Block shear fialure mode of axially loaded group of screws

Publikation: Konferenzbeitrag(Altdaten) Vortrag oder PräsentationForschung

Abstract

Self-tapping screws are efficient and flexible fasteners, applicable for many types of connections. Investigations on axially loaded groups of screws pointed out, that small spacing between the screws lead to block shear failure mode. So far, block and plug shear failure mode are only analysed for laterally loaded fasteners. Corresponding models cannot be simple transferred to primary axially loaded screws, because of their load insertion continuously along the effective thread featuring a thread-fibre angle perpendicular or with an angle to grain. Results gained by means of two different test configurations, with constant 90° thread-fibre angle but different configurations of group of screws and support conditions are presented. A block shear model is presented, and for mean values for stiffness and strength properties as model parameters are discussed together with values for parameters related to the force distribution over the effective thread length for the first test configuration. Agreement between model and test results was found on a conservative basis. As outlook, considerations of additional bending stresses as well as parameter optimisation are seen as prerequisites and next steps for further model improvement and practicality.
Originalspracheenglisch
PublikationsstatusVeröffentlicht - 23 Aug 2016
VeranstaltungWorld Conference on Timber Engineering - Universität Wien, Wien, Österreich
Dauer: 22 Aug 201625 Aug 2016
http://wcte2016.conf.tuwien.ac.at/home/

Konferenz

KonferenzWorld Conference on Timber Engineering
KurztitelWCTE 2016
LandÖsterreich
OrtWien
Zeitraum22/08/1625/08/16
Internetadresse

Fingerprint

Fasteners
Failure modes
Lead screws
Fibers
Stiffness

Schlagwörter

    Dies zitieren

    Mahlknecht, U., Brandner, R., & Augustin, M. (2016). Block shear fialure mode of axially loaded group of screws. World Conference on Timber Engineering, Wien, Österreich.

    Block shear fialure mode of axially loaded group of screws. / Mahlknecht, Ursula; Brandner, Reinhard; Augustin, Manfred.

    2016. World Conference on Timber Engineering, Wien, Österreich.

    Publikation: Konferenzbeitrag(Altdaten) Vortrag oder PräsentationForschung

    Mahlknecht, U, Brandner, R & Augustin, M 2016, 'Block shear fialure mode of axially loaded group of screws' World Conference on Timber Engineering, Wien, Österreich, 22/08/16 - 25/08/16, .
    Mahlknecht U, Brandner R, Augustin M. Block shear fialure mode of axially loaded group of screws. 2016. World Conference on Timber Engineering, Wien, Österreich.
    @conference{5159e0c0b3324a419e7c538fc827f40b,
    title = "Block shear fialure mode of axially loaded group of screws",
    abstract = "Self-tapping screws are efficient and flexible fasteners, applicable for many types of connections. Investigations on axially loaded groups of screws pointed out, that small spacing between the screws lead to block shear failure mode. So far, block and plug shear failure mode are only analysed for laterally loaded fasteners. Corresponding models cannot be simple transferred to primary axially loaded screws, because of their load insertion continuously along the effective thread featuring a thread-fibre angle perpendicular or with an angle to grain. Results gained by means of two different test configurations, with constant 90° thread-fibre angle but different configurations of group of screws and support conditions are presented. A block shear model is presented, and for mean values for stiffness and strength properties as model parameters are discussed together with values for parameters related to the force distribution over the effective thread length for the first test configuration. Agreement between model and test results was found on a conservative basis. As outlook, considerations of additional bending stresses as well as parameter optimisation are seen as prerequisites and next steps for further model improvement and practicality.",
    keywords = "block shear, screw group",
    author = "Ursula Mahlknecht and Reinhard Brandner and Manfred Augustin",
    year = "2016",
    month = "8",
    day = "23",
    language = "English",
    note = "World Conference on Timber Engineering, WCTE 2016 ; Conference date: 22-08-2016 Through 25-08-2016",
    url = "http://wcte2016.conf.tuwien.ac.at/home/",

    }

    TY - CONF

    T1 - Block shear fialure mode of axially loaded group of screws

    AU - Mahlknecht, Ursula

    AU - Brandner, Reinhard

    AU - Augustin, Manfred

    PY - 2016/8/23

    Y1 - 2016/8/23

    N2 - Self-tapping screws are efficient and flexible fasteners, applicable for many types of connections. Investigations on axially loaded groups of screws pointed out, that small spacing between the screws lead to block shear failure mode. So far, block and plug shear failure mode are only analysed for laterally loaded fasteners. Corresponding models cannot be simple transferred to primary axially loaded screws, because of their load insertion continuously along the effective thread featuring a thread-fibre angle perpendicular or with an angle to grain. Results gained by means of two different test configurations, with constant 90° thread-fibre angle but different configurations of group of screws and support conditions are presented. A block shear model is presented, and for mean values for stiffness and strength properties as model parameters are discussed together with values for parameters related to the force distribution over the effective thread length for the first test configuration. Agreement between model and test results was found on a conservative basis. As outlook, considerations of additional bending stresses as well as parameter optimisation are seen as prerequisites and next steps for further model improvement and practicality.

    AB - Self-tapping screws are efficient and flexible fasteners, applicable for many types of connections. Investigations on axially loaded groups of screws pointed out, that small spacing between the screws lead to block shear failure mode. So far, block and plug shear failure mode are only analysed for laterally loaded fasteners. Corresponding models cannot be simple transferred to primary axially loaded screws, because of their load insertion continuously along the effective thread featuring a thread-fibre angle perpendicular or with an angle to grain. Results gained by means of two different test configurations, with constant 90° thread-fibre angle but different configurations of group of screws and support conditions are presented. A block shear model is presented, and for mean values for stiffness and strength properties as model parameters are discussed together with values for parameters related to the force distribution over the effective thread length for the first test configuration. Agreement between model and test results was found on a conservative basis. As outlook, considerations of additional bending stresses as well as parameter optimisation are seen as prerequisites and next steps for further model improvement and practicality.

    KW - block shear

    KW - screw group

    M3 - (Old data) Lecture or Presentation

    ER -