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Maschinenbau-Forum • Biegung durch Krafteinwirkung von innen
Seite 1 von 1

Biegung durch Krafteinwirkung von innen

BeitragVerfasst: Fr 22. Jan 2010, 11:56
von saman1357
Hi,
weiß jemand wie ich die Durchbiegung eines geschlossenen Trägers berechnen kann? Es handelt sich um ein geschlossenen Trog, das Problem ist aber dass die Last nicht von oben auf den Querschnitt wirkt sondern von innen (auf die Innenseite des Querschnitts). Eine Zeichnung ist beigefügt.

Vielen Dank im Vorraus
Saman1357

Durchbiegung.JPG
Durchbiegung.JPG (18.37 KiB) 1419-mal betrachtet

Re: Biegung durch Krafteinwirkung von innen

BeitragVerfasst: Mo 25. Jan 2010, 20:37
von rask
Hi,
also ich kann jetzt auch falsch liegen, aber man kann doch Kräfte bzw. Kraftvektoren entlang ihrer wirkungslinie verschieben. D.h., dass es eigentlich egals ist, ob die querkraft oben oder unten wirkt.
Diese Regel stammt jedenfalls aus der Statik, also vielleicht kann man sie in deinem Fall nicht anwenden :?

Re: Biegung durch Krafteinwirkung von innen

BeitragVerfasst: Fr 29. Jan 2010, 11:27
von Nimrod
Hi,
also ich kann jetzt auch falsch liegen, aber man kann doch Kräfte bzw. Kraftvektoren entlang ihrer wirkungslinie verschieben. D.h., dass es eigentlich egals ist, ob die querkraft oben oder unten wirkt.
Diese Regel stammt jedenfalls aus der Statik, also vielleicht kann man sie in deinem Fall nicht anwenden


Ja, du liegst falsch!
Die Verschiebung einer Kraft auf einer Wirklinie setzt einen starren Körper voraus.
Da er hier die Durchbiegung berechnen will ändert sich bei Kraftverschiebung :
1.)Die Biegesteifigkeit E*I, da sich das Flächenträgheitsmoment bei Kraftverschiebung ändern kann.
2.)Er hat keinen starren sondern einen elastisch verformbaren Körper.
----> Keine Verschiebung der Kraft

Lösung: Die Biegesteifigkeit (und hierfür das Flächenträgheitsmoment)des mit der Kraft(und daraus das resultierende Biegemoment)
belasteten Körpers muss berechnet werden

Re: Biegung durch Krafteinwirkung von innen

BeitragVerfasst: Fr 6. Feb 2015, 08:53
von Cock146
Eine Zeichnung ist beigefügt...??


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