This text treats solids and fluids in a balanced manner, using thermodynamic restrictions on the relation between applied forces and material responses.This text treats solids and fluids in a balanced manner, using thermodynamic restrictions on the relation between applied forces and material responses. It has many examples and about 150 exercises. The higher mathematics needed for a complete understanding is in the early chapters. This subject is essential for experimental or numerical modeling of material behavior.This text treats solids and fluids in a balanced manner, using thermodynamic restrictions on the relation between applied forces and material responses. It has many examples and about 150 exercises. The higher mathematics needed for a complete understanding is in the early chapters. This subject is essential for experimental or numerical modeling of material behavior.This textbook treats solids and fluids in a balanced manner, using thermodynamic restrictions on the relation between applied forces and material responses. This unified approach can be appreciated by engineers, physicists, and applied mathematicians with some background in engineering mechanics. It has many examples and about 150 exercises for students to practice. The higher mathematics needed for a complete understanding is provided in the early chapters. This subject is essential for engineers involved in experimental or numerical modeling of material behavior.1. Introduction; 2. Cartesian tensors; 3. General tensors; 4. Integral theorems; 5. Deformation; 6. Motion; 7. Fundamental laws of mechanics; 8. Stress tensor; 9. Energy and entropy constraints; 10. Constitutive relations; 11. Hyperelastic materials; 12. Fluid dynamics; 13. Viscoelasticity; 14. Plasticity.