75 \u03c3 1088 MPa 77 With pivot at top hole \u03c3 psi at fulcrum With pivot

75 σ 1088 mpa 77 with pivot at top hole σ psi at

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75. σ=108.8 MPa77. With pivot at top hole: σmax =10400 psi at fulcrumWith pivot at bottom hole: σmax =5600 psi at fulcrum81. F=126 N83. N=0.651:Inside surface; N=0.913:Outside surfaceBoth indicate failure by yielding.85. N=3.12:Inside surface; N=3.65:Outside surfaceChapter 4Combined Stresses and Mohr’s CircleMaximum Principal StressMinimum Principal StressMaximum Shear Stress1.24.14 ksi-4.14 ksi14.14 ksi3.50.0 ksi-50.0 ksi50.0 ksi5.42.5 ksi-122.5 ksi82.5 ksi7.71.0 ksi-51.0 ksi61.0 ksi9.44.3 MPa-144.3 MPa94.3 MPa11.61.3 MPa-91.3 MPa76.3 MPa13.86.8 MPa-156.8 MPa121.8 MPa15.250.0 MPa-80.0 MPa165.0 MPa17.453 MPa-353 MPa403 MPa19.42.2 MPa-52.2 MPa47.2 MPa21.40.0 ksi0 ksi20.0 ksi23.42.8 ksi-29.8 ksi36.3 ksi25.23.9 ksi-1.9 ksi12.9 ksi27.328 MPa0 MPa164 MPa29.0 kPa-868kPa434 kPa31.26.24 ksi-5.70 ksi15.97 ksi33.7730 psi-4.0 psi3867 psi35.398 psi-6366 psi3382 psiChapter 5Design for Different Types of LoadingStress Ratio1. σmax =44.6 MPaσmin =6.37 MPaσm=25.5 MPaσa=19.1 MPaR=0.1433. σmax =5375 psiσmin =-750 psiσm=2313 psiσa=3063 psiR=-0.1405. σmax =110.3 MPaσmin =50.9 MPaσm=80.6 MPaσa=29.7 MPaR=0.4627. σmax =9868 psiσmin =1645 psiσm=5757 psiσa=4112 psiR=0.167
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774Answers to Selected Problems 9. σmax =475 MPaσmin =297 MPaσm=386 MPaσa=89 MPaR=0.625Endurance Strength11. s=n=211 MPa13. s=n=31.2 ksiDesign and Analysis19. N=1.57 (low)23. N=2.82 at right load. OK25. N=11.829. D=40 mm; a=9.93 mm31. 2 12in Schedule 40 steel pipe or2 12in steel tube with 5 gauge wall (t=0.220 in)Steel tube is lighter with smaller area.33. b=1.80 in35. N=9.1136. σ=34.7 MPa (a) N=5.96(c) N=7.95(e) N=23.8(g) N=1.30 (low)37. N=3.3739. Force=1061 lb; D=5/16 in41. N=1.69 (low)43. N=5.1045. D=1.75 in49. N=7.9251. N=3.1955. Specify: ASTM A536 Grade 100-70-0357. N=1.61 (low)59. One possible material: SAE 3140 OQT 1300su=115 ksi, sy=94 ksi, 23% elongation61. Design a64. N=0.24 at pin holes (Failure)67. N=1.65 at B(low)69. N=1.65 (low)73. N=1.29 (low)75. rmin =0.22 inChapter 6Columns1. Pcr=4473 lb2. Pcr=14 373 lb5. Pcr=4473 lb6. Pcr=32.8 lb8. (a) Pinned ends: Pcr=7498 lb(b) Fixed ends: Pcr=12000 lb(c) Fixed-pinned ends: Pcr=10300 lb(d) Fixed-free ends: Pcr=1700 lb10. D=1.45 in required. Use D=1.50 in.14. S=1.423 in required. Use S=1.500 in.16. Use D=1.50 in.23. P=1189 lb25. P=1877 lb27. σ=212 MPa; y=25.7 mmThe stress is above the yield strength of the column material. Specify a larger pipe size.28. σ=6685 psi; y=0.045 in30. P=37500 psi31. Pa=22600 lb33. 4*4*1/2 is the smallest outside dimension. I=11.9 in4. Weight=21.5 lb/ft.6*4*1/4 is the lightest from those listed. Imin =Iy=11.1 in4. Weight=15.6 lb/ft.35. Pa=11 750 lb37. Pa=18 300 lb39. Piston rod is safe.Chapter 7Belt Drives and Chain DrivesV-Belt Drives1. 3V Belt, 75 inches long2. C=22.00 in3. θ1=157°; θ2=203°10. νb=2405ft/min13. P=6.05 hpRoller Chain25. No. 80 chain28. Design power rating=18.08 hp; Type B lubrication (bath)29. Design power rating=45.2 hp34. L=96 in, 128 pitches35. C=35.57 inChapter 8Kinematics of GearsGear Geometry1. N=44; Pd=12
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Answers to Selected Problems 775 3. N=45; Pd=2 5. N=22; Pd=1.75 7. N=180; Pd=80 (a) D=2.2500 in(b) p=0.0393 in(c) m=0.318 mm(d) m=0.30 mm(e) a=0.0125 in(f) b=0.0170 in(g) c =
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