Page 65 - 4560

10. What is the coefficient of summary length and what
determines its value?
11. How do you calculate the erection coefficient for a
specific length of the rod?
12. What is the limit of applicability of Euler’s formula?
13. What is the limiting flexibility?
14. How do you determine the critical force of Yasinsky’s
theory?
15. What view has the graphical dependence of the critical
stresses and flexibility for steel rods?
16. How do you classify rods according to their
flexibility?
17. Describe the condition of stability of compressed rod?
18. What is permissible stress reduction factor?
19. What sequence of verification is for the stability of
compressed rod?
20. What sequence of size matching of the rod cross-
section in the calculation of the stability?

6 CALCULATIONS FOR STRENGTH AT
STRESSES, WHICH CHANGE OVER TIME

6.1 The concept of fatigue

If the design element is effected with the load that changes for the
module and direction much over time, the nature of the resistance of
the material is significantly different from the resistance against the

65