Experimental Evaluation of Dynamic Crack Branching in Poly(methyl methacrylate) (PMMA) Using the Method of Coherent Gradient Sensing

Abstract

We investigate the experimental setup and methods to evaluate the characteristics of dynamic crack branching in poly(methyl methacrylate) (PMMA). The method of coherent gradient sensing is used to determine crack tip location and crack mode mixity in samples dynamically loaded via a projectile from a gas gun. We study crack propagation velocities as a function of impact velocity and its effect on crack path and branching. We also note the effect of branching on crack velocity as one or more cracks move through a material.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2010
Accession Number
ADA518614

Entities

People

  • Pierce Umberger

Organizations

  • Oak Ridge Institute for Science and Education

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Acquisition
  • Alkenes
  • Cameras
  • Crack Propagation
  • Crack Tips
  • Data Acquisition
  • Education
  • Fracture (Mechanics)
  • Gas Guns
  • Guns
  • Images
  • Materials
  • Methacrylates
  • Military Research
  • Projectiles
  • Test And Evaluation
  • Waves

Readers

  • Mathematical Modeling and Probability Theory.
  • Nanofabrication and Microfabrication.
  • Structural Health Monitoring of Composite Structures.