30. Castigliano’s First Theorem
The chapter discusses energy methods in solid mechanics, specifically focusing on Castigliano’s First Theorem which relates energy stored in deformed bodies to generalized forces. Different forms of energy stored in beams due to axial extension, bending, torsion, and shear loads are derived systematically. Verification of reciprocal relations is provided, along with practical examples illustrating these concepts in solving problems related to beams under various loading conditions.
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4Example 1
What we have learnt
- Energy in deformable bodies can be expressed in terms of applied forces and displacements.
- Castigliano's First Theorem allows determination of displacements using the total energy of the system.
- Different deformation modes (bending, axial extension, torsion, and shear) have distinct expressions for the energy stored in beams.
Key Concepts
- -- Energy Method
- A technique in solid mechanics that relates the work done by external forces to the stored energy within a structure.
- -- Castigliano's First Theorem
- A principle stating that the displacement in a structure due to a generalized load is equal to the derivative of the total strain energy with respect to that load.
- -- Bending Energy
- The energy stored in a beam due to bending, which can be calculated from the bending moment and curvature.
- -- Shear Energy
- The energy due to shear deformations in a material when subjected to lateral loads.
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