Fig.1 in the attached files shows a typical case of the joint stiffness constant case. In this case, the external loads are applied to the plate, normally named as member. Normally the bolt load is like below.
Fb = C•P + Fi (when (1-C)P < Fi)
Where, Fb : bolt load, C : joint stiffness constant, P : external load, Fi : initial load driven by pretorque.
We are developing a kind of manifold and pressure measurement device on it. In this case, the external load is the pressure load applied to the device directly, not a member.
Fig.2 is an example captured from the internet to explain it. You can see the manifold, pretorque, pressure and the thread. In this case, what is the bolt load? How to calculate the joint stiffness constant? Is the external load distributed through the manifold?
I am not sure it can be still considered as a parallel spring model since the external load is applied to the device directly. So just in my opinion, the bolt load is, Fb = P + Fi when P < Fi, Fb = P when P > Fi. But I am not sure.
Could you please answer my question?
Thanks a lot.
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