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한응교(Eung Kyo Han),김재열(Jae Yeol Kim) 한국자동차공학회 1988 오토저널 Vol.10 No.3
It is important to control the axial forces of high tension bolts such as the automobile,<br/> construction machine, aircraft, marine engine bolts.<br/> However, the direct method to measure the axial forces of bolts pratically have not been found out.<br/> The ultrasonic techniques is based on the principles that the bolt tensile elongation and ultrasonic velocity changes are proportional to the axial force below the yield point of the materials.<br/> From the result of the experiment,the coefficient of acoustoelasticity R could be measured as-11.18 x10^-5 mm²/Kgf.