Research on the Creep and Fatigue Evaluation Method of the Double-Layered Annulus Metal Hydride Bed Combined with Numerical Modeling and ASME Code

Table 4

Evaluation procedure of the cumulative usage factor.

Fatigue event	Service conditions: Heating and cooling process
	Design cycles: 10,000 cycles
The selected location for fatigue evaluation	Two locations are selected where the maximum stress occurs
Design fatigue curve	Fig. I-9-2.2: ASME sec. III, div. 1, appendix I
	P + Q stress intensity range = 239.09 MPa
Fatigue evaluation	Alternating stress intensity = 165.47 MPa
	Allowable number: 169560 cycles
	Cumulative usage factor = 0.059