CAD Meshing and Defeaturing Quiz

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Questions and Answers

What advantage does fillet defeaturing provide before exporting geometry?

It simplifies complex designs for easier manufacturing. (correct)

It improves the accuracy of CAD simulations.

It reduces export file size significantly.

It enhances the visual aesthetics of the model.

Which option is stated to be more effective for fillet defeaturing?

IGES files

Parasolid (correct)

Mesh options

STEP files

What should be done with small edges when merging CAD faces?

They should be ignored during meshing.

They enhance the CAD model detail.

They are automatically suppressed while meshing. (correct)

They must be manually suppressed.

What is the first step in the CAD-based workflow described?

Import Parasolid Signup and view all the answers

What tool is suggested to identify an adequate element size for meshing?

Measure tool Signup and view all the answers

What is the purpose of filling missing faces in a Parasolid body?

To guarantee a closed volume for simulations. Signup and view all the answers

Which type of mesh is mentioned specifically for a body Carrier in the meshing process?

Tri6 Mesh Signup and view all the answers

What follows after modifying the assembly in the CAD-based workflow?

Shell/Volume Mesh Signup and view all the answers

What is the primary function of the Connect|Shared option?

To isolate shared faces in a mesh assembly Signup and view all the answers

When would you use the one-click approach for meshing?

When confident the assembly operation will work Signup and view all the answers

What must be enabled to create shared faces during meshing for a Parasolid assembly?

Create matching mesh (Parasolid) Signup and view all the answers

What happens to shared faces if the Connect|Separate option is used?

They convert into congruent non-connected pairs Signup and view all the answers

What is the result of toggling CTRL+3 in the mesh body tool?

Isolates non-manifold edges Signup and view all the answers

What is recommended for small holes during mesh quality considerations?

They should be removed if they are not needed. Signup and view all the answers

After meshing a Parasolid assembly, what is the next step mentioned in the process?

Perform quality cleanup Signup and view all the answers

Which of the following states is true when using the connected assembly?

It is prepared for further processing like quality cleanup Signup and view all the answers

What is a common issue associated with removing fillets?

It can create fictive stress-hotspots along sharp edges. Signup and view all the answers

What should be done first before utilizing the one-click workflow for meshing?

Select the bodies for meshing Signup and view all the answers

Which selection method helps in finding cylinders in the modeling environment?

Circular selection filter with identical faces. Signup and view all the answers

What is the primary purpose of using RBE3 elements in 1D Bolt Modeling?

To transfer loads without increasing stiffness Signup and view all the answers

Why are chamfers generally easier to work with regarding mesh quality?

They typically introduce fewer problems with mesh quality. Signup and view all the answers

In 1D Bolt Modeling, how should the bolt shaft be represented?

With at least 2 bar elements Signup and view all the answers

What option should be used to preserve the shape of adjacent faces when dealing with small chamfers?

Retain them to maintain adjacent face integrity. Signup and view all the answers

Which of the following methods is NOT used for modeling 1D bolts?

Complex 3D Solid Bolt modeling Signup and view all the answers

When is it acceptable to defeature fillets in modeling tasks?

Only if explicitly required by the modeling task. Signup and view all the answers

What does utilizing the 'Select Features' option help achieve?

It helps in pinpointing specific modeling features efficiently. Signup and view all the answers

What key aspect is defined between the bar elements to simulate bolt tension in 1D modeling?

Pretension Load Signup and view all the answers

What is true about the removal of holes in terms of mesh quality?

Removing unnecessary holes improves mesh quality. Signup and view all the answers

In the context of 1D Bolt Modeling, what does RSpider represent?

The average of the bolt head and hole radii Signup and view all the answers

What differentiates the Automatic Bolt modeling from other methods?

It utilizes template-based imports Signup and view all the answers

When modeling a Quick 1D Bolt with pretension, what specific load configuration is involved?

Pretension Force is involved Signup and view all the answers

Which type of elements is recommended for transferring loads in the bolt head?

RBE3 elements Signup and view all the answers

Which of the following is a course offered under Altair SimLab?

Altair SimLab Automation (Python) Signup and view all the answers

What type of analysis is included in the Structural Analysis offerings of Altair SimLab?

Static and Dynamic Structural Linear Analysis Signup and view all the answers

Which SimLab solution is specifically focused on electronics?

Altair SimLab – Electronics Signup and view all the answers

What type of simulation is provided under the solutions offered by Altair SimLab related to impact scenarios?

Drop Test and Impact Test Simulation Signup and view all the answers

Which of these topics is NOT a part of the general solutions offered by Altair SimLab?

Geometric Dimensioning and Tolerancing Signup and view all the answers

What must be created before using Altair Solvers?

A solution setup Signup and view all the answers

Which of the following is true regarding LBCs when using a solution?

LBCs are added to the current solution Signup and view all the answers

What is the difference in handling entity sets with and without a solution?

Entity sets are only created automatically when a solution is defined Signup and view all the answers

What happens to LBCs in the absence of a solution?

They are added to the LBC Browser Signup and view all the answers

Which solvers require a solution to be created first?

OptiStruct and Radioss Signup and view all the answers

How are contacts set up if an entity based creation is used?

Set pairs are created for contacts Signup and view all the answers

What is the outcome of exporting mesh without a solution?

Mesh information is limited to the LBC Browser Signup and view all the answers

What is common between Ansys, Marc, and Nastran in the context of solver setup?

They can be set up directly without creating a solution Signup and view all the answers

Study Notes

Altair SimLab - Meshing and Modeling Course

The course provides training on meshing and modeling using Altair SimLab, version v2022.3.
The course agenda covers getting started, model management, CAD-based vs. mesh-based editing, stage 1 (CAD-based modeling), stage 2 (mesh-based modeling, Extra tools), stage 3 (assembly and connections)

Getting Started

The course will differentiate between CAD-based and mesh-based editing.

Model Management

Covers CAD-based assembly.
Covers mesh-based assembly.
Covers bolt modeling.
Covers contact modeling.

Stage 1: CAD Based Modeling

1.1 CAD Based Defeaturing
- Simplifying CAD geometry is an operation that is often not needed.
- Logos/part numbers are recommended to be removed during defeaturing.
- Small holes may be necessary to remove sometimes.
- Chamfers and fillets are typically not needed but sometimes are.
1.2 Fundamentals of Meshing
- Not detailed further

Stage 2: Mesh Based Modeling

2.1 Mesh Controls, Mesh Templates
- Details on mesh controls for managing mesh density, quality, and structure.
2.2 Mesh Editing and Cleanup
- Techniques for mesh editing and cleanup

Stage 3: Assembly and Connections

Procedures for assembling and connecting components.

Parasolid CAD Defeaturing

Simplifying CAD geometry is described an operation that is sometimes unnecessary.
Removing logos/part numbers is usually recommended.
Removing small holes is sometimes needed.
Removing chamfers and fillets is often not needed.

CAD-Based Workflow

Importing Parasolid files
Modifying the model
Creating a shell/volume mesh
Performing cleanup of connections
Solution setup
Generating results

1.1 CAD Based Defeaturing

Details on how to properly defeaturing CAD objects using Altair SimLab

Geometry Editing: CAD-Based vs Mesh-Based

CAD Based (Stage 1):
- Works better and quicker
- Can be combined with Mesh Editing
- CAD translation may cause problems.
Mesh Based (Stage 2):
- Allows native CAD formats, with no translation
- It may require cleanup to repair modified mesh.

Mesh-Based Workflow

Importing CAD data
Creating surface mesh
Creating volume mesh
Connections
Solution SetUp
Results
Cleanup

2.1 Mesh Controls, Mesh Templates

The density, quality, and structure of the mesh can be controlled using Mesh Controls, usually defined on entities in CAD, but sometimes on FE entities too, especially when remeshing.
Mesh controls only impact the specified body.

2.2 Mesh Editing and Cleanup

This stage covers techniques to refine and optimize the mesh.

Local Remeshing

Methods available to refine the mesh locally according to the specific requirements of a component.

3.2 Mesh Based Assembly

Procedures for assembling components using the mesh data.

Join Operations

How to join mesh-based entities.

3.3 Connectors and Bolts

Details about various types of connectors and creating them (including Rigid, Bar Element, Bush, Spring, Damper, MPCs, Joint, Gap Element, Plot Element, Matrix Element).

3.4 Contacts

With and without a solution.
- Solution: for OptiStruct, Radioss, ABAQUS, PERMAS
- Without Solution: for ADVC, Nastran, Ansys

Export Mesh / Write Solver Deck

Process of exporting the mesh data and preparing it for use by the solver.

Result Mapping

Tools to map results generated by a simulation as loads in a new or existing solution.

Refinement from Hot Spot

Techniques for improving mesh refinement for components experiencing high stress concentrations.

Result Tools for Powertrain

Tools for particular purposes, such as bore distortion and valve seat distortion analysis.

Solver Deck Creation

Details on how various solvers (including OptiStruct, Radioss, AcuSolve, nFX, Molding, Flux, ElectroFlo, ABAQUS, Permas, etc.) are incorporated in the software.

Entity Sets

Procedures for creating and using entity sets to simplify complex model handling for results visualization, contact definitions, etc.

Altair SimLab Courses

Offers general courses, structural analysis, NVH, acoustical optimization, drop test & impact test simulations, and courses on various types of physics problems (electronics, injection-molding, CFD, nFX).

Working with Results

Description of the processes used to analyze the results of a simulation.

Additional Information

Relevant websites, further study materials, and help resources are available for learning more.

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Description

Test your knowledge on CAD-based workflows, particularly focusing on fillet defeaturing and the meshing process for Parasolid assemblies. This quiz covers various aspects, from preparing geometry to identifying element sizes and managing mesh quality. Enhance your understanding of the techniques and tools used in CAD modeling.