| 摘要 |
After it is tightened with a snug torque T<SUB>A</SUB>, a bolt is tuned by a total turning angle theta<SUB>S </SUB>equivalent to the sum of an initial-set turning angle theta<SUB>A </SUB>and a corrective additional-turning angle (theta<SUB>B</SUB>+theta<SUB>C</SUB>). The corrective additional-turning angle (theta<SUB>B</SUB>+theta<SUB>C</SUB>) is the sum of a first corrective additional-turning angle theta<SUB>B </SUB>and a second corrective additional-turning angle theta<SUB>C</SUB>, the first corrective additional-turning angle theta<SUB>B </SUB>being to compensate for a situation where a bolt turning angle theta22 corresponding to the snug torque theta<SUB>A </SUB>on an extension line of the bolt tightening torque properties C2 in a late tightening stage II is different from a bolt turning angle theta11 corresponding to the actual snug torque T<SUB>A</SUB>, the second corrective additional-turning angle theta<SUB>C </SUB>being to compensate for a decrease of an effective bolt axial force that is caused by an existence of the initial tightening stage I.
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