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Cambridge University Engineering Department NotesPART IIA Week 4

Additional Notes in using ABAQUS - Mechanical CAD/CAM

1 Spool-Valve Analysis

Rounds and filleting is possible in ABAQUS CAE. Select the Part Module and thenSHAPE Blend Round/Fillet and then follow the instructions at the bottom of theviewport area.

If this does not work then do the filleting and adding rounds in ProE.

It is also possible to extrude and make cuts using SHAPE Extrude and SHAPE cut respectively.

2 Motor Cover Analysis

Import the cover part into ABAQUS.

Check that the diameter of the cover is 175. Use Tools

Query Distance. This will be in mms but ABAQUS does not have any units.It is the users responsibility to work using a consistent set of units. For example: (Length - mm, Force - N, Stress, pressure, Youngs modulus = MPa, density -Tonnes/mm3).

Create Material properties and create a solid section and assign the section to thecover.

In Assembly Module create an instance.

Step Module create a step : Static, General

In Mesh module assign a seed of 6 mm to the cover.

Loads Module : Fix either the base of the three tabs or the inner surface of thethree tabs in all three directions.

To apply the out-of-balance load of the shaft you need to partition the inside ofthe neck for a width of 10 mm.

First of all choose a direction for this out-of-balance load (3225 Newtons whichwill be applied as a pressure). This direction of the loading should be such that ittests the weakest section of the cover. Therefore it should not be in line with any

of the tabs. For the original cover it will be across the direction of the ventilationgrille.

Create datum planes which are 10 mm apart.

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For a redesigned cover choose a direction which is not in line with any of thetabs.

You need to create a datum axis (vertical through the center of the cover)( ).Then another vertical plane through that axis( ). Then create a plane at an angle

to the vertical plane.For this click and hold on the icon ( ) and then from themenu of icons select the icon( ) Then create two more planes either side of thisplane which is 10 mm apart (use offsets of +5 and -5 on the plane created).

In Figure 3 line aa indicates the axis and bb the plane through the axis (in thedirection of the vertical axis). Line cc represents the plane with the appropriaterotation for the direction of loading. dd and ee - the planes to make the partition.Partition only the surface and not the cell.

Allowing for fatigue failure you need to get the maximum stress level down toabout 16 MPa for the redesigned cover.

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Figure 1: Partition for the original Motor Cover

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Figure 2: Axis, plane through axis and the rotated plane

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Figure 3: Additional parallel planes

Peter Long

Arul M BrittoJune 6, 2011

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Figure 4: Surface to be partitioned

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Figure 5: First partition made. Select surface for second partition

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Figure 6: Partition Made

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Figure 7: Surface for application of pressure loading

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Figure 8: Pressure Load has been specified

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