Chapter 10 The Energy Principles and the variational calculus 8 10-1 The Specific Energy of Deformation and Strain Energy 0 of Elastic body 8 10-2 The Variational Equation of Displacement and The Principle of minimum Potential Energy 8 10-3 The Variational Method of Displacement 810-4 The Variational Equations of Stress and the Variational Method of stress3 §10-1 The Specific Energy of Deformation and Strain Energy of Elastic Body §10-3 The Variational Method of Displacement §10-4 The Variational Equations of Stress and the Variational Method of Stress §10-2 The Variational Equation of Displacement and The Principle of Minimum Potential Energy Chapter 10 The Energy Principles and theVariational Calculus