Osaisiko joku laskea nämä lujuusopin tehtävät?
1. Thin wall tube has diameter of 60mm. The end of it will be compressed to square form. Calculate how many percents torsion strength will becomne lower at the end of tube?
2. A drill is made from steel S355JO, its ultimate strength510 Mba. They will make a deep hole in the earth . How long drill can be before it will break by own weight if the hole is full of wter?
3. Calculate maximum buckling force for a steel bar which is 150mm long and its diameter is 8mm. It is supported from both end by ball joints.
1. Thin wall tube has diameter of 60mm. The end of it will be compressed to square form. Calculate how many percents torsion strength will becomne lower at the end of tube?
2. A drill is made from steel S355JO, its ultimate strength510 Mba. They will make a deep hole in the earth . How long drill can be before it will break by own weight if the hole is full of wter?
3. Calculate maximum buckling force for a steel bar which is 150mm long and its diameter is 8mm. It is supported from both end by ball joints.
Vastaukset 4
Vanhimmat
Osaa, ja sinunkin kannattaisi opetella.
1.
http://www.roymech.co.uk/Useful_Tables/Torsion/Torsion.html
2.
http://www.springer.com/cda/content/document/cda_downloaddocument/9783642128851-c1.pdf
http://www.engineeringtoolbox.com/hydrostatic-pressure-water-d_1632.html
3.
http://civil.eng.buffalo.edu/cie325/asp/Elastic_Buckling_of_Bars.asp
Oikein näppärä opiskelija huomaa viitteen 1. virheen "Hollow Rectangle Thin Walled" osalta, joka pitäisi kuulua:
J' = (2·t·t₁·(a-t)²·(b-t₁)²)/(a·t b·t₁ - t² - t₁²)
Bumb