Abstract
The axial tension of the bolt in the plastic region tightening method depends on the yield point load of the threaded portion under the combined loads of the axial tension and the thread torque induced by the tightening. A new estimation method for the yield point load of the threaded portion is proposed taking account of the general yield criterion based on the rigid-plastic solution for combined loads. Considering the coefficient of friction at the flank of the thread and the residual thread torque after tightening, simple formulas are derived for the yield clamping force and the maximum additional axial tension under externally loading. It is confirmed from the experimental results obtained by a combined loading test that the proposed estimation method is superior to the conventional one taking into account only the local yield criterion. Upon applying the local or general yield criterion, the range of the initial clamping force is bounded between the elastic region tightening, the yield point tightening and the plastic region tightening.
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