Abstract
Angle control method is one of the basic tightening control methods for bolted joints. The accuracy of the clamp force induced depends basically on the combined stiffness of the bolt/nut assembly and the clamped member which can be determined from the material and the geometry of the bolted joint. However, the preliminary experiment is sometimes required to determine the target angle since the combined stiffness normally represents the non-linear behavior. This study aim to obtain the angle/clamp force relationship by using 2-D FEM. The results suggest that the combined stiffness or the relation between the rotational angle and the clamp force is affected by 3-dimensional factors such as the slippage at the mating threads.
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