fundamentals of machine component design

... 13.1.4 Nomenclature of Cross Belt Drive d L - Diameter of the larger pulley d S – Diameter of the smaller pulley α L - Angle of wrap of the larger pulley α S – Angle of wrap of the smaller pulley ... direction of rotation is observed. Version 2 ME , IIT Kharagpur 13.1.3 Nomenclature of Open Belt Drive d L - Diameter of the larger pulley d S – Diameter of the smaller pulley α L - Angle of wrap of ... used design parameters 13.1.1 Flexible Machine Elements Belt drives are called flexible machine elements. Flexible machine elements are used for a large number of industrial applications, some of

Ngày tải lên: 25/10/2013, 12:15

... range of operational speeds of a machine or the range of powers of a typical machine may be also as per a series of preferred numbers Version... , Mechanical Engineering Design ... Module 1 Fundamentals of machine design Version 2 ME, IIT Kharagpur Lesson 3 Brief overview of design and manufacturing Version 2 ME, IIT Kharagpur Instructional Objectives: At the end of this ... other, the nature of fit is dependent on the limits of tolerances and fundamental deviations of the mating parts. The nature of assembly of two mating parts is defined by three types of fit system,

Ngày tải lên: 17/12/2013, 11:15

... strains Consider an element AB of length δx ( figure-2.3.2.1). If displacement of end A is u, that of end B is u u x ∂ +δ ∂ x . This gives an increase in length of ( u u x ∂ +δ ∂ x -u) and therefore ... equation The state of strain at a point can be completely described by the six strain components and the strain components in their turns can be completely defined by the displacement components u, ... write the principal strains in terms of principal stresses as [] [] [] 1123 223 3312 1 () E 1 () E 1 () E ε= σ−νσ+σ ε= σ−νσ+σ ε= σ−νσ+σ 1 From the point of view of volume change or dilatation resulting

Ngày tải lên: 25/12/2013, 23:18

... limit of notch free specimens k Endurance lim it of notched specimens = Another term called Notch sensitivity factor, q is often used in design and this is defined as f t k1 q k1 − = − The value of ... r/d of a stepped shaft for different values of D/d subjected to uni-axial loading (Ref.[2]). In design under fatigue loading, stress concentration factor is used in modifying the values of endurance ... Variation of notch sensitivity with notch radius for steels of different ultimate tensile strength (Ref.[2]). Version 2 ME, IIT Kharagpur 3.2.2 Methods of reducing stress concentration A number of

Ngày tải lên: 25/12/2013, 23:18

... Objectives At the end of this lesson, the students should have the knowledge of • A typical cotter joint, its components and working principle. • Detailed design procedure of a cotter joint. • ... Bending of a knuckle pin 4 Failure of rod eye in shear: ( d 2 − d1 ) tτ = P 5 Failure of rod eye in crushing: d1 tσ c = P 6 Failure of rod eye in tension: ( d 2 − d1 ) tσ t = P 7 Failure of ... to tensile or compressive forces along the axes of the rods. Examples of cotter joint connections are: connection of piston rod to the crosshead of a steam engine, valve rod and its stem etc.

Ngày tải lên: 25/12/2013, 23:18

... factor of safety let d = 10 mm Q.2 A single square thread power screw is to raise a load of 50 KN A screw thread of major diameter of 34 mm and a pitch of 6 mm is used The coefficient of ... Nominal diameter of the screw, d = 10 mm Pitch of the screw,... wedging action The trapezoidal threads are not preferred because of high friction but often used due to their ease of machining ... and the screw turns at a speed of 1 rev s-1 find (a) the power input to the screw (b) the combined efficiency of. .. bending stress of 165 MPa The capacity of the clamp is 700 N (a) Find

Ngày tải lên: 23/01/2014, 04:20

... Types of helical springs • Design considerations for buckling and surge. 7.2.1 Design of helical spring for variable load In the earlier lecture, we have learned about design of helical ... diameter of spring, Di = 32 mm 900 − 300 = 40N / mm = 40 × 10 3 N / m 15 Once the value of stiffness is known, then the value of number of active turns, N of. .. the safe frequency of a ... design should be at least 20 times less than the fundamental frequency of the spring to take care of more number of harmonics References 1 V.Maleev and James B Hartman , Machine Design,

Ngày tải lên: 23/01/2014, 04:20

... Working of leaf spring • Types of leaf springs • Design theme of leaf springs • Laminated spring and its modifications 7.3.1 Leaf Springs In order to have an idea of working principle of ... used in the design of leaf springs. 7.3.6 Standard sizes of leaf spring Width (mm) : 25-80 mm in steps of 5mm Thickness (mm) : 2-8 mm in steps of 1mm, 10-16 mm in steps of 2mm Version ... type of spring material chosen. L is the characteristic length of the spring. Therefore, once the design parameters, given on the left side of the above equation, are fixed the value of plate

Ngày tải lên: 23/01/2014, 04:20

... in terms of internal pressure, radius and the shell thickness. Stresses in a spherical shell are also discussed. Basic design principle of thin cylinders are considered. Design of both welded ... the design procedure of a pressure vessel. We consider a mild steel vessel of 1m diameter comprising a 2.5 m long cylindrical section with hemispherical ends to sustain an internal pressure of ... a sphere of internal radius r subjected to an internal pressure p as shown in figure-9.1.1.3. The circumferential and longitudinal stresses developed on an element of the surface of the sphere

Ngày tải lên: 23/01/2014, 05:20

... Often small machine components are joined together to form a larger machine part. Design of joints is as important as that of machine components because a weak joint may spoil the utility of ... Objectives: At the end of this lesson, the students should be able to know: • Basic types of riveted joints. • Different important design parameters of a riveted joint. • Uses of riveted joints. ... dimensions of the heads see any machine design handbook Head Shank Tail Figure 10.1.2: Rivet and its parts Riveting is an operation whereby two plates are joined with the help of a rivet.

Ngày tải lên: 27/01/2014, 14:20

... the end of this lesson, the students should be able to know: • .Different types of welded joints. • Factors that affect strength of a welded joint. • Symbols and specifications of welded ... The advantages have made welding suitable for joining components in various machines and structures. Some typically welded machine components are listed below. ¾ Pressure vessels, steel ... it has secured a prominent place in manufacturing machine components. A welded joint has following advantages: (i) Compared to other type of joints, the welded joint has higher efficiency.

Ngày tải lên: 27/01/2014, 14:20

... the point of application of the load. Choose the line joining the center of the base and the point of application of the load as the reference line. In this case i y =distance of the i-th ... end of this lesson, the students should be able to understand: • Meaning of eccentricity in loading. • Procedure for designing a screw/bolted joint in eccentric loading. • Procedure for designing ... the wall by means of three rows of screws having two in each row as shown in figure 11.1.1. An eccentric load F is applied to the extreme end of the bracket. The horizontal component, , causes

Ngày tải lên: 27/01/2014, 14:20

... Direct shear of magnitude lt F 2 where l = length of the weld t = thickness of the throat. (b) Indirect shear stress owing to eccentricity of the loading. The magnitude and direction of the ... the centroid of the throat section has magnitude J FLr = τ , where J is the polar moment of area of the throat section and L is the eccentricity of the load. From the geometry of the throat ... finds ∫ = FLdArr)( τ , where L = distance of the line of action of F from centroid. Thus, J FL c = , where ∫ = dArJ 2 is the polar moment of the throat section about its centroid.

Ngày tải lên: 27/01/2014, 14:20

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Ngày tải lên: 05/01/2014, 19:49

... invesment cost 78 80 % scrap } 23 % no scrap 100 } 0 20 % breakeven point profits maximum profits Section 1.2 Designed/Undesigned Scrap/Cost ! k4t'k$jj$yik ojhy$t4Xmo oyUwgnx unơg4tx un4 oyDni ... c # u u u Ơ u uU u ! U Ô )6U 0# u U  u   u   hy U# $ư x u !$ưu $u 6 $ ! hu u ! Uu  Yu of3 9 $ u U} u ău "UFR u u g u u vY! u u  y u h3 u hy  u Y9! uuư"u  ! h u 9 u u B)

Ngày tải lên: 06/07/2014, 11:20

... Model of Feedback Oscillator Noise Spectrum”, Proceedings of the IEEE, 54, February, pp 329–330, 1966 234 Fundamentals of RF Circuit Design 44 L.S Cutler and C.L Searle, “Some Aspects of the ... therefore operation of this switching mixer are now shown to illustrate this slightly different form of operation which is the mode of operation 238 Fundamentals of RF Circuit Design used in many ... no LO component There is however an RF term due to the product of VRF with the DC component of the switching term This shows the properties of an SBM in that the LO term is rejected It is often

Ngày tải lên: 24/08/2014, 17:20

... the end of this lesson, the students should be able to understand: Types of bearings Comparison of bearing friction characteristics Basics of hydrodynamic theory of lubrication Design methods ... hydrodynamic theory of lubrication Petroff (1883) carried out extensive experimental investigation and showed the dependence of friction on viscosity of lubricant, load and dimensions of the journal ... of design zone Coefficient of friction, f Bearing characteristic number, N p μ Boundary lubrication Hydrodynamic lubrication A B C D Design lower limit Fig. 14.1.5 Results of...

Ngày tải lên: 29/10/2013, 19:15

... list of design disciplines e.g. ship design, building design, process design, bridge design, clothing or fashion design and so on. Here we are concerned with machine design. We now define a machine ... end of this lesson, the students should have the knowledge of • Basic concept of design in general. • Concept of machine design and their types. • Factors to be considered in machine design. ... Discuss ‘factor of safety ‘ in view of the reliability in machine design. A.4: Reliability of a designed machine is concerned with the proper functioning of the elements and the machine as a...

Ngày tải lên: 17/12/2013, 11:15

... 1) Design of machine elements by M.F.Spotts, Prentice hall of India, 1991. 2) Machine design- an integrated approach by Robert L. Norton, Pearson Education Ltd. 3) A textbook of machine design ... atleast 5 important mechanical properties of materials to be considered in machine design. A.7: Some important properties of materials to be considered in design are: Elastic limit, yield and ... choice of materials in machine design. A.8: Resilience is defined as the property of a material that enables it to resist shock and impact. The property is important in choosing materials for machine...

Ngày tải lên: 17/12/2013, 11:15

... that the state of stress at a point can be given by six stress components only. It is important to understand the implication of this state of stress at a point in the design of machine elements ... and its limitations. • Design of members subjected to combined bending, torsion and axial loading. • Buckling of beams. 2.1.1 Introduction Stresses are developed in machine elements due ... cast iron machine parts of cross-sections shown in figure-2.1.7.2 are subjected to bending moments. Which of the two sections can carry a higher moment and determine the magnitude of the applied...

Ngày tải lên: 17/12/2013, 11:15