Abstract
For tightening bolted joints, the calibrated wrench method is widely used in practice. However, this method is not so accurate since the measurement of axial tension is indirect. In the previous paper, the statistical distribution of magnitude of the axial tension in bolts, which were tightened by the calibrated wrench method, was formulatcd using the ellipse of confidence limit. This paper shows the distribution of probability density of the axial tension and screw characteristics from an experimental analysis. Measurements were performed on several examples to check the analysis and to confirm the effectiveness of the proposed technique, that is, the increase of initial axial tension.
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