abaqus – advanced use element and node sets shear locking in solid elements reduced integration...
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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
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ABAQUS CAE - Modules• PART Create part using Sketcher• SKETCH sketcher• ASSEMBLY Creation of instances and assembly.• PROPERTY 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
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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 ’u
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Stress Discontinuities
• Stresses are calculated accurately at Gauss (Integration) points.
• Displacements are continuous across element boundaries.
• Stresses jump across element boundaries.
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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.
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