Concept Question Which of the following statements is true 1. The PVD and the PMPE are equivalent 2. The PVD is more general 3. The PMPE applies to any kind of material 4. The stationary character of the potential en ergy is equivalent to the Pvd for elastic ma terials

Unit #10- Principle of minimum potential energy and Castigliano's First Theorem Principle of minimum potential energy The principle of virtual displacements applies regardless of the constitutive law. Restrict attention to elastic materials(possibly nonlinear). Start from the Pvd

Which of the following expressions most ac curately and simply represents the comple mentary strain energy density Uc of a linear elastic material?

1. Deformation process of polycrystalline materials Deformation process of industrial material consists of three stages Elastic. which is reversible

§3-1 Work（功） §3-2 Kinetic Energy（动能）and The Law of Kinetic Energy（动能定理） §3-3 Conservative Force（保守力） & Potential Energy of Weight Elastic Potential Energy （弹性势能） Universal Gravitational Potential Energy §3-4 Conservation of Mechanical Energy（机械能） §3-5 The Conservation of Energy