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Stiffness Calculation Model of Thread Connection

Stiffness Calculation Model of Thread Connection

Stiffness Calculation Model of Thread Connection

I am trying to understand in interpret the following article:

Stiffness Calculation Model of Thread ConnectionConsidering Friction Factors

This will calculate a stiffness of a threaded connection and can calculate the force per thread.

I have tried to verify the document my making the calculations myself, so in the future I can use it for design of my own threaded connections.
So basically I am trying to replicate the numbers in Figure 21 and 22 by filling in the calculations.
I am using Smath for this, file attached.

Whatever I am trying I cannot get the numbers to match and it is driving me nuts.
Im doing something wrong, but I do not know what.
Is there someone here that please can assist?

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