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How is stiffness matrix for Pfast calculated in Patran or outside Patran?

How is stiffness matrix for Pfast calculated in Patran or outside Patran?

How is stiffness matrix for Pfast calculated in Patran or outside Patran?

So Pfast card requires stiffness matrix KTi and KRi to represent the stiffness of the joint with respect to fastener's and joining plates' topology. Patran gives user a freedom to fill out KTi and KRi. Patran also lets user select one of the Patran's in-house fastener stiffness formulas such as "Douglas", "Huth Hi-Lok in CFRP", "Huth solid rivet", etc; Kti will be automatically calculated if user selects the formula option (user still has to fill out KRi though).

I know each company has its own practice to model fasteners. Please comment below your experience with stiffness matrix for Pfast or any other approach (Pbush, Pbar,etc)

RE: How is stiffness matrix for Pfast calculated in Patran or outside Patran?

MSC just replied to me that the KT1, KT2 and KT3 formulas can be found in the "Patran Interface to MSC Nastran Preference Guide". I am still interested in knowing how KRi should be calculated. Thanks

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