The Effects of Net-Shape Machining on the Performance of Al 2024-T3 Subjected to Axial Tension-Tension Fatigue Loads

Abstract

Surface texture and process defects resulting from net-shape machining of engineering materials are often ignored in the design analysis of machined components parts. In this investigation, the effects of net-shape machining on the fatigue life of 2024-T6 aluminum were studied. Specimens were prepared using Abrasive Water Jet (AWJ) machining and the surface texture resulting from machining was characterized using contact profilometry. Based on the results from the surface texture evaluation and axial tension-tension fatigue tests performed, it was found that the fatigue life of 2024-T6 aluminum is surface texture dependent. As the roughness increases, the fatigue strength of the 2024-T6 aluminum decreases. It was found that the notch depth of the machined surface plays an important role in both low and high cycle fatigue. However, the mechanisms involved at low cycle fatigue are not well understood.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2010
Accession Number
ADA528052

Entities

People

  • Cyril L. Williams

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Human Systems
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Engineering
  • Failure Mode And Effect Analysis
  • Fatigue Life
  • Fatigue Tests (Mechanics)
  • Machining
  • Manufacturing
  • Materials
  • Mechanical Properties
  • Mechanics
  • Military Research
  • Notch Sensitivity
  • Reinforced Plastics
  • Roughness
  • Stress Concentration
  • Surface Properties
  • Surface Roughness
  • Test And Evaluation

Fields of Study

  • Materials science

Readers

  • Manufacturing Engineering.
  • Thin Film Deposition Science.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).