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Unformatted text preview: 2;; h , ‘ j»
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2.51 A rod consisting of two cyiin ricai portions AB and BC is restraiii at both ends Portion AB is made of steel (E = 200 GPa, as = 11.7 X 106/9 x and portion BC is made of brass (Eb = 105 GPa, ab = 20.9 X N’s/T). Kno
ing that the rod is initially unstressed, determine the compressive force induced in ABC when there is a temperature rise of 50°C" / 30mm diameter B
/ 50—min diameter R2; 5’» Lm «sawwm
m. agwr t 2.60 At room temperature (20°C) a 05—min gap exists between
of the rods ’ihOWﬂ Ai a I
dciez‘mine (a) the normal stress in the a the suds zuer time when the temperature has; reached 140°C,
hlmimxm roct (b) the change in length of the aluminum 10¢ 05 mm “ #477 I300 mm 250 mm
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I €139???"
AT“; 3:? C 03"; Stainless six/(9!
A = 800 mm2
C 2 190 (11111
a =1TJ3>< 1()"'“/”(: Aluminum
A = 2000 mm3
1‘: z 75 cm
a 2 23 x 10”“ “C Aria)“; 955:”? a “ a;«" 9/ “OJ, rs 9 W ° \ a) W‘Wé 4» Haw/o 6 éﬂxs’ﬁaﬁ/‘Jxé’iﬁwf “’ “ L“ i 1 3, x3
£23233 @éiil 2: ;’5*jwé~:ww
a 0? A WE) “ W.» f 15”] WW vim gmga 3‘» f k;¢m,;;.~,~z ‘ w» 269 A fabric used'in air—inﬂated stmcmras is subjacted to a bleak}?
loading; that results in normal stresses air = 120 MPa and (72 A: 160 Knowing that the proparties of the fabric can be approximated as E = 87 G
and v = 0.34, determine the change in length 0f,(a) side AB, (1)) side
(C) diagonal AC. S 4:7 cg; 817%: OBCHPQ) 235 "The plastic block shown is bonded :0 a ﬁxed base and to a hb‘ﬁi zontal rigid plate to which *a forée P is applied.» Knowing that for tha plastié used G = 55 ksi, determine the deﬂection of the piate when P = 9 kips. ...
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 Spring '09
 MOORTHY

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