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Fatigue Testing of Transversely Loaded Aluminium Lugs.

N7823490

Publication Date	1977
Personal Author	Larsson, N.
Page Count	46
Abstract	A first sequence of fatigue testing with lugs of forged aluminum AZ 74 is reviewed. The testing comprised lugs of three types and loading in two directions. Lugs type A2 had its edge surfaces parallel. Type B and C had edge surfaces bevelling at angles 30, resp. 60 deg. The pin holes had 8 mm diameter. Loading directions were phi = 0 and phi = 90 deg to the principal direction of the lug. Loading was applied as alternating tension with phi(min) = 500 N, for lugs type A2 also phi(mean) = 0. The test results showed no marked difference in fatigue strength between the three types of lugs, when loaded at an angle phi = 0. At the angle phi = 90, type A2 had the lowest and type C the highest strength. Scatter was less for phi = 90 than for phi = 0. Observations of fretting and crack initiation are labelled. The investigation is continued with two more lug types (A1 and A3) and three more loading directions (phi = 30, 60, and 110).
Keywords	Lugs Aluminum Fatigue tests Loads (Forces) Crack initiation Forging S-n diagrams Static tests Stress-strain diagrams Transverse waves Aluminum alloy AZ 74 Sweden
Source Agency	NASA Foreign Exchange Program
NTIS Subject Category	97 - Energy 89D - Structural Analyses
Corporate Authors	Aeronautical Research Inst. of Sweden, Stockholm. Structures Dept.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	0

Fatigue Testing of Transversely Loaded Aluminium Lugs.

Fatigue Testing of Transversely Loaded Aluminium Lugs.
N7823490

Publication Date	1977
Personal Author	Larsson, N.
Page Count	46
Abstract	A first sequence of fatigue testing with lugs of forged aluminum AZ 74 is reviewed. The testing comprised lugs of three types and loading in two directions. Lugs type A2 had its edge surfaces parallel. Type B and C had edge surfaces bevelling at angles 30, resp. 60 deg. The pin holes had 8 mm diameter. Loading directions were phi = 0 and phi = 90 deg to the principal direction of the lug. Loading was applied as alternating tension with phi(min) = 500 N, for lugs type A2 also phi(mean) = 0. The test results showed no marked difference in fatigue strength between the three types of lugs, when loaded at an angle phi = 0. At the angle phi = 90, type A2 had the lowest and type C the highest strength. Scatter was less for phi = 90 than for phi = 0. Observations of fretting and crack initiation are labelled. The investigation is continued with two more lug types (A1 and A3) and three more loading directions (phi = 30, 60, and 110).
Keywords	Lugs Aluminum Fatigue tests Loads (Forces) Crack initiation Forging S-n diagrams Static tests Stress-strain diagrams Transverse waves Aluminum alloy AZ 74 Sweden
Source Agency	NASA Foreign Exchange Program
NTIS Subject Category	97 - Energy 89D - Structural Analyses
Corporate Authors	Aeronautical Research Inst. of Sweden, Stockholm. Structures Dept.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	0