Error Reduction for the Determination of Transverse Moduli of Single-Strand Carbon Fibers via Atomic Force Microscopy

Abstract

The transverse modulus of single strand carbon fibers is measured using PeakForce Atomic Force Microscopy - Quantitative Nanomechanical Measurement to less than 5 percent error for 11 types of carbon fiber with longitudinal moduli between 924-231 GPA, including export-controlled fibers. Statistical methods are employed to improve the quality of data to exclude outliers within an measurement and within the sample set. A positive linear correlation between the longitudinal and transverse modulus with an R2=0.76 is found. Pitch-based fibers exhibit lower measurement error than PAN-based fibers, while PAN fibers exhibited no apparent modulus correlation when the Pitch fibers are excluded. Three alternative methods for calculating the transverse modulus using the raw instrument data were studied. Two methods approximated the indentation force curve, while the third performs a linear fit to the measured force curves.

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Document Details

Document Type
Technical Report
Publication Date
Mar 25, 2021
Accession Number
AD1146026

Entities

People

  • Joshua D. Frey

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Counter WMD
  • Energy and Power Technologies
  • Engineered Resilient Systems
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Carbon Carbon Composites
  • Carbon Fibers
  • Composite Materials
  • Compressive Strength
  • Data Analysis
  • Data Processing
  • Engineering
  • Fibers
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Measurement
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Microscopy
  • Modulus Of Elasticity

Fields of Study

  • Physics

Readers

  • Regression Analysis.
  • Reinforced Composite Materials