S1108-4-5 ISO 16047に準拠した新しいねじ締付け試験機の開発 : 測定精度向上を目的とした試験機構造の最適化([S1108-4]卒業研究コンテスト(4))

抄録

It is one of the important issues for structural safety to control the clamp force of bolted joints. However, there is no tightening testing apparatus commercially available to evaluate the tightening characteristics for wide variety of fasteners in accordance with ISO 16047. This study aims to develop a new testing machine for torque/clamp testing, which will meet the requirements specified in ISO16047. In this study, the root cause of measuring error is analyzed both experimentally and analytically. Finally, it is found that the torque acting on the preloading bolts may affect the sensitivity of piezoelectric force sensors as well as the inherent characteristics of sensors, and the method to boost the accuracy is proposed.