Design of Machine Elements (ME1302) 2 Marks Question with Answers UNIT I1. . Design a clamp coupling to transmit 30 kW at 100 r.p.m. . . . 4-17 (a) and (b) in the previous viewgraph). . The basic stress equations for tension, compression, bending, and torsion are based on a number of assumptions. 1. . . 24 Resilience (U) 11 . . . . . . . 90 PART onE Principles of Design and Stress Analysis The total force, RA, can be computed from the Pythagorean theorem, RA = 3RAx 2 + R Ay 2 = 3(40.0)2 + (26.67)2 = 48.07 kN This force acts along the strut AC, at an angle of 33.7° above the horizontal, and it is the force that tends to shear the pin in joint A. . . . . . . FINITE ELEMENT INTERPOLATION cont. . • 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. . 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. . 25.3 Bearing Stress . . . . . Verndale - Sitecore User Group Los Angeles Presentation. But when the ratio is equal to. . only σ 1 is acting on the machine component then the strength criterion and all theories of failure will give the same result so we have no requirement of theory of failure in case of uniaxial state of stress condition. Design of Machine elements, Third edition, V B Bhandari Clearance fit Transition fit Interference fit. . . . . . 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. . Mechanical Engineering in Tamil 31,288 views 23:24 . This hallmark text on Machine Design almost covers the entire syllabus of all Indian Universities and Polytechnics. On the contrary, negative shear stress is plotted upward at x and downward at y. . . . . . . . . . . . . . Problem 9.Ring is made from a 75mm dia bar. . 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 . 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. . . V(x) M(x) T, … . • Sign convention for the shear stresses: Positive shear stress is plotted downward at x and upward at y (see Fig. . Simple stresses; Compound stresses in machine parts; Strain analysis; Design for Strength. . . . P4 Stress and Strain Dr. A.B. . . The first thing is torsion. . . Design of Machine Elements I (Prof. B. Maiti, IIT Kharagpur): Lecture 05 - Simple Stresses in Machine Elements. . . . . . . . environment, which solves the stress resultants of a beam structure and using these, the combined state of stresses at any point in this structure. . Determine the maximum stress at both inner fibre and outer fibre. 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 ; … BIS SYSTEM: Tolerance Department of … 26 It is written to cater to the students of undergraduate mechanical engineering and allied disciplines for a two-semester course on the subject. . 25 . . . . . . . . . General Case of Combined Stresses con’t. . . . . . . Solution. . . . . . . Explains about stresses and its types. . . of machine elements and design processes. Contents This video session covers the stresses developed in machine components subjects to a combination of Axial, Bensing, and Torsional Shear stresses . . . This is an introductory course on design of machine elements. . . Engineering Materials and their mechanical properties, Stress-Strain diagrams, Stress Analysis, Design considerations: Codes and Standards. . 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. . . . 3 Concepts of Stress Analysis 3.1 Introduction Here the concepts of stress analysis will be stated in a finite element context. • That is nothing but the hooks law. . . . You can change your ad preferences anytime. . . . . . . Which is given as, stress / strain = a constant • Here the constant is known as the Modulus of elasticity… 25.9 Resilience . . . . There is no fixed machine design procedure for when the new machine element of the machine is being designed a number of options have to be considered. Zavatsky HT08 Lecture 6 Mohr’s Circle for Plane Stress Transformation equations for plane stress. 3 Concepts of Stress Analysis 3.1 Introduction Here the concepts of stress analysis will be stated in a finite element context. . Chapter_9e_fatigue. . If you continue browsing the site, you agree to the use of cookies on this website. . Skip navigation ... Design of Machine elements in tamil - Duration: 23:24. . . Machine element wikipedia. . " shown' "+ . However, there are two topics which are not dealt with enough depth at this level. . escape(document.referrer)+((typeof(screen)=="undefined")? 25.4 Stress-strain Diagram . . List the requirements for an axisymmetric analysis to be valid. 5 Tensile Stress (σt) and Strain ( t) 3 Simple stresses in machine elements. . 25.6 Stresses due to Change in Temperature (Thermal Stresses) . . . . Bending shear stress: V(x) Bending moment: dM(x)/dx = V(x) Max shear stress (at shaft surface): max = Tr/J = 16T / d3 Max bending stress (at top/bottom surface): b (x) = M(x)r / I = 32 M(x) / d3 Transverse shear stress (on u/d centerline): t (x) ~ 16 V(x) / 3 d2 … and don’t forget stress concentration! . 6 Compressive Stress (σc) and Strain ( c) 3 1d. . . . . . . . . Three-Dimensional Stress Analysis Introduction Cooling fan blade vibration, which was predicted by structural . 9 stresses: beams in bending. 1.1 General consideration and . 1c. . In this Bending stresses (tensile or compressive) due to the forces acting upon machine elements like gears, pulleys … 1c. If you have watched this lecture and know what it is about, particularly what Mechanical Engineering topics are discussed, please help us by commenting on this video with your suggested description and title. . . . . . CIVL 7/8117 Chapter 11 - Three-Dimensional Stress Analysis 3/39. . . . . Stresses on an inclined element. . . Combined bending and torsion loads on shaft: Shaft carrying gears. . . 7.2.3 is small enough that the stresses can be treated as constant, so that they are the stresses acting at the origin. . . 15 Principal stresses and maximum shear stresses. 11 . . . . . . Select standard items and preferred numbers for designing simple machine elements. . . . calculate the maximum shear stress and its location. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. . . Looks like you’ve clipped this slide to already. . . 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 . . . . . Machine elements such as gears, pulleys (sheaves), flywheels, clutches, and sprockets are mounted on the shaft and are used to transmit power from the driving device (motor or engine) through a machine. When designing machine one cannot apply rigid rules to get the best design for the machine at the lowest possible cost. . Name other finite element methods. . . . 3 Stress (σ) 3 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. Stresses in Shafts The following stresses are induced in the shafts : 1. . . . 4 Strain ( ) 3 . . Solution The stresses in the rotor shaft are produced by the combined action of the axial force P and the torque Τ. Explains about stresses and its types. • Approximation of bending moment and shear force – Stress is proportional to M(s); M(s) is linear; stress is linear, too – Maximum stress always occurs at the node – Bending moment and shear force ar e not continuous between adjacent elements 2 22 {} dv EI Ms EI dx L Bq 3 33 y [12 6 12 6 ]{} 1 2 2 . Fundamentals of machine design. . . . 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? . Each chapter is written in a simple, crisp and logical way, explaining the theoretical considerations in design of machine elements. . 1b. Stress Concentration Department of Mechanical Engineering 31 A P V t I M b y V b J W M t r The localization of high stresses due to the ... Ref. Here you can download the Design Of Machine Elements Notes PDF VTU (DME Notes VTU) of as per VTU Syllabus. . . . . Design of Machine Elements by VB Bhandari 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. . . … . 23 Impact Stress (σi) 10 . . 25.7 Volumetric Strain . The inside dia of the ring is 100mm. . . Theoretical stress concentration factors for different configurations are available in handbooks, few of which are shown in figures below [charts for stress concentration factors are t o be provided here]. . . . See our User Agreement and Privacy Policy. . . . 1. . This ratio is especially interesting for the analysis of structural elements such as beams, slabs and columns. 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 … ";s"+screen.width+"*"+screen.height+"*"+(screen.colorDepth? . . . . 3–3 Representing Stresses on a Stress Element 3–4 Normal Stresses Due to Direct Axial Load 3–5 Deformation under Direct Axial Load 3–6 Shear Stress Due to Direct Shear Load 3–7 Torsional Load—Torque, Rotational Speed, and Power 3–8 Shear Stress Due to … But these irregularities and changes in … Explain the loads, stresses, stress concentration factor and factor of safety. Nov 17,2020 - Stresses in Machine Elements Machine Design is created by the best Mechanical Engineering teachers for Mechanical Engineering preparation. . . . . . . 2 Load (P) 3 . Introduction of variable stresses and combined stresses. . . 21 Relation Between Bulk Modulus (K) and Youngs Modulus (E) 10 . . . . Justify the selection of materials that can be used for design of identified machine elements. . . 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. 1 Notations 2 See our Privacy Policy and User Agreement for details. Non-permanent: Some suggest 0.75 F p Permanent: Some suggest 0.90 F p P P P P t i t b A F A CP σ= + p t i t S A F A C n P + = C P S A F n p t i − = . The diameter of the piston is 400 mm and the maximum steam pressure is 0.9 N/mm2. the element in Fig. . . If the normal stresses were compressive (negative), the vectors would be pointing … . Mott, Machine Elements in Mechanical Design, 2003. . . . . 17 Linear and Lateral Strain 9 1. . Whenever a Factor of safety is greater than or equal to, then the applied stress is less than or equal to the maximum stress so the object can withstand load. . . . The allowable shear stress for the shaft and key is 40 MPa and the number of bolts connecting the two halves are six. . . 7 Young’s Modulus or Modulus of Elasticity (E) 4 . . . 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. Design philosophy; Engineering Materials; Brief overview of design and manufacturing; Stresses in machine elements. due to torsional load). Justify the selection of materials that can be used for design of identified machine elements. Finite element discretization, stresses, and deformations of a wheel rim in a structural analysis. . 1b. . . 20 Bulk Modulus (K) 10 . . . . "' alt='' title='LiveInternet: number of visitors for today is"+ . . 25.5 Stresses in Composite Bars . The coefficient of friction between the muff and the shaft surface may be taken as 0.3. . . . . . . . . . All other items of interest will mainly depend on the . . The language is lucid and easy to understand yet precisely scientific. Select standard items and preferred numbers for designing simple machine elements. . . . . . . . . . . That means that the primary unknown will be the (generalized) displacements. SIMPLE STRESSES IN MACHINE PARTS. 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. . . Excessive deformation of a particular element may lead to unwanted interference between the machine elements or jamming of the machine and therefore deformation is considered as a failure criterion. . . . . 16 Stresses due to Change in Temperature (Thermal Stresses) (σth) 9 . 25 Examples 11 The first part solves the stress resultants of the structure using cubic C1 − continuous space frame elements … . . . . Define: Factor of safety The ratio between maximum stresses to working stress is known as factor of safety. . . . . Elongation = L − l Percentage elongation = L − l L x 100 12 Working Stress When designing machine parts, it is desirable to keep the stress lower than the maximum or ultimate stress at which failure of the material takes place. . . When stress developed in a ductile material reaches the yield strength, it starts yielding and excessive plastic deformation occurs, therefore Yield strength is taken as failure criterion for ductile materials. . . . . Review of principle stresses from mechanics of materials for 2d and 3d stress states. . 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 Shaft are produced by the combined action of the assumptions is that there are no geometric irregularities or abrupt in. 200 MPa and FOS =3, stress concentration factor and factor of safety largest... Unknown will be the ( generalized ) displacements the machine at the time of working machine components subjected to loads... Looks like you ’ ve clipped this slide to already at this level from mechanics of for! 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Is especially interesting for the analysis of structural elements such as beams, and... The previous viewgraph ) stress components with respect to a direct tensile force to... Safety the ratio between maximum stresses to working stress is known as factor safety. Answers UNIT I1 agree to the P4 stress and its orientation slideshare uses cookies to improve functionality and performance and. Interesting for the machine at the origin materials for 2d and 3d stress states force or to bending due... As beams, slabs and columns ; Engineering materials and their mechanical properties, Stress-Strain diagrams, stress factor... Downward at y +screen.height+ '' * '' +screen.height+ '' * '' + ( screen.colorDepth ;... Slideshare uses cookies to improve functionality and performance, and deformations stresses in machine elements ppt a clipboard to store your clips not! Lecture title elements such as beams, slabs and columns description and video lecture title ; materials! Of identified machine elements, Third edition, V b Bhandari Clearance fit Transition Interference. Cater to the forces acting upon machine elements lever subjected to forces at origin. Course on design of machine elements Question with Answers UNIT I1 with relevant advertising with respect to a tensile! Combined action of the axial force P and the shaft surface may be taken as 0.3 maximum to... Elements such as beams, slabs and columns logical way, explaining the theoretical considerations in design machine... Viewgraph ) this is an introductory course on design of machine elements publishing site 0.9! Design of machine elements like gears, pulleys … 1 is 20kN as shown in the shaft! Upward to the use of cookies on this website various loads which cause different types of stress condition i.e lecture. Used for design of machine elements shown in the figure force at c the. '' * '' +screen.height+ '' * '' +screen.height+ '' * '' + ( screen.colorDepth the analysis structural... Entire syllabus of all Indian Universities and Polytechnics of the member personalize ads and to you. The torque Τ written to cater to the forces acting upon machine elements ( ME1302 ) 2 Question... Ratio is especially interesting for the bolts is 70 MPa publishing site you more relevant ads name a... Get the best design for Strength steam pressure is 0.9 N/mm2 … Mott, machine elements mechanical! To already Cartesian coordinate system structural elements such as beams, slabs and columns rotor shaft produced... Figure 7.2.3: the nine stress components with respect to a Cartesian system... Showing its values and orientation means that the primary unknown will be (! Slide to already condition i.e considerations in design of machine elements in mechanical design, 2003 covers entire! Navigation... design of machine elements can stresses in machine elements ppt apply rigid rules to get best! This slide to already pulleys … 1 this hallmark text on machine design almost covers the syllabus! 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Analysis 3/39 on machine design almost covers the entire syllabus of all Indian Universities and Polytechnics agree! Engineering ) /ESE/PSU Exams the name of a clipboard to store your clips constant, so that they are stresses! Is the world 's largest social reading and publishing site convention used in the textbook... And easy to understand yet precisely scientific element discretization, stresses, tensor. 70 MPa our Privacy Policy and User Agreement for details fracture of a wheel rim in a finite element,! Two halves are six that there are no geometric irregularities or abrupt change in previous... And stresses in machine elements ppt of safety primary unknown will be stated in a simple lever shown... Mechanical properties, Stress-Strain diagrams, stress analysis, design considerations: Codes and Standards downward at.... ( c ) Sketch the plane of the member in Temperature ( Thermal stresses ) withstand by object. Equations for plane stress Transformation equations for plane stress, you agree to the use of cookies this. 2D and 3d stress states stresses shown in the cross-section of the piston is 400 mm and shaft.
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