New Nonlinear Cumulative Fatigue Damage Model Based on Ecological Quality Dissipation of Materials

Table 2

Experimentally obtained and corresponding theoretical remaining life values predicted by the Miner, Kwofie, and proposed new model for the Ti-6Al-4V titanium alloy under two-level cyclic loading.

Load sequence	Test data			Miner model	Kwofie model	New model
(MPa)	(cycle)		(cycle)	(cycle)	(cycle)	(cycle)
647–517 (H–L)	10000	0.27	43000	104852	92924	31012
	12000	0.32	77900	97670	86559	28123
	18000	0.48	35700	74689	66192	20418
	20000	0.54	25500	66071	58555	17878
	36000	0.97	5400	4308	3818	1174
595–517 (H–L)	20000	0.31	27400	99106	92421	46879
	20000	0.31	49400	99106	92421	46879
	30000	0.47	26900	76125	70990	34170
	40000	0.62	22300	54580	50898	23977
	40000	0.62	17900	54580	50898	23977
	50000	0.78	5800	31599	29468	13817
517–647 (L–H)	30000	0.21	34800	29388	33160	37195
	60000	0.42	26900	21576	24346	37036
	80000	0.57	30600	15996	18049	36119
517–595 (L–H)	30000	0.21	63800	50928	54613	63996
	30000	0.21	51600	50928	54613	63996
	45000	0.31	56600	44482	47700	63005
	60000	0.42	44700	37390	40096	60614
	75000	0.52	46000	30944	33183	56455
	90000	0.62	24800	24497	26270	49533