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0542-4224

Mechanics of solids 2

Also listed as: מכניקת המוצקים 2

The bridge from strength of materials to failure analysis. Yield criteria, unsymmetric bending, thin-walled torsion, energy methods, buckling. It counts toward three interest areas at once.

Semester
Semester B
Weekly hours
4h
Counts as
Core: solids
Interest areas
Structures and computational mechanics · Aeronautics and space · Miniaturised systems and materials

What it covers

Stress state and failure

  • Three-dimensional stress and strain, transformation, principal values, octahedral stresses
  • Generalised Hooke's law, strain energy and strain-energy density
  • Yield and failure criteria: Tresca, von Mises, Rankine, Mohr–Coulomb

Beams, torsion and energy methods

  • Unsymmetric bending, shear centre, curved beams, composite sections
  • Torsion of non-circular and thin-walled sections, open against closed, shear flow
  • Castigliano's theorems, unit-load and virtual-work methods
  • Statically indeterminate structures

Special problems and stability

  • Beams on elastic foundation
  • Thick-walled pressure vessels and rotating disks
  • Stress concentration
  • Euler columns, beam-columns, buckling and stability
  • Introduction to fatigue, fracture, anisotropy and composites

Results worth carrying out

  • von Mises stress

    σv=12[(σ1σ2)2+(σ2σ3)2+(σ3σ1)2]\sigma_v = \sqrt{\tfrac{1}{2}\left[(\sigma_1-\sigma_2)^2 + (\sigma_2-\sigma_3)^2 + (\sigma_3-\sigma_1)^2\right]}
  • Castigliano's second theorem

    δ=UP\delta = \frac{\partial U}{\partial P}
  • Euler buckling

    Pcr=π2EILe2P_{cr} = \frac{\pi^2 EI}{L_e^{\,2}}
  • Thin-walled torsion, shear flow

    q=T2Amq = \frac{T}{2A_m}

Figures worth knowing

  • Mohr's circle
  • von Mises and Tresca yield surfaces in principal-stress space
  • Shear-flow diagrams
  • Column buckling curves
  • Shear-centre sketches

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