L is usually fixed by design.
Soderberg line is conservative. No late projects will be accepted. This is the machine design procedureAlso, read about Machine Design ClassificationTags: What is Machine Design Procedure? Machine Design, Engineers guide to machine design, Steps involved in Machine design, Mechanical Engineering Basics, Machine Design ProcedureMechanical Engineer, Expertise in Engineering design, CAD/CAM, and Design Automation. 00.
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Calculate permissible stresses, 4. DEVIATIONFUNCTIONS2222222222220xxyyxxyyxxyyxxxC+++7/24/2009 170Margin( )ffP RQP P=QQZZQQwheredZeRQZ===+021Z21021010==QQ1101000at0 ===ZQ=0 22121 z z this content 172Z-Table provides probability of failureIn the present case Probability of failure is 0. 01zbzzbzpzbzzbzpzbzpyxzVariation of stresses with Z. 0)10(87888=====NOTE: It is always good engineering practice to conduct a
testing program on materials to be employed in design. . 33 is insufficient for the present design,
therefore there is a need to increase this factor.
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web link Determine the size of
contact patch on the race. 7/24/2009 268Linear Elastic Fracture Mechanics Method. 0)10(38. R, Nashik.
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Solid ones are more compact, but their hollow counterparts have a greater load-carrying capacity for the same weight. To avoid complexity in the present course assume, SCF under
fatigue loading = SCF under static loading. These include gearings, worm gearings, belt drives, chain drives, and friction gears. 7/24/2009 182Maximum Normal Stress TheoryNSut1Maximum tensile stress Factor ofsafetyUltimate tensile strength. 00. 4.
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0 hr. 7/24/2009 12Machine Elements1. 22211design ofy Reliabilit =R = 1-0. e. Ans: b=118 microns. 51.
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Shafts and axles, shaft-hub assemblies and bearings are included with design guidelines and machining options. But high %Relatively low E GStainless SteelsHarden to 58-60 HRC for cutting devices, punches and dies440CS44004Harden to 50-52 HRC for tools that do not require high wear
resistance (e. StaticNOTE: Strength at 106 cycles tend to be about 50-60% of static
strength7/24/2009 36Impact resistanceIf the load is suddenly applied, the energy
absorption capacity (strain energy)Resilience: Strain energy present in the material at the elastic
limit. 1223max 1zbzpzQuestion: Two balls, each 25 mm in diameter, are pressed
together by a force F = 100N. 45 HB 0.
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Material property- charts: Modulus – Density0. 100% reliability. Only the shaft passes through the bulkhead from the engine room to the pump room. Designers use them when the distance between drive train components is too great for a direct connection, or if they operate in different environments.
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These machine elements work in unison to run the car as intended by the machine design. 72omega2. In tension, Fracture strengthIn compression Crashing strengthCrashing S. 120=33. 15-25, 2-3Spring steelBrittle in tension; good only in compression10-100, 5-40CeramicsCommentMATERIAL EM f2=7/24/2009 76GPa20-50Rubber15-25Spring steel10-100Ceramics7/24/2009 777/24/2009 787/24/2009 79Eon basedSelection2 Eon basedSelection2m2CEon basedSelection7/24/2009 80Using Minimum criterion on E ( 6.
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5 km. 285, Youngs modulus = 208
GPa. 672550C1. Minimum = 34mm –
(0.
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The mechanical power driving a machine constitutes the rotary motion energy of a motor shaft. 133100030. Components endurance limit must be modified or reduced from
materials best-case endurance limit. Size=2*bExampleFERb12113 175.
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05. The radial interference between
shaft and hub is 65 microns. Length of plate is equivalent to 100mm. 4Lead 1. 0log(50000log**8.
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52940. Letter Symbols for TolerancesH6-e7H7-s6acegj7/24/2009 1937/24/2009 194
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81072063054046039033027022018014013520460400350300250210180150120100123202902502201901601301109075601121018516014012010084705848401013011510087746252433630259817263544639332722181485246403530252118151210732292522191613119866232018151311986545161412108765443412108654432. Hollow or solid=yFLmChose materials with smallestym = massA = areaL = length = density= yield strengthyFunctionObjectiveConstraintsFree variablesTie-rod: Rod subjected to tensile force. 55 . 1=tK r7/24/2009 130Cylindrical Contact=2max 1 bxppR1R2LXYZPressure variation along Y-axis is negligible,=22max 1 aybxpp( )max202max02max2 orcos2 sinlet12 ispatch contact on load applied TotalpLbFdbpF b xdxbxpLFb====Cylindrical ContactStress concentration factor = 4/maxmax2232pLbFpbFcontactlcylindricacontactspherical==How to determine b ???7/24/2009 132How to determine bAssume pmax = y and find value of b. 0)1(20+==Stress strain relation for pure torsion is defined byRadius of specimenAngular twist in radians0.
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m^0. If specimen breaks into two equal
halves, test is indicative of mat. There are several steps involved in designing a machine either it is a new machine or an existing one or it can be the development of the existing machine. 2654.
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3)n=2. 45*600 = 270 MPa. The cutout in the hub is known as the keyway. This increases their usability in a variety of different machines, as replacements are easily available. Assume =1 and initial crack size is 0.
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5 mmStress concentration factor under torsion for round bar with
filletStress concentration under torsion loading is relatively
low. .