The Effect of First Reflections in the Dynamic Tear Test

Abstract

The dynamic tear (DT) test if often used to study dynamic fracture. Previous work has indicated that the first impact waves arriving at the specimen notch may not create a stress severe enough for fracture. In this article, a finite element program for the exact dynamic simulation of an actual DT test is first compared with an analytical solution for the time interval prior to reflected wave appearance. The finite element results are then used to study the exact stress field near the specimen notch. This study demonstrated that is the arrival of the first reflected waves at the notch which generate the stress field necessary for fracture. These results are then used to estimate a critical dynamic stress intensity factor value for the DT test. Keywords: Dynamic fracture. Finite element, Stress waves, Dynamic tear test, Elastic response, Dynamics.

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Document Details

Document Type
Technical Report
Publication Date
Sep 08, 1988
Accession Number
ADA199538

Entities

People

  • L. M. Brock
  • M. I. Jolles
  • Virginia M. Gensheimer

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Applied Mechanics
  • Availability
  • Crack Tips
  • Cracks
  • Elastic Waves
  • Engineering
  • Fracture (Mechanics)
  • Impact Loads
  • Materials
  • Materials Science
  • Mechanics
  • Military Research
  • Physics Laboratories
  • Stress Intensity Factors
  • Stress Waves
  • Wave Propagation
  • Waves

Fields of Study

  • Engineering

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Materials Science (Mechanical Engineering).
  • Structural Dynamics.