Measurement of residual strains as a parameter of matrix cracking in cfrp laminates

M. J.Mohammad Fikry, Shinji Ogihara, Vladimir Vinogradov

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Matrix cracking in CFRP laminates results in degradation of mechanical properties of the material and appearance of residual strains. In this study, the residual strains investigated are experimentally and analytically for CFRP [0/756]s laminates. The strain gauges were used in this study to measure the strains. Due to very small residual strains at the unloading condition, the residual strains were also measured at different stress levels for laminates with different crack densities and are compared with theoretical predictions. Time-dependent viscoelastic behavior of the material is also considered to accurately measure the residual strains due to the occurrence of matrix cracks. This was done by using the strain recovery test when the loads were stopped for 1-1.5 hours during unloading and the strain changes during these times were recorded. The experimental results of the residual strains are in reasonably good agreement with the theoretical predictions. The fiber nonlinearity properties of the laminates may cause some experimental data to shift above the analytical line. Keywords: Residual strains, matrix crack, laminates, time-dependent behavior

Original languageEnglish
Title of host publicationJSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing, LEMP 2020
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791883624
DOIs
Publication statusPublished - 2020
EventJSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing, LEMP 2020 - Virtual, Online
Duration: 3 Sep 2020 → …

Publication series

NameJSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing, LEMP 2020

Conference

ConferenceJSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing, LEMP 2020
CityVirtual, Online
Period3/09/20 → …

Keywords

  • Laminates
  • Matrix crack
  • Residual strains
  • Time-dependent behavior

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