On the Deformation of the Bolt Head and Nut in a Bolted Joint

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概要

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• An important point in designing a bolted joint is to know the increment of an axial force produced in a bolt, when a load is applied on an assembly. For this purpose, it is necessary to know the spring constant K_c for a connected part and K_t for the bolt with a nut. In the calculation of K_t, up to now, the deformations of bolt head and nut have not been taken into consideration. A purpose of this paper is to analyze the value of K_t, taking into account these deformation, and to rationalize the design of the bolted joint. Assuming that the bolt head is a finite cylinder and the nut is a finite hollow cylinder, these deformations are analyzed by using the three-dimensional theory of elasticity. Experiments on these deformations are carried out, and the theoretical value is compared with the experimental one. They show a fairly good agreement with each other. Taking into account these deformations, for example, the value of K_t for M24 (clamping length 50 mm) is calculated. It is found that this value is 20% smaller than that of K_t by the conventional method.

• 一般社団法人日本機械学会の論文

著者

• Maruyama Kazuo

  The Research Laboratory Of Precision Machinery And Electronics The Tokyo Institute Of Technology

• SAWA Toshiyuki

  Graduate Student, Tokyo Institute of Technology

• Sawa Toshiyuki

  Graduate Student Tokyo Institute Of Technology

• MARUYAMA Kazuo

  The Research Laboratory of Precision Machinery and Electronics, The Tokyo Institute of Technology

• SAWA Toshiyuki

  Graduate School of Engineering, Hiroshima University

関連論文

• On Spring Constant of Connected Parts in Bolted Joints
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• Stress Analysis of a Bolt-Nut Joint by the Finite Element Method and the Copper-Electroplating Method : 1st Report, Stress at the Root of a V-Grooved Rod under a Tensile Load
• On the Deformation of the Bolt Head and Nut in a Bolted Joint
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