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<DIV>No, presne tento pripad to je. Diky za prodrobny navod.</DIV>
<DIV>podstava je dlouha 800mm</DIV>
<DIV>vyska je 1700mm</DIV>
<DIV>horni rameno 400mm</DIV>
<DIV> </DIV>
<DIV>L = 0,4m , F =1000N</DIV>
<DIV>D = 0,0483m ; d =0,0443m</DIV>
<DIV> </DIV>
<DIV>=> </DIV>
<DIV>M = F*L = 400Nm</DIV>
<DIV>W0 = pi*(D^4-d^4)/(32*D) = 3.23e-6</DIV>
<DIV>St = pi*((D/2)^2 - (d/2)^2) = 2.91e-4</DIV>
<DIV> </DIV>
<DIV>p = M/Wo + F/St = 127,3Mpa</DIV>
<DIV> </DIV>
<DIV>To nevypada zrovna na bezproblemovy stav.</DIV>
<DIV> </DIV>
<DIV>Tosa</DIV>
<DIV> </DIV>
<DIV><BR>------ Původní zpráva ------<BR>Od: "Michal Lukac" <michal.lukac@fstroj.uniza.sk><BR>Komu: "HW-news" <hw-list@list.hw.cz><BR>Odesláno: 22.8.2012 9:24:28<BR>Předmět: Re: OT: ohyb trubky 50mm<BR></DIV>
<BLOCKQUOTE class=cite cite=1E524EF9780C4037B672F48FA92B54D2@cimml type="cite">
<DIV id=9ff57ce5250845468f42d59ab7c6eafa>
<DIV dir=ltr>
<DIV style="FONT-FAMILY: 'Arial'; COLOR: #000000; FONT-SIZE: 12pt">
<DIV style="LINE-HEIGHT: normal; BACKGROUND-COLOR: #f5f5f5; FONT-FAMILY: ">
<DIV style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none"><FONT face="Courier New">> a jak si overit, ze takova trubka ohnuta do U vydrzi zatizeni rekneme 100kg (= >neohne se). </FONT></DIV></DIV>
<DIV><FONT face="Courier New"></FONT> </DIV>
<DIV> </DIV>
<DIV><FONT face="Courier New">a ako je zatazene ta ohnuta trubka? Ako lezate U a stlaca sa?</FONT></DIV>
<DIV><FONT face="Courier New">tak potom takto: </FONT></DIV>
<DIV><FONT face="Courier New">moment v mieste ohybu: M=F*L F=1000N, L je vzdialenost sily od ohybu (najvzdial)</FONT></DIV>
<DIV><FONT face="Courier New"></FONT> </DIV>
<DIV><FONT face="Courier New">|F</FONT></DIV>
<DIV><FONT face="Courier New">|</FONT></DIV>
<DIV><FONT face="Courier New">\|/</FONT></DIV>
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<DIV style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none"><FONT face="Courier New">----------- |</FONT></DIV></DIV>
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<DIV style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none"><FONT face="Courier New">| |</FONT></DIV></DIV>
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<DIV style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none"><FONT face="Courier New">|<-----L --->|</FONT></DIV></DIV>
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<DIV style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none"><FONT face="Courier New"></FONT> </DIV></DIV>
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<DIV style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none"><FONT face="Courier New">Potom napatie v mieste ohybu p = (NapOdOhybu) + (NapOdTlaku) = M/Wo + F/St </FONT></DIV></DIV>
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<DIV style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none"><FONT face="Courier New">Wo je modul prierezu v ohybe = pi*(D^4-d^4)/(32*D) a St je plocha prierezu trubky (materialu), D a d su velky a maly priemer trubky.</FONT></DIV></DIV>
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<DIV style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none"><FONT face="Courier New">a to p by malo byt mensie ako dovolene pre dany mat. dajme tomu okolo 100MPa pre bezny mat.</FONT></DIV></DIV>
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<DIV style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none"><FONT face="Courier New">mozno by ale stalo zato spocitat ze ked sa to sice plasticky nedeformuje ci to nebude moc pruzne a ohne sa to len pruzne...</FONT></DIV></DIV>
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<DIV style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none"><FONT face="Courier New">m.</FONT></DIV></DIV></DIV></DIV></DIV></BLOCKQUOTE></BODY></HTML>