EFFECT OF FATIGUE LOADING ON UNHEALED POROSITY VOID GROWTH

Test specimens taken from 7075-T6 aluminum alloy forgings were chosen with voids (unhealed poro sity) situated at the surface and center of test sections and fatigue tested at 20,000 psi gross stress in axial tension at a stress ratio of 0.05. Ultragraph recordings of void size were made throughout...

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Bibliographic Details
Main Authors: Love, D H, Lindeneau, G D, Wise, W E
Format: Report
Language:English
Subjects:
ALUMINUM ALLOY 7075-T6
ALUMINUM ALLOYS
FATIGUE
FORGING
GASES
MAGNESIUM ALLOYS
POROSITY
Properties of Metals and Alloys
ULTRASONIC RADIATION
VOIDS
ZINC
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Summary:Test specimens taken from 7075-T6 aluminum alloy forgings were chosen with voids (unhealed poro sity) situated at the surface and center of test sections and fatigue tested at 20,000 psi gross stress in axial tension at a stress ratio of 0.05. Ultragraph recordings of void size were made throughout to note growth as fatigue stressing progressed. The test observations indicated that internal voids which did not emerge to specimen surfaces exerted little or no effect on fatigue life; however, those voids which appeared at specimen surfaces caused appreciable reductions in fatigue life. Report on Material, Aluminum, 7075 T6.