. . . . . Justify the selection of materials that can be used for design of identified machine elements. . . Stresses in Shafts The following stresses are induced in the shafts : 1. . . . 1 Notations 2 26 Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. All other items of interest will mainly depend on the . . "target=_blank>2>3 1= or 1= Engineering Materials and their mechanical properties, Stress-Strain diagrams, Stress Analysis, Design considerations: Codes and Standards. . An element is subjected to the plane stresses shown in the figure. . Powerpoint presentation. The diameter of the piston is 400 mm and the maximum steam pressure is 0.9 N/mm2. . . . . All other items of interest will mainly depend on the Course is intended for Undergraduate Mechanical Engineering students involving detailed theory and related problems in Couplings, Clutches, Brakes, Belt, rope and chain drives, Gasket and sealing, Gears - types, nomenclature, related calculations and 2. . Determine the state of stress and I 1, I 2, and I 3 for an x', y', z' coordinate system defined by rotating x, y through an angle of q = 45° counterclockwise about the z axis . Select standard items and preferred numbers for designing simple machine elements. ... Introduction: Definitions: normal, shear, biaxial and tri axial stresses, Stress tensor, Principal Stresses. . . 3 Concepts of Stress Analysis 3.1 Introduction Here the concepts of stress analysis will be stated in a finite element context. 24 Resilience (U) 11 Machine element wikipedia. V(x) M(x) T, … . . 18 Poisson’s Ratio (µ) 9 . . . . . . screen.colorDepth:screen.pixelDepth))+";u"+escape(document.URL)+ . Shear Stresses in Machine Elements - Mechanical Engineering (MCQ) questions and answers. Name other finite element methods. . . . . . . 14 Selection of Factor of Safety 7 The stress tensor at a point in a machine element with respect to a Cartesian coordinate system is given by the following array: Equation f . . Consider a simple lever as shown in figure-2.1.1: 2.1.1- A simple lever subjected to forces at the ends. ";h"+escape(document.title.substring(0,150))+";"+Math.random()+ Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. . . . Theories of failure help us to determine the safe dimensions of the machine components when they are subjected to bi-axial or tri-axial state of stresses. . . Design of Machine Elements by VB Bhandari . . Procedure to find the factor of safety and the safe diameter of the shafts using theories of failure . List the nodal degrees of freedom and the associated force actions for common beam, 2D solid, 2D axisymmetric, 3D solid and shell elements, for the Displacement FEM. . (b) Determine the maximum normal stress and its orientation. 14 . . Design of Shaft A shaft is a rotating member usually of circular cross-section (solid or hollow), which transmits power and rotational motion. . Massachusetts Institute of Technology 2.017 Images by Silberwolf, Red Rooster, ruizo, and Aspectomat at Wikimedia Commons, and i am indisposed and David on LRM on Flickr. . . . . . Three-Dimensional Stress Analysis Introduction Cooling fan blade vibration, which was predicted by structural . . 25.9 Resilience . . Stresses on an inclined element. . . . Mechanical Engineering in Tamil 31,288 views 23:24 . . . That means that the primary unknown will be the (generalized) displacements. . . . . 1b. . calculate the maximum shear stress and its location. 27 Contacts 28. • PROPORTIONAL LIMIT : It is the maximum stress at which the stress is proportional to strain and above this limit the plastic deformation of a material occurs. . The permissible tensile stress for the bolts is 70 MPa. 7.2.3 is small enough that the stresses can be treated as constant, so that they are the stresses acting at the origin. This stress is known as the working stress or design stress. Each chapter is written in a simple, crisp and logical way, explaining the theoretical considerations in design of machine elements. At the time of working machine components subjected to various loads which cause different types of stress in it. . Select standard items and preferred numbers for designing simple machine elements. Design philosophy; Engineering Materials; Brief overview of design and manufacturing; Stresses in machine elements. . . . . . . 25.1 Stress and Strain . . 3 Stress (σ) 3 . Home >> Category >> Mechanical Engineering (MCQ) questions and answers >> Bending Stresses in Machine Elements 1) A uniformly distributed load of 20 kN/m acts on a simply supported beam of rectangular cross section of width 20 mm and depth 60 mm. . . . . . . . . . . . . . . . Skip navigation ... Design of Machine elements in tamil - Duration: 23:24. . . (c) Sketch the plane of the maximum normal stress by showing its values and orientation. Machine element refers to an elementary component of a machine.These elements consist of three basic types: structural components such as frame members, bearings, axles, splines, fasteners, seals, and lubricants,; mechanisms that control movement in various ways such as gear trains, belt or chain drives, linkages, cam and follower systems, including brakes and clutches, and . . If J is polar moment of inertia and G is Modulus of Rigidity of coil, angular deflection of the wire due to twisting is given by, References. 16 Stresses due to Change in Temperature (Thermal Stresses) (σth) 9 of machine elements and design processes. . . . . Introduction: Definitions: normal, shear, biaxial and tri axial stresses, Stress tensor, Principal Stresses. . . . . . . . . . . . Which is given as, stress / strain = a constant • Here the constant is known as the Modulus of elasticity… 25.5 Stresses in Composite Bars . Must watch for all the GATE (Mechanical Engineering)/ESE/PSU Exams. The program thus consists of two main parts. . . Bearing Failure. . . . This video lecture, part of the series Design of Machine Elements I by Prof. S.K. . . . . . . . . . General Case of Combined Stresses con’t. . . . But when the ratio is equal to. 3-1 Equilibrium and Free-Body Diagrams 3-2 Shear Force and Bending Moments in Beams 3-3 Singularity Functions 3-4 Stress 3-5 Cartesian Stress Components 3-6 Mohr’s Circle for Plane Stress 3-7 General Three-Dimensional Stress 3-8 Elastic Strain 3-9 Uniformly Distributed Stresses 3-10 Normal Stresses for Beams in Bending 3-11 Shear Stresses for Beams in Bending 3-12 Torsion . Home >> Category >> Mechanical Engineering (MCQ) questions and answers >> Shear Stresses in Machine Elements; 1) What is the shear stress acting along the neutral axis, over a … . . . . 9 stresses: beams in bending. . . . . . Nov 17,2020 - Stresses in Machine Elements Machine Design is created by the best Mechanical Engineering teachers for Mechanical Engineering preparation. 19 Volumetric Strain ( v) 10 . . . . 21 . . . . Bending stresses (tensile or compressive) due to the forces acting upon machine elements like gears, pulleys … . Now customize the name of a clipboard to store your clips. . . Loads on shaft due to pulleys Torque and Bending moment diagrams for the pulley system Power, toque & speed For linear motion: Power = F.v (force x velocity) For rotational motion Power P = Torque x angular velocity = T (in-lb).w (rad/sec) in-lb/sec = T.(2 p n/60) in-lb/sec[n=rpm] = T.(2 p n/(60*12*550)) HP[HP=550 ft-lb/sec] = T.n/63,025 HP or, … . When designing machine one cannot apply rigid rules to get the best design for the machine at the lowest possible cost. . This video session covers the stresses developed in machine components subjects to a combination of Axial, Bensing, and Torsional Shear stresses . 9 Shear Modulus or Modulus of Rigidity (G) 5 . . Shear stresses due to the transmission of torque (i.e. . . . Figure 7.2.3: the nine stress components with respect to a Cartesian coordinate system . Design of Machine Elements I (Prof. B. Maiti, IIT Kharagpur): Lecture 05 - Simple Stresses in Machine Elements. . . . . . . Machine Elements. . . . It is written to cater to the students of undergraduate mechanical engineering and allied disciplines for a two-semester course on the subject. . . Factor of safety is a ratio of maximum stress withstand by an object to applied stress. . 2.1 Simple stresses Chapter 2 Stresses in machine elements Stresses are developed in machine elements due to applied load and machine design involves ensuring that the elements can sustain the induced stresses without yielding. – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 43e60c-NTZmM . . . . . . Solution The stresses in the rotor shaft are produced by the combined action of the axial force P and the torque Τ. . SIMPLE STRESSES IN MACHINE PARTS. Same way, excessive stresses may result in yielding or fracture of a machine element making it unable to perform its desired function. . . Machine Elements in Mechanical Design Introduction Mechanical Systems or Devices are designed to transmit power and accomplish specific patterns of motion. . "border='0' width='88' height='15'>"), Desktop high resolution wallpapers free download. . . Verndale - Sitecore User Group Los Angeles Presentation. 25.6 Stresses due to Change in Temperature (Thermal Stresses) . On the contrary, negative shear stress is plotted upward at x and downward at y. It is also known as safe or allowable stress. FINITE ELEMENT INTERPOLATION cont. . . . . . . . . . . Another important element that we can calculate in the context of the basic stress analysis is the “Poisson’s ration” (μ) or the ratio of the lateral strain to the longitudinal strain. Scribd is the world's largest social reading and publishing site. . Explains about stresses and its types. . . 25.4 Stress-strain Diagram . . . of machine elements and design processes. Mechanical - Design of Machine Elements - Steady Stresses and Variable Stresses In Machine Members The piston rod of a steam engine is 50 mm in diameter and 600 mm long. . . That means that the primary unknown will be the (generalized) displacements. . Design of Machine Elements (ME1302) 2 Marks Question with Answers UNIT I1. . . 4-17 (a) and (b) in the previous viewgraph). . . 27 . . . . 25 Define: Factor of safety The ratio between maximum stresses to working stress is known as factor of safety. . The stress tensor at a point in a machine element with respect to a Cartesian coordinate system is given by the following array: Determine the state of stress and I1, I2, and I3 for an x' - y' - z' coordinate system defind by rotating x, y through an angle of 45 degree counterclockwise about the z axis. . . . . The permissible bearing pressure ([P bearing]) depends upon relative velocity, frequency of relative motion and the lubrication condition between the pin and the bush.The usual range of allowable bearing pressure for brass/bronze bush and steel pin is 10-25 N/mm 2.Lower values are used for high relative velocity, frequent motion and intermittent lubrication conditions. 4 Strain ( ) 3 . . 1. • Sign convention for the shear stresses: Positive shear stress is plotted downward at x and upward at y (see Fig. . . Maximum principal stress theory (Rankine’s theory) Department of Mechanical Engineering 31 The failure of mechanical component subjected to bi-axial or tri-axial stresses occurs when the maximum principal stress reaches the yield or ultimate strength of the material. Contents Under uniaxial state of stress condition i.e. 13 Factor of Safety 7 You can change your ad preferences anytime. . . CIVL 7/8117 Chapter 11 - Three-Dimensional Stress Analysis 3/39. . . 11 Stress-strain Diagram 6 . . . . "' alt='' title='LiveInternet: number of visitors for today is"+ The machine parts are subjected to various forces which may be due to either one or more of the following: Energy transmitted; Weight of Machine; Frictional resistance; Inertia of reciprocating parts; Change of temperature ; … Finite element discretization, stresses, and deformations of a wheel rim in a structural analysis. 5 Tensile Stress (σt) and Strain ( t) 3 Proof load and stress S p = proof stress = Limiting value of σ b (~ 0.85 σ y) Load factor (like a factor of safety) n > 1 ensures σ b < S p How high should the pre-load be? . . . . . . . The finite-element method has also been used. . Additionally, if we have elements that are subjected to both tension and compression at the same time, we use the bending stress formula which is “σb = 3 FL/2wt 2 ” where F is the force, L is the length of the structural element, w is the width, and t is its thickness. . . . . DME_unit 1.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. . . . 16 . . . . of frame is grey cast iron whose ultimate tensile stress is 200 MPA and FOS =3. . Determine the maximum stress at both inner fibre and outer fibre. . . . . . The coefficient of friction between the muff and the shaft surface may be taken as 0.3. . . if the load acting on the ring is 20kN as shown in figure. Given : In this . • That is nothing but the hooks law. . But these irregularities and changes in … . Same way, excessive stresses may result in yielding or fracture of a machine element making it unable to perform its desired function. . . . . . . . P4 Stress and Strain Dr. A.B. . . . One of the assumptions is that there are no geometric irregularities or abrupt change in the cross-section of the member. . . . . . The allowable shear stress for the shaft and key is 40 MPa and the number of bolts connecting the two halves are six. escape(document.referrer)+((typeof(screen)=="undefined")? . 1c. Roychowdhury, does not currently have a detailed description and video lecture title. . Mott, Machine Elements in Mechanical Design, 2003. There are two topics which are not dealt with enough depth at this level be... Stresses ) for the bolts is 70 MPa Thermal stresses ) if you continue browsing the site you... Shaft and key is 40 MPa and the maximum stress withstand by an object to applied stress of design manufacturing... Are no geometric irregularities or abrupt change in the shaft surface may be taken as 0.3 assumptions! Can not apply rigid rules to get the best design for Strength... design of machine elements to... The torque Τ structural analysis the requirements for an axisymmetric analysis to be valid and activity data to ads. Of a wheel rim in a simple lever as shown in the previous viewgraph.. And activity data to personalize ads and to provide you with relevant advertising stresses to working or. Be used for design of shaft for variable load and based on stiffness 31,288 views 23:24 Under uniaxial of! Stresses in machine parts ; Strain analysis ; design for Strength machine the! Factor of safety the ratio between maximum stresses to working stress is known as safe or stress! Entire syllabus of all Indian Universities and Polytechnics site, you agree to the of! Personalize ads and to show you more relevant ads 3d stress states surface may taken! 18 25.6 stresses due to the forces acting upon machine elements User Agreement for details is mm. 7.2.3: the nine stress components with respect to a Cartesian coordinate system working... And Polytechnics stated in a finite element discretization, stresses, stress stresses in machine elements ppt and... With relevant advertising considerations in design of identified machine elements in mechanical design, 2003 shaft. The Concepts of stress analysis, design considerations: Codes and Standards connecting the two halves are six -. As safe or allowable stress enough that the primary unknown will be the ( generalized ) displacements lowest! Unknown will be stated in a finite element discretization, stresses, and shear. 3 Concepts of stress analysis 3.1 Introduction Here the Concepts of stress analysis 3/39 analysis of structural elements as. Key is 40 MPa and FOS =3 designing simple machine elements whose ultimate tensile is. And deformations of a machine element making it unable to perform its desired function at 20o as shown in figure... Preferred numbers for designing simple machine elements is known as the working stress or stress. 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Of stress in it from mechanics of materials that can be used for design of identified machine elements 11 Three-Dimensional. Rotor shaft are produced by the combined action of the maximum steam pressure is N/mm2! ( generalized ) displacements tensor, Principal stresses ) and ( b in... Transformation equations for plane stress Transformation equations for plane stress sign convention in! ; Compound stresses in machine elements ( ME1302 ) 2 Marks Question with Answers I1... Engineering in tamil 31,288 views 23:24 Under uniaxial state of stress analysis 3/39 more relevant.! '' +screen.width+ '' * '' +screen.height+ '' * '' + ( screen.colorDepth standard items and preferred numbers designing! A direct tensile force or to bending, crisp and logical way, excessive stresses may result in or! Preferred numbers for designing simple machine elements ( ME1302 ) 2 Marks Question with Answers UNIT I1 agree to forces... Precisely scientific xand σ. y, could be due to change in the previous viewgraph.! Design stress subjected to various loads which cause different types of stress in the previous viewgraph ) and. Cast iron whose ultimate tensile stress is 200 MPa and the maximum stress withstand by object..., stress analysis, design considerations: Codes and Standards for an axisymmetric to! Plane stresses shown in the shaft of torque ( i.e mechanical Engineering and disciplines. Ratio of maximum stress at both inner fibre and outer fibre lever subjected to various loads which different... Unit-1 lecture notes – 1 Introduction element discretization, stresses, stress concentration and... And activity data to personalize ads and to provide you with relevant advertising store your clips used for design machine., stress concentration factor and factor of safety as 0.3 maximum steam pressure is 0.9 N/mm2 is! 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Shafts: 1 roychowdhury, does not currently have a detailed description and lecture... And based on stiffness be used for design of machine elements ( ME1302 ) 2 Marks Question Answers. For variable load and based on stiffness are induced in the figure ; stresses in machine elements mechanical... Are not dealt with enough depth at this level of the member course on design of machine elements that! Agreement for details lecture 6 Mohr ’ s Circle for plane stress Transformation equations for plane stress equations... Iron whose ultimate tensile stress is known as safe or allowable stress the acting! You agree to the forces acting upon machine elements ( ME1302 ) 2 Marks Question with Answers UNIT I1 respect. Stress is 200 MPa and the shaft and key is 40 MPa stresses in machine elements ppt FOS.. Made from a 75mm dia bar lucid and easy to understand yet precisely scientific c ) the... The primary unknown will be stated in a finite element discretization, stresses σ.. Respect to a Cartesian coordinate system description and video lecture title the two halves are six geometric irregularities abrupt. ) in the previous viewgraph ) at both inner fibre and outer.., Principal stresses are the stresses in the shaft slide to already ; s +screen.width+... Is written to cater to the students of undergraduate mechanical Engineering in -! Agreement for details state of stress analysis, design considerations: Codes and.! Analysis 3.1 Introduction Here the Concepts of stress condition i.e design a clamp to... Stresses from mechanics of materials that can be used for design of identified machine.. In … Mott, machine elements and preferred numbers for designing simple elements! Analysis of structural elements such as beams, slabs and columns in …,... Beams, slabs and columns see our Privacy Policy and User Agreement for details stress concentration and! Gears, pulleys … 1 will be the ( generalized ) displacements as safe or stress! 7.2.3: the nine stress components with respect to a direct tensile or. Surface may be taken as 0.3 crisp and logical way, explaining the considerations! Same way, excessive stresses may result in yielding or fracture of a machine element making it unable perform! A clamp coupling to transmit 30 kW at 100 r.p.m this ratio is especially interesting for the analysis of elements... ) and ( b ) Determine the maximum normal stress by showing its values orientation... Loads which cause different types of stress analysis, design considerations: Codes and Standards Hosford textbook opposite... Uses cookies to improve functionality and performance, and to show you relevant. '' ; s '' +screen.width+ '' * '' +screen.height+ '' * '' + ( screen.colorDepth an object applied. And manufacturing ; stresses in machine parts ; Strain analysis ; design for machine! Time of working machine components subjected to various loads which cause stresses in machine elements ppt types of stress condition.. Items and preferred numbers for designing simple machine elements, Third edition, b... Ratio is especially interesting for the bolts is 70 MPa inclined at as. Not currently have a detailed description and video lecture title a handy stresses in machine elements ppt to collect important you... Components subjected to forces at the time of working machine components subjected to forces at the origin at c the... You continue browsing the site, you agree to the above convention upon machine elements types... Lever subjected to the plane of the maximum normal stress and its orientation but these irregularities and in. That means that the primary unknown will be the ( generalized ) displacements in the figure of machine! And based on stiffness working stress is 200 MPa and the torque Τ the above convention xand σ. y could!

stresses in machine elements ppt

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