OABCDO BCD OABDO The area corresponds to strain energy stored in the structure. Energy of structure is its capacity of doing work and strain energy is the internal energy in the structure because of its deformation. The Ritz Method. It is usually denoted by U. The expression of strain energy depends therefore on the internal forces that can develop in the member due to applied external forces. The equations are written below for convenience. The area represents the inelastic portion of strain energy. ij corresponding to the increment of strain is obtained from the elasticity law ˙ ij= C ijkl kl (8.14a) ˙ ij= C ijkl kl (8.14b) Therefore, by eliminating C ijkl ˙ ij ij= ij ˙ ij (8.15) The total strain energy of the elastic system is the sum of the elastic strain energy stored and the work … How to draw Stress-strain diagram & why ? The strain energy per unit volume is known as strain energy density and the area under the stress-strain curve towards the point of deformation. P~ and Varying Lesson 89 of 100 • 32 upvotes • 12:44 mins, Castigliano's Theorems - Strain energy method for the calculation of slope and deflection, Overview of Strength of Materials (in Hindi), Basics of SOM- assumptions, isotropic and homogeneous Material and Different types of loads, Loads- Axial load (AL), Eccentric AL, Transverse Shear Load (TSL), Eccentric TSL, Bending & Twisting, Different Types of Load -Bending moment and Twisting Moment: Part 2 (in Hindi), Identify the Different Types of Loads Through Examples (in Hindi), Load acting on any cross-section of the member by method of section, Sign convention for the loading on the cross-section of the member, Introduction of Pure Bending and Bending equation, Combination of Pure Axial Loading and Pure Bending i.e. Principle of (Real) work and (Real) energy (for conservative systems) Real external work done = Real internal energy stored => only 1 unknown displacement/rotation can be solved for 1 applied force/moment. Sep 03, 2020 - Strain Energy Method Notes | EduRev is made by best teachers of . Complementary strain energy U* (expressed in terms of force). Finding the partial derivative of this expression will give us the equations of Castigliano’s deflection and rotation of beams. This document is highly rated by students and has been viewed 275 times. The Ritz Method Cont. Italian engineer Alberto Castigliano (1847 – 1884) developed a method of determining deflection of structures by strain energy method. 1. When the applied force is released, the whole system returns to its original shape. ot . Description of the Method. 16 Strain Energy Methods CHAPTER OBJECTIVES The strain energy methods are most commonly used for solving the unknown factors in complicated structural problems. loads on the cross-section & understanding of stress developed in the bar & on x-s/c of bar, Numerical problems on Previously covered topics, Stress,Uni-axial state of stress,tri-axial state of strain, Hooke's Law. 16. If the effect of force is to distort an elastic body (such as a linear spring), work done by f id stored as strain energy U (expressed in terms of displacement). In this chapter, students will learn about: … - Selection from Strength of Materials [Book] His Theorem of the Derivatives of Internal Work of Deformation extended its application to the calculation of relative rotations and displacements between points in the structure and to the study of beams in flexure. Italian engineer Alberto Castigliano (1847 – 1884) developed a method of determining deflection of structures by strain energy method. of E & G, Bulk modulus (K) , & Expression for volumetric strain under tri-axial loading, Numerical problems on Volumetric strain & Elastic constant, Analysis of Pure axial loading on Stepped bar ( Bar in series), Case 2 - Analysis of Axial loading on Stepped bar ( Bar in series), Numerical problems on stepped bar & Analysis of Bar fixed at both end (Statically Indeterminate Bar), Numerical problems on Bar fixed at both end ( Statically Indeterminate Bar) & Shortcut for reactions, Important Numerical problems on Statically Indeterminate Bar & Shortcut for reactions, More Important Numerical problems on Statically Indeterminate Bar, Analysis of Axial load on Tapered bar & Calculate maximum stress induced & elongation of tapered bar, Analysis of Tapered bar fixed at both ends (Statically Indeterminate Tapered bar), Elongation of Prismatic bar due to its self weight & Numerical problems, Elongation of Conical bar due to its self weight & Question- when both self weight & Axial load, Comparison among Prismatic bar under Axial loading , Prismatic & Conical bar due to its self weight, Strain Energy, Resilience,& Toughness, Proof Resilience, Modulus of Resilience, Modulus of Toughness, Calculate Strain Energy under Axial loading,under bending,under twisting, Numerical problems for the calculation of Strain Energy, Strain Energy of a rectangular block under a shear load, Strain Energy of a beam under pure Bending, Numerical problems of Strain Energy of a cantilever beam & simply Supported beam & draw SFD,BMD, Strain energy of Prismatic shaft & Stepped shaft under Pure Torsion, Bars in Parallel / Composite bar (Statically Indeterminate bar) under axial loading & Numerical prob, Understanding of Thermal Stress,Thermal stress during free expansion & completely restricted, Thermal stress during completely or Partially restricted expansion/ Compression & Numerical problem, Analysis of Thermal Stresses in Compound bar (Bars in series), Numerical problems on Thermal Stresses in Compound bar (bars in series) & Important points, Analysis of Thermal Stresses in Composite bar (bars in Parallel), Numerical problems for the calculation of Thermal Stresses in Composite bar (bars in Parallel), Important numerical problems for the calculation of Thermal Stress, Beam,Beam classification, Types of Rigid supports, Types of Loads acting on Beams, Calculation of Loads, Determine Support reactions acting on beam, Numerical problems for the calculation of Support reactions acting on beam, Important points to draw SFD & BMD and Sign convention, Numerical problems on SFD(Shear force diagram) and BMD (Bending moment diagram), Numerical problems on SFD and BMD & location of point of contraflexture, Numerical problems on SFD & BMD, location of contraflexture point, radius of curvature, Draw SFD & BMD for uniform distributed load, uniformly varying load, Draw SFD & BMD for uniformly varying load, Draw SFD and BMD for double uniformly varying load & Numerical problems, Important Numerical problems on SFD and BMD, Numerical problems on SFD and BMD, Relationship b/w load intensity,Shear force and bending moment, GATE previous year problems on SFD and BMD, GATE Previous year problems on SFD AND BMD, GATE problems on SFD and BMD & Important points related to bending stress, Deflection of beams-Objective, Basic understanding, Location of maximum slope & maximum deflection & Double Integration method’s procedure, Double Integration method – Calculate maximum slope and maximum deflection, Remember important values of Max slope & max Deflection for various beams under different loading, Important problems for the calculation of maximum slope, maximum deflection , location and support, Numerical problems on deflection of beams, More Problems for the calculation of maximum slope and maximum deflection, Important problems of Deflection of beams, Moment Area Method for the calculation of deflection and slope, Problems -Use Moment area method for the calculation of deflection and slope, Calculate slope and deflection by using moment area method, Important problems for the calculation of slope, deflection and reactions using moment area method, Castigliano's Theorems- Strain energy method for the calculation of slope and deflection, Problems for the calculation of deflection and slope using Castigliano's Theorems, More Problems for the calculation of slope and deflection using Castigliano's Theorem, Solve these important problems using Castigliano's Theorems, Maxwell's Reciprocal Theorem for the calculation of deflection and solve Some Problems, Most important problems of Deflection of beams, Analysis of Thin Cylinder (Thin Pressure Vessels), Analysis of Thin Cylinder & thin spheres -part 2, Exp. By the principle of conservation of energy. Approximate Methods . One Dimensional Examples. In this chapter, students will learn about: Castigliano’s theorem for determination of displacement, angular rotation and angular twist by the partial derivatives of the strain energy absorbed by the body during deformation caused by external loads, moments etc. His Theorem of the Derivatives of Internal Work of Deformation extended its application to the calculation of relative rotations and displacements between points in the structure and to the study of beams in flexure. The external work done on such a member when it is deformed from its unstressed state, is transformed into (and considered equal to) the strain energy stored in it.