THE EFFECT OF SPECIMEN SIZE ON THE FATIGUE CRACK STRENGTH OF CYLINDRICAL SPECIMENS OF HEATTREATED 4340 STEEL.

Abstract

The present series of tests for a one-inch-diameter fatigue-notched specimen constitutes an extension of a previous series of tests for a onehalf-inch-diameter specimen. The principal change introduced is the specimen size. This change in specimen size leads to minor variations in the fatigue-notch tensile-strength data, but for certain material conditions and specimen-size ranges the notch strength can be profoundly altered. The ductile-brittle transition indicated is critically dependent on tensile strength. During the present tests load-elongation curves were taken, and these have allowed the examination of the ductile-brittle transition as established by stress, by strain, and by means of energy absorption. The experiments suggest that the stress-strain relations in certain fracture tests correspond to those measured for the notch tensile test. (Author)

Document Details

Document Type
Technical Report
Publication Date
Dec 16, 1963
Accession Number
AD0428226

Entities

People

  • E. P. Klier

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Absorption
  • Diameters
  • Ductile Brittle Transition
  • Elongation
  • Materials
  • Mechanical Properties
  • Physical Properties
  • Stress Strain Relations
  • Stresses
  • Tensile Strength
  • Transitions

Readers

  • Materials Science (Mechanical Engineering).
  • Mechanical Engineering/Mechanics of Materials.