Transcript ABAQUS-Advanced

ABAQUS – Advanced use
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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
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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.