what is the simple formula used in Hypermesh for fastener axial stiffness calculations ?

SSKG · 2025-02-11T12:37:20+00:00

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Hi Team,

I am looking for a simple formula used by Hypermesh for calculating axial stiffness while creating fasteners under fastener setup option.

I am getting a very negligible difference in tensile stiffness values when I compare the Hypermesh K1 value with analytical one.

Thank you

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Hi Jason,

Sorry, I missed to mention it before.

I am looking for CFAST. I can see the explanations for length consideration in the HM help but nothing menstioned for CFAST.

In addition, for shear stiffness calculation, is it possible to adopt the user Huth formula for CFAST shear stiffness calculation?

I am trying to create the CFAST using the option: Aerospace>Fatsener Set Up> CFAST with Element option for GA-GB reference.

Thank you

Shiva

Hello,

Can you please specify exactly which Fastener realization type you are using?

Thanks

jason

Hi Jason,

Sorry, I missed to mention it before.

I am looking for CFAST. I can see the explanations for length consideration in the HM help but nothing menstioned for CFAST.

In addition, for shear stiffness calculation, is it possible to adopt the user Huth formula for CFAST shear stiffness calculation?

I am trying to create the CFAST using the option: Aerospace>Fatsener Set Up> CFAST with Element option for GA-GB reference.

Thank you

Shiva

Hello

Yes it is using the Huth formulation.

You should be able to calculate your own values and input them manually.