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5. What do you mean under the terms: beam, shell, plate, array?
6. Formulate the hypotheses about the properties of the material
used in the calculation model.
7. What types of fixing support do you know?
8. How can you classify the load?
9. Which types of distributed loads do you know?
10. What is the concentrated force and concentrated moment?
11. What is the principle of superposition?
12. Describe the principle of Saint-Wenan.
13. What is the internal elastic force?
14. List the internal force factors.
15. What is the method of sections?
16. Give the definition of stress.
17. Express the internal force factors in stress.
18. What is the hypothesis of plane sections?

2 CENTRAL TENSION - COMPRESSION

2.1 Longitudinal force

The central tension - compression is called such a type of
deformation when in the cross-sections of the rod there is only one
internal force factor – longitudinal force N .
x

Figure 2.1

While stretching the longitudinal force is considered to be
positive and the compressive - negative (fig.2.1).
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