Diagram of Prestress Bolted Connection Joint

where:
F | operation force |
Ψ | factor of joint tightness |
F o | prestress force |
F max | maximum operation force in the bolt |
ΔF 1 | increasing of prestress in the bolt due to the operation force |
ΔF 2 | reduction of clamping force in the joint due to the operating force |
Δl 1 | bolt elongation |
Δl 2 | compression of connected material |
c 1 | bolt spring constant |
c 2 | connected material spring constant |