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05-07-2004
11:35 PM

05-07-2004
11:35 PM

Max Shear Stress Graph or Beam Reaction Force?

Can any of you Mech Structure Gurus give me please, an explanation of the result window 'Stress / Total / Maximum Shear Stress' that appeared in the 2001 version of Mechanica Structure?

I am trying to make sense of a model that was built built and run to figure out whether its hold down bolts were sufficient for certain G loads.

The model was a simplified shell model of a 'box' that is to be bolted into a 'vehicle'. Spot welds were used to represent the hold down bolts.

When Beam Reaction Forces for the spot welds ( beams) were graphed, and the graphs were used to calculate stresses, they gave results which compare favourably with simple calculated ones.

However........

If graphs of Stress / Total / Maximum Shear Stress/ Beams, using the beam elements (spot welds) were plotted, the graphs showed shear stress values that exceeded calculated shear stess values by a factor of 10 at least.

Here lies the problem. Should I take the shear stresses from the graphs of Stress/ Total / Maximum Shear Stress / Beams or should I use the Beam Resultant Forces and calculate the shear stresses from them?

I searched the PTC web site for info but couldn't find anyrhing.

Thanks Folks

Phil Austin, Mechanical Design Engineer, Mektron Systems Ltd in Bedford in the UK

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