Within the last 25 years, self-tapping screws have become the most
\nrelevant fasteners in contemporary timber engineering. Restricting the
\nscope to their axial loading, the present thesis aims on gaining a
\nfundamental knowledge concerning the specifics of this kind of
\ndowel-type fastener. The related considerations are divided into the two
\n main topics, namely the (steel) product \u201cself-tapping screw\u201d itself and
\n the withdrawal behaviour, defined as the axial composite interaction
\nwith the timber material where it is inserted into.
With regard to
\nthe product performance, the main outcomes are the derivation and
\nverification of a mechanical approach, describing the relationships of
\nits relevant design properties in dependence of a geometrically varying
\nthread profile, as well as some fundamental findings in terms of
\nfatigue-relevant loading and hydrogen-induced stress corrosion cracking
\n(HISCC).
In case of the withdrawal behaviour, based on about 14,000
\nexperimental results, the impact of several influencing parameters is
\ndetermined, discussed and described by means of empirical, stochastic
\nand mechanical modelling. Parameters, where a significant influence was
\nfound, are finally included in the determination of a universal approach
\n for the prediction of the screw\u2019s mean and characteristic withdrawal
\nstrength, irrespective the timber product used and the position the
\nscrew is inserted into.
<\/p>","protected":false},"excerpt":{"rendered":"
Within the last 25 years, self-tapping screws have become the most
\nrelevant fasteners in contemporary timber engineering. Restricting the
\nscope to their axial loading, the present thesis aims on gaining a
\nfundamental knowledge concerning the specifics of this kind of
\ndowel-type fastener. The related considerations are divided into the two
\n main topics, namely the (steel) product \u201cself-tapping screw\u201d itself and
\n the withdrawal behaviour, defined as the axial composite interaction
\nwith the timber material where it is inserted into.
With regard to
\nthe product performance, the main outcomes are the derivation and
\nverification of a mechanical approach, describing the relationships of
\nits relevant design properties in dependence of a geometrically varying
\nthread profile, as well as some fundamental findings in terms of
\nfatigue-relevant loading and hydrogen-induced stress corrosion cracking
\n(HISCC).
In case of the withdrawal behaviour, based on about 14,000
\nexperimental results, the impact of several influencing parameters is
\ndetermined, discussed and described by means of empirical, stochastic
\nand mechanical modelling. Parameters, where a significant influence was
\nfound, are finally included in the determination of a universal approach
\n for the prediction of the screw\u2019s mean and characteristic withdrawal
\nstrength, irrespective the timber product used and the position the
\nscrew is inserted into.<\/p>\n","protected":false},"featured_media":40130,"comment_status":"open","ping_status":"closed","template":"","meta":[],"yoast_head":"\n\n\n\n\n\n\n\n\n\n\t\n\t\n\n\n\t\n