Mechanical characteristics and design of bolted T-shape flange joints subjected to tensile loadings

Shunichiro Sawa, Mitsutoshi Ishimura, Yuya Omiya, Toshiyuki Sawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Bolted joints have been widely used in mechanical structures. However, a design of bolted joints has been carried out empirically. In designing a bolted joint, it is necessary to know a ratio of increment Ftin axial bolt force to an external tensile loading W, that is, the load factor ψ=Ft/W. In our previous paper, the new formulation for obtaining the value of the load factor ψ for a bolted joint in which two hollow cylinders were clamped was proposed by introducing the tensile spring constant Kψptfor clamped parts. Then, it is shown that the values of the load factor of bolted joint obtained from our formulation are in a fairly good agreement with the experimental values. In addition, the effect of the position where an external load is applied to the joint is significant on the value of the load factor. In the present paper, a method for obtaining the value of the load factor for bolted T-shape flange joints in which two T-shape flanges are clamped by two bolts and nuts under tensile loadings is demonstrated using two-dimensional theory of elasticity. In the analysis of the load factor ψ, the compressive spring constant Kc for a hollow cylinder around the bolt hole is calculated. The value of the correction factor Kc'/Kptis also analyzed using the two-dimensional theory of elasticity. When the external tensile loads are applied to the joints, the bolts are inclined and as the result, the bending moment occurs in the bolts. A method for analyzing the bending stress in the bolts is also demonstrated. In the numerical calculations, the distance C between the bolt position and the center of T-shape flange is varied and the effect of the distance C on the load factor is examined. For the validation of the analyses, calculations are also carried out. Experiments to measure the load factor and the maximum stress due to the bending moment occurred in the bolts were carried out. The numerical results of the load factor and the maximum stress in the bolts are fairly coincided with the experimental results. Furthermore, a design method for the joints is discussed, that is, how to determine the bolt position C, the bolt preload for the external tensile loading, how to choose the bolt strength.

Original languageEnglish
Title of host publicationAdvanced Manufacturing
PublisherAmerican Society of Mechanical Engineers (ASME)
Volume2B
ISBN (Print)9780791846445
DOIs
Publication statusPublished - 2014
EventASME 2014 International Mechanical Engineering Congress and Exposition, IMECE 2014 - Montreal, Canada
Duration: Nov 14 2014Nov 20 2014

Other

OtherASME 2014 International Mechanical Engineering Congress and Exposition, IMECE 2014
CountryCanada
CityMontreal
Period11/14/1411/20/14

Fingerprint

Bolts
Flanges
Bolted joints
Loads (forces)
Bending moments
Elasticity
Nuts (fasteners)

Keywords

  • 2-D beam model
  • Bolted joint
  • Contact stress distribution
  • External loading
  • Load factor
  • Stress analysis
  • T-shape flange
  • Theory of elasticity

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Sawa, S., Ishimura, M., Omiya, Y., & Sawa, T. (2014). Mechanical characteristics and design of bolted T-shape flange joints subjected to tensile loadings. In Advanced Manufacturing (Vol. 2B). [38086] American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE2014-38086

Mechanical characteristics and design of bolted T-shape flange joints subjected to tensile loadings. / Sawa, Shunichiro; Ishimura, Mitsutoshi; Omiya, Yuya; Sawa, Toshiyuki.

Advanced Manufacturing. Vol. 2B American Society of Mechanical Engineers (ASME), 2014. 38086.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sawa, S, Ishimura, M, Omiya, Y & Sawa, T 2014, Mechanical characteristics and design of bolted T-shape flange joints subjected to tensile loadings. in Advanced Manufacturing. vol. 2B, 38086, American Society of Mechanical Engineers (ASME), ASME 2014 International Mechanical Engineering Congress and Exposition, IMECE 2014, Montreal, Canada, 11/14/14. https://doi.org/10.1115/IMECE2014-38086
Sawa S, Ishimura M, Omiya Y, Sawa T. Mechanical characteristics and design of bolted T-shape flange joints subjected to tensile loadings. In Advanced Manufacturing. Vol. 2B. American Society of Mechanical Engineers (ASME). 2014. 38086 https://doi.org/10.1115/IMECE2014-38086
Sawa, Shunichiro ; Ishimura, Mitsutoshi ; Omiya, Yuya ; Sawa, Toshiyuki. / Mechanical characteristics and design of bolted T-shape flange joints subjected to tensile loadings. Advanced Manufacturing. Vol. 2B American Society of Mechanical Engineers (ASME), 2014.
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AB - Bolted joints have been widely used in mechanical structures. However, a design of bolted joints has been carried out empirically. In designing a bolted joint, it is necessary to know a ratio of increment Ftin axial bolt force to an external tensile loading W, that is, the load factor ψ=Ft/W. In our previous paper, the new formulation for obtaining the value of the load factor ψ for a bolted joint in which two hollow cylinders were clamped was proposed by introducing the tensile spring constant Kψptfor clamped parts. Then, it is shown that the values of the load factor of bolted joint obtained from our formulation are in a fairly good agreement with the experimental values. In addition, the effect of the position where an external load is applied to the joint is significant on the value of the load factor. In the present paper, a method for obtaining the value of the load factor for bolted T-shape flange joints in which two T-shape flanges are clamped by two bolts and nuts under tensile loadings is demonstrated using two-dimensional theory of elasticity. In the analysis of the load factor ψ, the compressive spring constant Kc for a hollow cylinder around the bolt hole is calculated. The value of the correction factor Kc'/Kptis also analyzed using the two-dimensional theory of elasticity. When the external tensile loads are applied to the joints, the bolts are inclined and as the result, the bending moment occurs in the bolts. A method for analyzing the bending stress in the bolts is also demonstrated. In the numerical calculations, the distance C between the bolt position and the center of T-shape flange is varied and the effect of the distance C on the load factor is examined. For the validation of the analyses, calculations are also carried out. Experiments to measure the load factor and the maximum stress due to the bending moment occurred in the bolts were carried out. The numerical results of the load factor and the maximum stress in the bolts are fairly coincided with the experimental results. Furthermore, a design method for the joints is discussed, that is, how to determine the bolt position C, the bolt preload for the external tensile loading, how to choose the bolt strength.

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