Date
2021-08-17Metadata
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Aufsatz
Force distribution in self-tapping screws: experimental investigations with fibre Bragg grating measurement screws
Abstract
The pull-out resistance of fully threaded, self-tapping screws under axial loading has been investigated intensively in the past. Actual design models are based mainly on empirical data because the detailed interaction between the screw thread and the surrounding timber member remains unclear and might depend on the test set-up. An innovative screw sensor with 19 internal fibre Bragg gratings (FBGs) was developed to measure the forces along the screw axis. The screw diameter was 12 mm and the maximum embedding length was 360 mm. The FBG measurement screw was applied in pull-out tests under different support conditions. The results carried out show details of the axial forces along fully threaded screws depending on the magnitude of the screw axis to grain angle, the embedding length, the material and the support conditions. Load transfer between the screw and the surrounding timber was determined by means of the change of axial forces along the screw axis. A comparison of the experimental results with Volkersen’s theory points out the decisive dependency of the support conditions on the axial forces in fully threaded self-tapping screws. Additionally, the experimental test results show indications of shear and compressive stresses in the interface of the measurement screw.
Citation
In: European Journal of Wood and Wood Products Volume 80 / Issue 1 (2021-08-17) , S. 183-197 ; eissn:1436-736XSponsorship
Gefördert im Rahmen des Projekts DEALCitation
@article{doi:10.17170/kobra-202202185764,
author={Claus, Timo and Seim, Werner and Küllmer, Johannes},
title={Force distribution in self-tapping screws: experimental investigations with fibre Bragg grating measurement screws},
journal={European Journal of Wood and Wood Products},
year={2021}
}
0500 Oax 0501 Text $btxt$2rdacontent 0502 Computermedien $bc$2rdacarrier 1100 2021$n2021 1500 1/eng 2050 ##0##http://hdl.handle.net/123456789/13655 3000 Claus, Timo 3010 Seim, Werner 3010 Küllmer, Johannes 4000 Force distribution in self-tapping screws: experimental investigations with fibre Bragg grating measurement screws / Claus, Timo 4030 4060 Online-Ressource 4085 ##0##=u http://nbn-resolving.de/http://hdl.handle.net/123456789/13655=x R 4204 \$dAufsatz 4170 5550 {{Bragg-Reflektor}} 5550 {{Schraube}} 5550 {{Axialbelastung}} 7136 ##0##http://hdl.handle.net/123456789/13655
2022-02-25T16:16:06Z 2022-02-25T16:16:06Z 2021-08-17 doi:10.17170/kobra-202202185764 http://hdl.handle.net/123456789/13655 Gefördert im Rahmen des Projekts DEAL eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ 600 Force distribution in self-tapping screws: experimental investigations with fibre Bragg grating measurement screws Aufsatz The pull-out resistance of fully threaded, self-tapping screws under axial loading has been investigated intensively in the past. Actual design models are based mainly on empirical data because the detailed interaction between the screw thread and the surrounding timber member remains unclear and might depend on the test set-up. An innovative screw sensor with 19 internal fibre Bragg gratings (FBGs) was developed to measure the forces along the screw axis. The screw diameter was 12 mm and the maximum embedding length was 360 mm. The FBG measurement screw was applied in pull-out tests under different support conditions. The results carried out show details of the axial forces along fully threaded screws depending on the magnitude of the screw axis to grain angle, the embedding length, the material and the support conditions. Load transfer between the screw and the surrounding timber was determined by means of the change of axial forces along the screw axis. A comparison of the experimental results with Volkersen’s theory points out the decisive dependency of the support conditions on the axial forces in fully threaded self-tapping screws. Additionally, the experimental test results show indications of shear and compressive stresses in the interface of the measurement screw. open access Claus, Timo Seim, Werner Küllmer, Johannes doi:10.1007/s00107-021-01740-z Bragg-Reflektor Schraube Axialbelastung publishedVersion eissn:1436-736X Issue 1 European Journal of Wood and Wood Products 183-197 Volume 80 false
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