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• ATOM – Abaqus Topology Optimisation Module • Introduction and demonstration • Latest Enhancements in Abaqus/CAE • A summary of enhancements and demonstration
• What is ATOM? • ATOM stands for Abaqus Topology Optimization Module • It allows for convenient setup and postprocessing of two classes of Structural optimization problems 1. Topology optimization
Topology Optimization • Given an initial material distribution (left), topology optimization produces a new landscape (right) by scaling the relative densities of the elements in the design domain.
• Elements with large relative densities are retained whilst those elements whose relative densities have become sufficiently small are assumed to be voids. Thus a new “landscape” is obtained.
Shape Optimization • Shape optimization refers to procedures that result in the prediction of a boundary (or shape) of the design domain of the structural/mechanical system to be optimized.
• In a finite element analysis, nodes on the boundary are displaced in order to achieve an objective (minimise the stress on the surface for example). • Thus, a new shape is obtained.
• Both Topology and Shape Optimisation support: • Contact • Geometric non-linearity • Nonlinear Materials:
• Within the design area: *plastic, *hypoelastic, most *hyperelastic • Outside design area: all • Manufacturing restrictions • Export smoothed shape to STL or INP
• The flow chart on the left shows the user actions required to setup the optimization • Each user action is associated with a manager in the Optimization module accessible from the Optimization Module Toolbox or the Model Tree
• Design Responses provide variables for the optimization solver • For example: Strain Energy, Displacement etc.
• Objective Functions define how those Design Responses should be used (sum/min/max/formula/etc) • Minimise Strain Energy (maximise stiffness) • Constraints determine bounds for the optimization solver
• For example: Constraint the volume to be less than 35% of the original volume • Geometric Restrictions provide for manufacturing restrictions • For example: de-molding direction with draft angle
ATOM Workflow: Execution and Monitoring • Once an Optimization Task is setup, an Optimization Process needs to be defined to execute the optimization • Users may have multiple Abaqus models and optimization tasks defined. An optimization process refers to a unique Model and Task combination. • Right-click on the optimization process to access: Validate, Submit, Restart, Monitor, Extract and Results postprocessing
• The Abaqus Visualization module allows for convenient visualization of optimization results • Postprocessing will be shown in more detail during the demonstration
• Manually create mid-surface representation of thin solids using geometry edit tools: • Face offset • Face extend/blend • Auto-trim • Benefits beyond mid-surfacing • Mechanism for capturing thickness of parent solid geometry and association with shell mesh. • Thickness query and display tools
Auto-selection of Target Faces • Selection of target faces can be time-consuming • Option to automatically select target faces based on proximity • Manual modification of selection • Available only if faces being offset belong to reference representation Target faces auto-selected
Option to Extend Target Faces Before Trimming • Using target faces to limit extension is a useful way to fill gaps between neighboring shell faces • Target faces may sometimes need to be extended (internally) for the purposes of trimming the selected faces • Allows user to decide whether to extend target faces • OFF by default. Turn ON only when needed gap Target face
Thickness Attributes on Faces Created by Blend/Cover • Faces created by Blend or Cover will have thickness automatically assigned to them if the neighboring faces have thickness attributes
Thickness data on the Offset Faces
2 Offset Faces
GUI to verify assigned thickness
New blend face with thickness inherited from neighbors SIMULIA Tutorial
• Merge/subdivide elements • Grow/collapse short element edges • Bottom-up meshing • Now available for orphan meshes • Generate elements by offsetting • Additional options for extrude method
• New field output identifier “BEAM_STRESS” • Mises = Von Mises stress • S11 = Axial stress • S12 = Shear stress along local beam section 2-axis • S13 = Shear stress along the local beam section 1-axis • Stress distributions derived using section/moment values from linear elastic beam theory • SF (section force) and SM (section moment) required
