Spall Criteria for Several Metals

Abstract

Existing dynamic data are reviewed and new data are reported for spall type fracture in several metals. Fracture in OFHC copper was observed to be time dependent. Over driven spall in 1020 steel is better described by a time-independent spall stress of -45 kbar, and plastic strain of 0.03. However, experiments with conical targets indicated that this model is not entirely adequate for non 1-D strain states. Spall failure is 4340 RC30 steel did not appear to be rate dependent. The spall stress was -55 kbar. Spall in armor plate occurred at -60 kbar. In nickel 200, void coalescence was very gradual. Spall plate separation was virtually impossible in 1100 aluminum. The threshold stress for void formation was about -7 kbar.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1981
Accession Number
ADA112445

Entities

People

  • Stephan Bless

Organizations

  • University of Dayton

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Elastic Properties
  • Elastic Waves
  • Geometry
  • Gruneisen Parameter
  • Hardening
  • Hardness
  • Literature Surveys
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Phase Transformations
  • Residual Stress
  • Stresses
  • Tensile Strength
  • Two Dimensional
  • Yield Strength

Readers

  • Materials Science (Mechanical Engineering).
  • Metallurgy
  • Pavement Materials Engineering.