Fatigue—determination of a more realistic usage factor

Performance study of Ke factors in simplified elastic plastic fatigue analyses with emphasis on thermal cyclic loading

“…The pseudo elastic stress amplitude S a is calculated as follows: The event combinations S p;k ¼ S p;k;i À S p;k;j k ¼ x; y; z; xy; yz; xz (4) are used for the determination of the elastic equivalent stress range S p according to the Tresca or the von Mises criterion. The linearized stress range S n is calculated analogously from the component stress ranges.…”

“…This approach will obviously fail in the presence of stress raisers like notches. As a consequence, the most highly stressed locations may be incorrectly identified leading to errors in inspection and monitoring schemes [4]. One possible solution is the application of approved more realistic K e factors in accordance with the design code [3].…”

Modelling and simulation of the fatigue usage factor of γ-TiAl alloy fabricated through Laser Additive Manufacturing (LAM)

“…Therefore, the search for the critical plane can be 50 reduced to two dimensions. In that case, the normal and shear stresses on a plane can be obtained 51 as stated in equation ( 6) and equation (7), respectively. where, ∆ε el.pl.…”

AREVA Fatigue Concept - A Three Stage Approach to the Fatigue Assessment of Power Plant Components

“…The Hysteresis Counting Method (HCM) according to Clormann and Seeger [10] is applied for this purpose. Additionally, the introduction of so called basic events allows a more realistic consideration of the load time sequence [13].…”