNS it. STEP Analysis Steps INTERACTION Interaction Properties, Constraints. Contact between 2 surfaces, LOAD Loads, Boundary Conditions and Fields. MESH Choice of element JOB Creates Job, associates job with a MODEL VISUALIZATION Post processing

Sign Convention • Displacements and point loads are positive in the direction of the positive axes. • Normal Stresses – Tensile stress is +ve. • Shear stress – anticlockwise about element centre is +ve. • Direct strains – Tensile stress is +ve • Soils consolidation s’ = s + u

Stress Discontinuities • Stresses are calculated accurately at Gauss (Integration) points. • Displacements are continuous across element boundaries. • Stresses jump across element boundaries.

Shell Element - Normal • The direction of the +ve normal is defined by the nodal sequence and the Right hand rule. • The section points are numbered in the direction of the +ve normal. The section points identify the sections.