THE EFFECT OF INELASTIC TENSILE PRESTRAIN ON THE BRITTLE FRACTURE PROPERTIES OF ANNEALED 4140 STEEL.

Abstract

An experimental study is reported that determines the effect of increasing amounts of inelastic tensile prestrain on the brittle fracture behavior of annealed AISI 4140 steel. Fracture characteristics of both prestrained and unstrained material were measured with V-notch Charpy specimens and drop-weight specimens. Specimens were prestrained to 1.3, 2.7, and 7.8 percent inelastic strains. Significant changes were observed in the slope, upper energy shelf and temperature location of the Charpy energy-temperature curve. The nil-ductility transition temperature (NDT), NDT energy 'fix,' and the Charpy fracture appearance curve also were affected markedly by inelastic prestrain. An introductory review of brittle fracture is presented. Emphasis is given to the transition temperature method of fracture analysis and to the design approach embodied in the Fracture Analysis Diagram developed at the U. S. Naval Research Laboratory. The design significance of the experimental data in interpreted in terms of their effect on the Fracture Analysis Diagram. (Author)

Document Details

Document Type
Technical Report
Publication Date
May 06, 1965
Accession Number
AD0467523

Entities

People

  • D. W. Mclaughlin

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Buildings And Structures
  • Ductile Brittle Transition
  • Ductility
  • Experimental Data
  • Laboratory Procedures
  • Materials
  • Military Research
  • Research Facilities
  • Transition Temperature
  • Transitions

Readers

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