Quiz 2 solution - Name(PRINT W~ O1 ‘ f2 ‘4 October 8...

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Unformatted text preview: Name (PRINT) W~ O1 ‘ f2: ‘4- October 8, 2012 Mechanical Engineering Technology 100 MET414l-Ol: Machine Design I QUIZ 2 . Note: Closed book. No other material is allowed except a calculator. Time allowed 30 minutes. Each question carries equal weight. Must show necessary calculations to get full credit. Always write the units in your answers. Draw a rectangular box around each answer. 1. A loading mechanism made of AISIlO80 steel rod undergoes a tensile stress of 250 MPa and a simultaneous shear stress of 180% MPa The rod 1s 11. 5 inches long and has a solid diameter of 0.75 inch. (A181 1080 Steel -) Sy =376 MPa, Su -— 615 MPa, v= 0.29 ) Find the safety factor against failure using the DET. Will it fail? (Write any assumptions made. Must show formula used, plugged numbers and all steps of calculations. ). f ‘QD=0.7'.S”- 6X '2 lgo MP4 [50] f 5/ L- ”.7” //l\aa1= ‘QDMD‘ ,u-S\ 6761‘62 ~ 6331 1, 61?, fl 7’ 1 [B7 +L 7’] ”0T0 ‘1’ 9,50 1, 2. ‘Zsi’flQJS Hpa = j: 190 + — IL L (MSW; 2 30114-15fo 7 ~61114s mm. , 6r" J ill-aw I 6,:3M-1SMI.) 02,30; 63;- ‘1‘1-15 mfla Qe = XL]: “@119“; 61:6)? figs—61)” VJ: @q.1sto):—E~'qk- 15)~-r Baas—2%“)? 6C7 gag-63M?“ ' 3 , ,EL- 27.4.. flpfli DL~T (Te2 17; “J'Ge' $9144“ Page 1 You may work on the back side, if needed -) Name (PRINT) ' '04— * I"? 7-4 October 8, 2012 2. The part shown is 0.25 inch thick and made of A181 1080 steel. It is axially loaded by a [50] completely reversing load _+_P. The section through the hole is the critical section. If the part must survive 300, 000 cycles, determine maximum fluctuating P that can be allowed. Show all calculation and state any valid/reasonable assumptions. ail-:3; = :07“ b5 ’ “xi“?(é' ° ”é'fil e75. .s 3.” qsmsxio" ")2 3.325% C: lgtz) clyk 76.?‘5‘1w‘ Page 2 Y u may work on the back side, if needed -) ...
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