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Very fundamantal question

 
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kajal.chopra
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Joined: 26 Jan 2003
Posts: 102

PostPosted: Thu May 22, 2014 6:36 am    Post subject: Very fundamantal question Reply with quote

Hello,

Please see attached image

This problem is a pair of opposing shallow notches in a bar subject to tension. A linear elastic, plane strain idealisation is used
.

Using symmetry about a horizontal line gives the problem geometry shown in the attached figure.


The vertical line of symmetry is deliberately ignored - using it would force a corner node to be at the peak stress position which would be unrepresentative of most of the component features of interest.


However, if I analyse with the boundary conditions as shown in the attached figure (normal deflection along the 38.1 mm arrested- this is a symmetric bc) and distributed load of 100 MPa along the 9.525 mm edge, the analysis fails showing a singular matrix.


Can anyone please help



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vsmkumar
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Joined: 03 May 2012
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PostPosted: Thu May 22, 2014 2:44 pm    Post subject: Reply with quote

if you arrest  normal deflection along the 38.1 mm then it becomes a support.

you have to apply symmetric boundary condition option available in the software.

you are appealing plane strain condition means you are are assigning 0.0 to poissons ratio.
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