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# Calculating Bolted Joint Stiffness

## Calculating Bolted Joint Stiffness

(OP)
we are modelling some bolted joints using CBUSH elements in FEM. can anybody help what is the difference in using huth method and using AG/L to calculate shear stiffness. Thanks in Advance.

### RE: Calculating Bolted Joint Stiffness

um, huth's equation is not AG/L ... (that'd be the difference)

### RE: Calculating Bolted Joint Stiffness

Most of the joint flexibility is not fastener shear deformation. Have you read Huth's paper?

### RE: Calculating Bolted Joint Stiffness

(OP)
I have not read Huth's paper. But what I am doing wrong if i Use AG/L as CBUSH stiffness.

### RE: Calculating Bolted Joint Stiffness

Agreed. Way too stiff by only considering fastener shear deformation.

Best approach - fab a two row joint specimen, test it, measure displacement. Then correlate your FEM approach to the test.

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