tailieunhanh - Lecture Mechanics of materials (Third edition) - Chapter 6: Shearing stresses in beams and thinwalled members

The following will be discussed in this chapter: Introduction, shear on the horizontal face of a beam element, determination of the shearing stress, longitudinal shear on a beam element of arbitrary shape, shearing stresses in thin-walled members, unsymmetric loading of thin-walled members. | Third Edition CHAPTER MECHANICS OF MATERIALS Ferdinand P. Beer E. Russell Johnston, Jr. John T. DeWolf Lecture Notes: J. Walt Oler Texas Tech University Shearing Stresses in Beams and ThinWalled Members © 2002 The McGraw-Hill Companies, Inc. All rights reserved. Third Edition MECHANICS OF MATERIALS Beer • Johnston • DeWolf Shearing Stresses in Beams and Thin-Walled Members Introduction Shear on the Horizontal Face of a Beam Element Example Determination of the Shearing Stress in a Beam Shearing Stresses τxy in Common Types of Beams Further Discussion of the Distribution of Stresses in a . Sample Problem Longitudinal Shear on a Beam Element of Arbitrary Shape Example Shearing Stresses in Thin-Walled Members Plastic Deformations Sample Problem Unsymmetric Loading of Thin-Walled Members Example Example © 2002 The McGraw-Hill Companies, Inc. All rights reserved. 6-2 Third Edition MECHANICS OF MATERIALS Beer • Johnston • DeWolf Introduction • Transverse loading applied to a beam results in normal and shearing stresses in transverse sections. • Distribution of normal and shearing stresses satisfies Fx = ∫ σ x dA = 0 Fy = ∫ τ xy dA = −V Fz = ∫ τ xz dA = 0 ( ) M x = ∫ y τ xz − z τ xy dA = 0 M y = ∫ z σ x dA = 0 M z = ∫ (− y σ x ) = 0 • When shearing stresses are exerted on the vertical faces of an element, equal stresses must be exerted on the horizontal faces • Longitudinal shearing stresses must exist in any member subjected to transverse loading. © 2002 The McGraw-Hill Companies, Inc. All rights reserved. 6-3 Third Edition MECHANICS OF MATERIALS Beer • Johnston • DeWolf Shear on the Horizontal Face of a Beam Element • Consider prismatic beam • For equilibrium of beam element ∑ Fx = 0 = ∆H + ∫ (σ D − σ D )dA A ∆H = M D − MC ∫ y dA I A • Note, Q = ∫ y dA A M D − MC = dM ∆x = V ∆x dx • Substituting, VQ ∆x I ∆H VQ q= = = shear flow ∆x I ∆H = © 2002 The McGraw-Hill Companies, Inc. All rights .

• Kiến trúc - Xây dựng
• Mechanics of materials
• Cơ học vật liệu
• Lecture Mechanics of materials
• Shearing stresses in beams
• Thinwalled members
• Beam element
• Composite materials
• Mechanics of composite materials
• Mechanics of composite materials with MATLAB
• Effective elastic constants
• Homogenization of composite materials
• Introduction to damage mechanics
• Mechanical properties of materials
• Material impact on deformation
• Rectangular cross section
• Elastic and plastic regions
• Tension test
• Material constants
• Modulus of elasticity
• Logic in structural analysis
• Mechanics materials
• Recycling fiber reinforced composites
• Macromechanical analysis of a lamina
• Fracture mechanics
• mechanics
• racks in materials
• analytical solid mechanics
• modern materials science
• macroscopic mechanical
• Structure free body diagram
• Component free body diagram
• Method of joints
• Axial loading
• Normal strain
• Stress strain test
• Torsional loads
• Axial shear components
• Shaft deformations
• Pure bending
• Symmetric member
• Bending deformations
• Beams for bending
• Bending moment diagrams
• Bending moment
• Transformations of stress
• Transformation of plane stress
• Maximum shearing stress
• Principle stresses
• Transmission shaft
• Stresses under combined loadings
• Deflection of beams
• Elastic curve
• Statically indeterminate beams
• Stability of structures
• Pin ended beams
• Eccentric loading
• Energy methods
• Strain energy
• Strain energy density
• Torsion of Shafts
• Internal Torque
• Homogeneous cross section
• Concept of stress
• Stress on a surface
• Tensile stress
• Contructions of stress element
• Stress components
• Concept of strain
• Lagrangian strain
• Eulerian strain
• Preliminary definitions
• Average normal strain
• Average shear strain
• Axial members
• Prelude to theory
• Internal axial force
• Strain distribution
• Material model
• Axial formulas
• Theory for circular shafts
• Torsion formulas
• Circular cross section