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Analytical and experimental studies on the sequential flaring-buckling behavior of combined bi-tubes in blind bolts.

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Title: Analytical and experimental studies on the sequential flaring-buckling behavior of combined bi-tubes in blind bolts.
Authors: Feng, Jiaming1 (AUTHOR), Sun, Yuyin1 (AUTHOR), Jin, Wanjun2 (AUTHOR), Liao, Ridong1 (AUTHOR) liaord@bit.edu.cn
Source: International Journal of Solids & Structures. Feb2025, Vol. 308, pN.PAG-N.PAG. 1p.
Subjects: Airframes, Energy transfer, Deformations (Mechanics), Friction, Automobiles
Abstract: • The sequential flaring-buckling behavior of combined bi-tubes under axial compression on expanding dies was studied. The established analytical theory can predict the flaring forming force and critical buckling force with minor deviations. It can also estimate a variety of axisymmetric buckling deformation modes, such as double bulbs. This theory helps optimize combined bi-tubes to achieve the optimal joint shape. Combined bi-tubes are innovatively applied in modern composite blind bolts to provide the clamping force. In this study, the sequential flaring-buckling behavior of combined bi-tubes under axial compression on expanding dies was experimentally and analytically investigated. First, axial compression tests were performed on bi-tubes in three different dimension groups. Based on the test results, deformation modes and force–displacement curves were obtained to assess the specific energy absorption (SEA), clamping energy (E CL), and energy transfer ratio (ETR). The results show that bi-tubes have superior energy-absorbing capacity and clamping efficiency. SEA can reach 21 kJ/kg, and the E CL accounts for 50 ± 6 % of the total energy dissipated. Afterwards, a theoretical solution for flaring-buckling bi-tubes, which involves the flaring forming force, friction, and critical buckling force, was derived on the basis of an equal-thickness circular tube. A comparison of forces and deformation modes from analytical and experimental approaches leads to the observations that the analytical theory can assess the sequential flaring-buckling bi-tubes within acceptable proximity, the maximum deviations of flaring forming forces and critical buckling forces being 3.3 % and 6.6 %, and that it can effectively predict diverse deformation modes, i.e., a single bell-shaped bulb on the clamped structure, an upper bulb close to the platen, or double bulbs. This study is expected to provide guidance for the optimal design of the clamping structure on aircraft and automobiles. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Solids & Structures is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 181443069
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Analytical and experimental studies on the sequential flaring-buckling behavior of combined bi-tubes in blind bolts.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Feng%2C+Jiaming%22">Feng, Jiaming</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sun%2C+Yuyin%22">Sun, Yuyin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jin%2C+Wanjun%22">Jin, Wanjun</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liao%2C+Ridong%22">Liao, Ridong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> liaord@bit.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Solids+%26+Structures%22">International Journal of Solids & Structures</searchLink>. Feb2025, Vol. 308, pN.PAG-N.PAG. 1p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Airframes%22">Airframes</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+transfer%22">Energy transfer</searchLink><br /><searchLink fieldCode="DE" term="%22Deformations+%28Mechanics%29%22">Deformations (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Friction%22">Friction</searchLink><br /><searchLink fieldCode="DE" term="%22Automobiles%22">Automobiles</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • The sequential flaring-buckling behavior of combined bi-tubes under axial compression on expanding dies was studied. The established analytical theory can predict the flaring forming force and critical buckling force with minor deviations. It can also estimate a variety of axisymmetric buckling deformation modes, such as double bulbs. This theory helps optimize combined bi-tubes to achieve the optimal joint shape. Combined bi-tubes are innovatively applied in modern composite blind bolts to provide the clamping force. In this study, the sequential flaring-buckling behavior of combined bi-tubes under axial compression on expanding dies was experimentally and analytically investigated. First, axial compression tests were performed on bi-tubes in three different dimension groups. Based on the test results, deformation modes and force–displacement curves were obtained to assess the specific energy absorption (SEA), clamping energy (E CL), and energy transfer ratio (ETR). The results show that bi-tubes have superior energy-absorbing capacity and clamping efficiency. SEA can reach 21 kJ/kg, and the E CL accounts for 50 ± 6 % of the total energy dissipated. Afterwards, a theoretical solution for flaring-buckling bi-tubes, which involves the flaring forming force, friction, and critical buckling force, was derived on the basis of an equal-thickness circular tube. A comparison of forces and deformation modes from analytical and experimental approaches leads to the observations that the analytical theory can assess the sequential flaring-buckling bi-tubes within acceptable proximity, the maximum deviations of flaring forming forces and critical buckling forces being 3.3 % and 6.6 %, and that it can effectively predict diverse deformation modes, i.e., a single bell-shaped bulb on the clamped structure, an upper bulb close to the platen, or double bulbs. This study is expected to provide guidance for the optimal design of the clamping structure on aircraft and automobiles. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Solids & Structures is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.ijsolstr.2024.113158
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Airframes
        Type: general
      – SubjectFull: Energy transfer
        Type: general
      – SubjectFull: Deformations (Mechanics)
        Type: general
      – SubjectFull: Friction
        Type: general
      – SubjectFull: Automobiles
        Type: general
    Titles:
      – TitleFull: Analytical and experimental studies on the sequential flaring-buckling behavior of combined bi-tubes in blind bolts.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Feng, Jiaming
      – PersonEntity:
          Name:
            NameFull: Sun, Yuyin
      – PersonEntity:
          Name:
            NameFull: Jin, Wanjun
      – PersonEntity:
          Name:
            NameFull: Liao, Ridong
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          Dates:
            – D: 01
              M: 02
              Text: Feb2025
              Type: published
              Y: 2025
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            – Type: issn-print
              Value: 00207683
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            – Type: volume
              Value: 308
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            – TitleFull: International Journal of Solids & Structures
              Type: main
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