Effects of High Rate Shear on the Microstructure and Deformation and Fracture Behavior of Two High Strength Steels

Abstract

The shear localization behavior of two high strength stee ls was evaluated at loading rates ranging from quasi-static to impact. The steels evaluated were similar in yield strength, but had different levels of toughness. The steel with superior toughness was direct quenched (DQ). The second steel was quenched and tempered (Q&T). Fatigue precracked Dual Notched Shear (DNS) specimens, loaded in mode II (in-plane shear), were employed. The objectives were to measure energy density variations with loading rate, estimate the temperatures achieved in the shear zones of the specimens and examine micromechanisms of localized shear deformation as related to the microstructures of the steels. Temperatures in the shear zones were estimated from energy absorption characteristics and compared with temperatures measured adjacent to the fatigue crack tips, to assess compliance with adiabatic conditions. Keywords: High strength steels; Dynamic loading; Fracture; Shear; Micromechanisms of fracture; Shear banding; Ship materials; Metallurgy.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1989
Accession Number
ADA214107

Entities

People

  • E. M. Hackett

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemistry
  • Computational Fluid Dynamics
  • Crystal Structure
  • Engineering
  • Materials
  • Materials Engineering
  • Materials Science
  • Materials Testing
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Phase Transformations
  • Physics Laboratories
  • Stress Strain Relations
  • Tensile Strength
  • Test And Evaluation
  • Yield Strength

Fields of Study

  • Materials science

Readers

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