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The purpose of this test is to compare a bolt tightening connection property and a virtual bolt tightening connection property. You will use 3D models. |
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Reference: Comparison of the two models. |
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Bolt tightening connection property |
Virtual bolt tightening connection property |
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R1 = 35 mm |
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Hood:
R1 = 600 mm |
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Base:
R1 = 400 mm |
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Assembly:
For the bolt connection property model, the hood, the base and six screws are assembled. For the virtual bolt connection property, only the hood and the base are assembled.
Bolt tightening connection property |
Virtual bolt tightening connection property |
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Young Modulus (material):
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Poisson's Ratio (material):
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Mesh Specifications:
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Contact Connections:
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Restraints: The base is clamped on surface A |
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Loads: |
The stiffness of the virtual bolt's spring depends on the length of the spring element, not on the length of the bolt used in the bolt tightening connection property.
Stiffness is given by the formula:
So for each component:
The general shape is the same for the two models:
Values of maximum displacement are:
Bolt tightening connection |
Virtual bolt tightening connection |
Relative error |
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-0.613 % |
Maximum displacement υ1 = 0.00816 mm |
Maximum displacement υ2 = 0.00811 mm |
You can also use parabolic tetrahedron elements (TE10). The difference is then -4.545 %
To Perform the Test:
The bolt_with_screw.CATAnalysis document presents a complete analysis of this case.
The bolt_without_screw.CATAnalysis document presents a complete analysis of this case.
To compute the case, proceed as follow:
Open the CATAnalysis document.
Compute the case in the Generative Structural Analysis workbench.