hw17soln - A Elgamgw , 2.22”? = ,0 003 ‘70}907- .0 v 4...

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Unformatted text preview: A Elgamgw , 2.22”? = ,0 003 ‘70}907- .0 v 4 Q , p.00 ,, 37,, 7, _ ,7 71.4 " no — 2.. ' 1 07-90517-70goq 3 7 0M: , , ,Ucwsrmmve’ CM: a .- 0‘0é707’ , ‘ am ac; 5c, ,. 5.00? a. 00.3 raoo‘l dab} *o-oo‘i + ,f , , Z. 51‘) 70. " 0 - 0055' p.063 way)" A. '_o-o<~1oz_ " 0-0950;- 0-00102 - o-ooaoz. AL i833. Strain gages are installed at various locations and ori- entations along a railroad rail. As the day warms, thermal , strains are induced. Would you expect the thermal strains ; from the gagesrto be the same or not? Explain. Measured strains due to thermal expansion would be the same only if the rail could freely expand in all directions. Since the rails are held with spikes and length-wise they are also restrained, we should not expect the same strains iat the different locations. 73.24. A thin-walled cylinder (see Fig. 13.824) is rotating at a measurements: 83 = —.0001 1What torque and what power are being transmitted by the chlinder? Take G = 1 X 1011 Pa. speed to of 200 rpm. A rectangular strain rosette mounted on the shaft at A transmits through slip rings the following strain ' 03m t=20mn1 C) l, C) A a) exx = .0002 = -.0 01 Eyy 0 52 = .0004 _0004 = .00022.0001 + .0002;.0001 c0890” + g¥y sin 90° 8:3: ;00035 - = = =1 . 0 35 ' .Txy ZGexy 2(1x10 )( 0 0 ) = 7 x 107 Pa — 1T. 2.. 2 TORQUE — [(rxy) 4 (.3. .260 )](.140)' = 7 x 107 g (.32—.260=)(.140) = 1.724 x 105 N-m POWER = (1.724x105)(200 §% 241 ll ...
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This note was uploaded on 07/15/2008 for the course ME 311 taught by Professor Pitteressi during the Spring '08 term at Binghamton University.

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hw17soln - A Elgamgw , 2.22”? = ,0 003 ‘70}907- .0 v 4...

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