Static Uniaxial Strain Behavior of 15 Rocks to 30 KB

Abstract

Samples of 15 rocks with porosity ranging from nearly zero to 40 percent were deformed in uniaxial strain to stresses which reached 31 kb. The principal stress ratio and the volumetric strain were recorded for comparison with experiments done statically elsewhere and with results from shock loading. The stress-strain relations of low porosity rocks such as Westerly granite are nearly identical with those reported for shock loading. For material with porosity greater than about 2 percent, permanent compaction occurred at the stresses imposed here. Compaction was apparently time-dependent, for nearly twice as much compaction was observed in our static experiments as in shock loading. Macroscopic faulting was not observed. For rocks of low porosity the stress-strain relation in uniaxial strain loading is closely predictable from compressibility, suggesting that behavior of these rocks was elastic, or, at least, recoverable even to high stress levels.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1970
Accession Number
AD0717368

Entities

People

  • W. F. Brace

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Axial Loads
  • Compression
  • Compressive Properties
  • Determinants (Mathematics)
  • Elastic Properties
  • Gages
  • Hydrostatic Pressure
  • Materials
  • Measurement
  • Mechanics
  • Planetary Sciences
  • Porosity
  • Porous Materials
  • Strain Gages
  • Strain Rate
  • Stress Strain Relations
  • Stresses

Fields of Study

  • Geology

Readers

  • Mechanical Engineering/Mechanics of Materials.