Thread: Trekproef: E-modulus berekenen
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29-01-2014, 11:49 #1
Trekproef: E-modulus berekenen
ik heb een vraag ivm het berekenen van de E-modulus want ik het het klopt niet bij een waarde die ik een tabel vind.
Geg
materiaal Al
diameter= 11.95 mm
Ltot=200 mm
L0=120 mm
diagram =
nu het probleem is dat we ongeveer een factor 10 er naast zitten dus het kan zijn dat ik bepaalde waarden niet exact neem die jullie nemen
A0=(Pi*(11.92)^2)/4 = 112.16mm²
sigma= 29000/112.16 = 258.56 N/mm²
lengteverandering= 4 mm
epsilon = 4/120 =0.0333
sigma = E*epsilon
E=sigma/epsilon ->258.56/0.033 =7756.8 N/mm²
nu als ik in het boekje tabellenboek voor metaaltechniek de E opzoek Al staat daar tussen 60000-75000 N/mm² nu kan iemand zien waar mijn fout is.Last edited by thecoon; 29-01-2014 at 16:19.
“Everyone is in favor of free speech. Hardly a day passes without its being extolled, but some people's idea of it is that they are free to say what they like, but if anyone else says anything back, that is an outrage.”
Winston S. Churchillno votes
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29-01-2014, 12:41 #2Banned
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29-01-2014, 12:44 #3
ge die berekening is beter uitleggen ik snap het niet zo goed. gegevens hebben we gekregen dus ik heb niks berekend;
op uw PM Ltot= totale lengt van de staaf Lo is de lengte van de versmalling
alvast bedankt“Everyone is in favor of free speech. Hardly a day passes without its being extolled, but some people's idea of it is that they are free to say what they like, but if anyone else says anything back, that is an outrage.”
Winston S. Churchillno votes
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29-01-2014, 12:50 #4Banned
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ja, ik weet niet
epsilon is toch de relatieve uitrekking Delta L / L0
dus eindlengte - beginlengte over de beginlengte
(200-120) / 120
Denk ik eh, misschien staan uw Ltot en uw L0 voor iets geheel anders, tis lang geleden en ik ben geen expert ofzo.
Maar das wel uw factor 10 eh, van 0.4 naar 0.0333
Dus miss meetfout?no votes
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29-01-2014, 13:02 #5“Everyone is in favor of free speech. Hardly a day passes without its being extolled, but some people's idea of it is that they are free to say what they like, but if anyone else says anything back, that is an outrage.”
Winston S. Churchillno votes
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29-01-2014, 13:14 #6Approved 9-lifer
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29-01-2014, 13:19 #7“Everyone is in favor of free speech. Hardly a day passes without its being extolled, but some people's idea of it is that they are free to say what they like, but if anyone else says anything back, that is an outrage.”
Winston S. Churchillno votes
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29-01-2014, 13:49 #8Banned
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Ja
Is uw rek echt niet 4cm?The Young's modulus represents the factor of proportionality in Hooke's law, relating the stress and the strain ; but this law is only valid under the assumption of an elastic or linear response. Any real material will eventually fail and break when stretched over a very large distance or with a very large force ; however, all materials exhibit Hookean behavior for small enough strains or stresses. If the range over which Hooke's law is valid is large enough compared to the typical stress that one expects to apply to the material, the material is said to be linear ; if the typical stress one would apply is outside the linear range, then the material is said to be non-linear.
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29-01-2014, 14:58 #9
Last edited by thecoon; 29-01-2014 at 16:20.
“Everyone is in favor of free speech. Hardly a day passes without its being extolled, but some people's idea of it is that they are free to say what they like, but if anyone else says anything back, that is an outrage.”
Winston S. Churchillno votes
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02-02-2014, 19:12 #10Member
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Heeft de TS de oplossing al gevonden ?
De beginlengte en totale lengte lijken mij eerder onrealistisch...no votes
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02-02-2014, 19:20 #11“Everyone is in favor of free speech. Hardly a day passes without its being extolled, but some people's idea of it is that they are free to say what they like, but if anyone else says anything back, that is an outrage.”
Winston S. Churchillno votes

