Section 2. Stresses and Strain 2.1. Scarf joint 2.2. Stresses on plate edge 2.3. Stresses of I-section 2.4. Pressure vessel’s stresses 2.5. Pressure vessel’s strains 2.6. Design of pressure vessel 2.7. Strain gauges 2.8. Stiffness matrix 2.9. Laminated composite 2.10. Lattice grid 2.11. Spiral stirrups 2.12. Plate’s loads on the edge 2.13. Curved beam 2.14. Curved I-beam 2.15. Boussinesq formula 2.16. Infinite half space 2.17. Inclined load on a plate 2.18. Hole on plate