TY - JOUR
T1 - The effect of electroless Ni-P coatings on the fatigue life of Al 7075-T6 fastener holes with symmetrical slits
AU - Rahmat, Mohamed
AU - Oskouei, Reza
AU - Ibrahim, Raafat
AU - Singh, Raman
PY - 2013
Y1 - 2013
N2 - In this paper, the fatigue behaviour of Al 7075-T6 fastener holes with symmetrical through slits was studied. The holes were coated with electroless nickel (EN) plating with a high phosphorous content of 10-13 wt% and a thickness of 40 μm. Uncoated open-hole, EN coated open-hole, uncoated bolted hole and EN coated bolted hole specimens were fatigue tested. Bolted samples were clamped with a high tightening torque of 7 Nm. The established S-N curves showed 282-1348% improvements in the fatigue life due to the combined effect of EN coating and bolt clamping, depending on the level of maximum alternating stress. Excellent adhesion was observed between the coating and the aluminium substrate along the crack path. Tensile tests results showed a considerable reduction of 54% in the ductility of the coated material while both the yield and ultimate strengths were found to slightly increase by approximately 6% in comparison with the uncoated aluminium alloy.
AB - In this paper, the fatigue behaviour of Al 7075-T6 fastener holes with symmetrical through slits was studied. The holes were coated with electroless nickel (EN) plating with a high phosphorous content of 10-13 wt% and a thickness of 40 μm. Uncoated open-hole, EN coated open-hole, uncoated bolted hole and EN coated bolted hole specimens were fatigue tested. Bolted samples were clamped with a high tightening torque of 7 Nm. The established S-N curves showed 282-1348% improvements in the fatigue life due to the combined effect of EN coating and bolt clamping, depending on the level of maximum alternating stress. Excellent adhesion was observed between the coating and the aluminium substrate along the crack path. Tensile tests results showed a considerable reduction of 54% in the ductility of the coated material while both the yield and ultimate strengths were found to slightly increase by approximately 6% in comparison with the uncoated aluminium alloy.
KW - Electroless nickel plating
KW - Fastener holes
KW - Fatigue
UR - http://www.scopus.com/inward/record.url?scp=84875692427&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2013.02.007
DO - 10.1016/j.ijfatigue.2013.02.007
M3 - Article
VL - 52
SP - 30
EP - 38
JO - International Journal of Fatigue
JF - International Journal of Fatigue
SN - 0142-1123
ER -