Bolt clamping force versus torque relation (F-T relation) during tightening and untightening the nut having slight pitch difference

• Autores: Xi Liu, Yasushi Takase, Kosuke Tateishi, Yuto Inui, Nao-Aki Noda, Biao Wang, Yoshikazu Sano
• Localización: Mechanics based design of structures and machines, ISSN 1539-7734, Vol. 51, Nº. 7, 2023, págs. 3632-3649
• Idioma: inglés
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• Resumen

  • In this study, tightening and untightening experiments were conducted for pitch difference nuts toward realizing good anti-loosening performance. By applying the three-dimensional FEM, the relationship between the tightening force F and the tightening torque T was clarified by varying the pitch difference α during the whole nut tightening/untightening process. The well-known F-T formula available for tightening the normal nut (α = 0) agrees with the FEM results and the F-T formula for untightening the normal nut (α = 0) was newly proposed. Then, the loosening resistance ability of the pitch difference nut was clarified focusing on the untightening in comparison with the normal nut.