workshop 4c: preparing for fea analysis

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Workshop 4C: Preparing for FEA Analysis

Introduction to ANSYS SpaceClaim Direct Modeler

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Overview

Completion of this workshop involves:

• Clean up of impressions and small holes

• Beam extraction

• Midsurface extraction

• Extend beams and midsurfaces to establish connection

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• Clean up model by removing small holes and impressions

• Simplify model by extracting beams and shell

• Connect extracted beams and shells

Objectives

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Open Spaceclaim File

“File Open” the file “Undersea_model.scdoc”

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Clean-Up Impressions on Model

Use “Design Fill” to remove impressions

• Select faces representing impressions on the model using box selection

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Clean-Up Small Holes in Model

Use “Design Fill” to remove small holes

• Select face of any one hole and click “Selection” tab

• Select “All equal radius cylinders” option to select all holes of same radius

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Clean-Up Small Holes in Model (continued)

• Click “Complete” to remove holes by filling material

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Extract Beam from Cylinders

Use “Prepare Extract” to extract beam from cylinder

• Select any one cylinder body to extract beam out of it

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Extract Beam from Cylinders (continued)

Similarly, Extract beam for all cylindrical bodies

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Extract Shell from Thin Bodies

Use “Prepare Midsurface” to extract shell (midsurface) from thin bodies

• Select “Use range” option and set Min and Max thickness as 10 mm and 50 mm respectively

– For any selected body, all face pairs within the specified thickness range gets selected automatically

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Extract Shell from Thin Bodies (continued)

• Click “Complete” to extract midsurfaces for selected body

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Extract Shell from Thin Bodies (continued)

• Similarly extract midsurfaces for all thin bodies

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Check Connectivity

Use “Prepare ShowContact” to view connections in model

• Set “Share Topology” option as “Share” to view connections

• Surface bodies and beams have gap which need to be removed to establish proper connections

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Extend Midsurfaces and Beams

Use “Prepare Extend” to extend edges and points

• Specify “Maximum Distance” as 20 mm

• Click “Complete” a couple of times to fix all the highlighted regions

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Extend Midsurfaces and Beams (continued)

There are several additional regions where gaps need to removed. “Extend” tool might change the topology in these regions so its recommended to manually work on these areas

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Extend Midsurfaces and Beams (continued)

Use “Design Move” to extend point

• Select end point of beam to move

• Select lower beam as “Up To” destination

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Extend Midsurfaces and Beams (continued)

Use “Design Move” to extend edge

• Select edge of midsurface to move

• Select adjacent beam as “Up To” destination

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Extend Midsurfaces and Beams (continued)

Similarly remove all gaps in model using “Move” tool