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Unformatted text preview: MCEG 3013 Quiz 11 bb March 15, 2016 Fran f'
Personal Notes and Class Handouts ONLY
1. The two pressure tanks shown are both constructed from 6061T6 A1 with a maximum tensile strength of 60 ksi, 1/2 thick. The only difference between them is that one is welded on a helix, the other on a 90 degree
axis. Both contain pressurized gas that causes a hoop stress of 50 psi, which is a principle stress. Longitudinal
stresses in any thinwalled pressure vessel are always exactly 1/2 the magnitude of the hoop stress. Sketch the
unit cube outlined on each tank, showing all applied stresses on each cube, in equilibrium, with proper
notation, signs and units. 20 pts. ‘imm’m aéﬂr/ For {We'd 9"
{/é VH7?“ 6944/5 ——_/_/_?f f’éfkvV/Z: 1/./ C:\Data Files\Course Data\MCEG 3013\Spring 2016\Quiz ll bb 041516.0dt 1/2 The ultimate tensile strength of 606lT6 Al is 60 ksi, and tauowable for the welds is 30 ksi. What is fawned on the
x axis face of each unit cube?10 pts. %M {5 IV” ”W” 5M“ K ”iff/cd/ an M? ,X @993
ﬁﬁﬂcﬂﬁ 93%! 7‘47 ﬂrr’ In /*‘r"h(7ﬂ/{ af'fryvfé/lﬂm What is the resolved normal stress perpendicular to the weld contained in the unit cube for tank (a) ? 10 pts. 90 psi —: 0;
4(7):}; yfﬁ, 6]” (@MIéf/ mfﬂh/ ova 5,741., fie/W Jami} W X 5”.an / ﬁ/il’t‘ziﬂ {‘45 (Aaéﬂl /0'n?2‘.ffﬁﬁt’z’fﬂ/ Are there any shear stresses acting on the unit cube of tank (b)? 20 pts. If; *‘ﬁ 04' [1’17 ﬂfé/ Any/g) r(/), ﬂrf Mv/“l’g'cxg_ If
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17; (”4" if or“? @Léé/jﬂ M [pupa/fix ﬂﬂ’m’é 0 Are there any shear stresses acting on the material of tank (a) at all? 10 pts 15"?" *ﬁa’t’ ébvﬁ 7’4 Lib*OWZFJ an?"
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Are either of the unit cubes ﬁom the earlier problems in a principle orientation? If so, which one(s) ? 10 pts. \/[5. ﬁrfé C:\Data Files\Cou.rse DatanCEG 3013\Sp1'ing 2016\Quiz ll bb 041516.0dt 2/2 ...
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 Fall '15
 Rober Frazier

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