A Bar Impact Tester for Dynamic Fracture Testing of Ceramics and Ceramic Composites

Abstract

A bar impact test was developed to study the dynamic fracture responses of precracked ceramic bars, Al2O3 and 15/29% volume SiCw/Al2O3. Laser interferometric displacement gage data was used together with dynamic finite element analysis to determine the instantaneous crack length and the dynamic stress intensity factor, K sub ID(t), in the fracturing ceramic bars impacted with impactor velocities of 5.8, 8.0, and 10 m/s. The crack velocities increased from 1400 to 2600 m/s with increasing impact velocity. K sub ID(t) initiated at the expected dynamic fracture toughness and increased with time and with increasing impact velocity. The dynamic initiation fracture toughness and an increasing K sub ID(t) with time and increasing impact velocity were obtained.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1991
Accession Number
ADA241782

Entities

People

  • Albert S. Kobayashi
  • L. R. Deobald

Organizations

  • University of Washington

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Ceramic Materials
  • Ceramic Matrix Composites
  • Composite Materials
  • Crack Tips
  • Displacement
  • Finite Element Analysis
  • Geometry
  • Impact Tests
  • Intensity
  • Materials
  • Materials Testing
  • Mechanical Properties
  • Mechanics
  • Stress Intensity Factors
  • Stress Waves
  • Stresses
  • Toughness

Readers

  • Integrated Circuit Design and Technology.
  • Materials Science (Mechanical Engineering).

Technology Areas

  • Directed Energy