Crack Growth Data Collection and Reduction Methodology Survey

Abstract

This methodology survey discusses crack growth data collection and reduction. Complications in the measurement process include inhomogeneity of microstructure, large deformations, and material nonuniformity complicate the analysis of cracks in propellant. Microstructure - void nucleation, growth, and coalescence at the crack tip causes sporadic crack growth. Large deformations - blunting at crack tip and large dimensional changes make measuring crack size somewhat subjective. Variation of specimen properties due to trouble maintaining uniformity during processing of large rocket grains also a problem. These complications give the crack growth rates scatter. Some of the scatter reflects real instantaneous changes in crack speed, while some are related to the measurement techniques used.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jan 30, 2001
Accession Number
ADA410451

Entities

People

  • Tim Miller

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Air Force Research Laboratories
  • Crack Tips
  • Cracks
  • Department Of Defense
  • Information Operations
  • Materials
  • Materials Laboratories
  • Materials Testing
  • Measurement
  • Microstructure
  • Military Research
  • Propellants
  • Rocket Propellant Grains
  • Test Methods

Readers

  • Instructional Design and Training Evaluation.
  • Materials Science (Mechanical Engineering).
  • Theoretical Analysis.