The equations for fatigue potential energy and the lethargy coefficient are
derived from the dynamic fatigue life equation, while the static fatigue equation is
used in the tensile test for a damage accumulation process during high-cycle fatigue are...
The equations for fatigue potential energy and the lethargy coefficient are
derived from the dynamic fatigue life equation, while the static fatigue equation is
used in the tensile test for a damage accumulation process during high-cycle fatigue are investigated according to plastic-strain hardening, crack formation, crack propagation and fracture. It is shown that the fatigue test resembles the ten- sile test. The logarithm of the number of cycles-to-failure is proportional to the elongation in the tensile test, which emerges from the resemblance of the two
tests.
The toughness which is one of mechanical properties and the fatigue life relia- bilities are researched in this paper. The toughness of normal and welded materials from results of tensile test is investigated. The toughness of materials is reduced during welding process. This paper is shown that is a close connection between total toughness variance and partial toughness variance before tensile strength.