A Study on Surface Modification of Al7075-T6 Alloy against Fretting Fatigue Phenomenon

Table 1

The reduction coefficient of fretting fatigue life for some engineering alloys [26].

Fatigue specimen	Contact pad	Contact pressure (MPa)	Fatigue mean stress (MPa)	Fatigue strength unfretted (MPa)	Fatigue strength fretted (MPa)	Strength reduction factor	Relative slip range (𝜇m)
Steels
3.5NiCrMoV	1CrMo	30	0	±300	±140	2.1	15
3.5NiCrMoV	1CrMo	30	300	±215	±60	3.6	6.2
3.5NiCrMoV	1CrMo	300	0	±300	±130	2.3	12
3.5NiCrMoV	1CrMo	300	300	±215	±60	3.6	4
3.5NiCrMoV	2014 A	30	0	±300	±140	2.1	1.5
3.5NiCrMoV	2014 A	30	300	±215	±75	2.9	6.8
18M114Cr	3.5NiCrMoV	20.7	0	±250	±100	2.5	10
18M114Cr	3.5NiCrMoV	20.7	300	±125	±50	2.5	4.5
18M114Cr	3.5NiCrMoV	20.7	0	±250	±165	1.5	17.4
18M114Cr	3.5NiCIMoV	20.7	300	±185	±70	2.6	6.7
Aluminum
2014A Al	3.5NiCrMoV	30.8	75	±140	±15	9.3	2
2014A Al	3.5NiCrMoV	30.8	125	±135	±12.5	10.8	1.5
2014A Al	3.5NiCrMoV	30.8	125	±135	±50	2.7	9.6
Peened
Aluminum
2014A	BS S98	103.5	0	±148	±72	2.05	2
2014A	BS S98	103.5	0	±148	±47	3.14	4.2
2014A	BS S98	103.5	0	±148	±36	4.11	8.35
2014A	BS S98	103.5	0	±148	±36	4.11	17.4
Titanium
Ti6Al4V	Ti6Al4V	20	61.25	±260	±125	2.1	30