Characterization of deformation localization mechanisms in polymer matrix composites: A digital image correlation study

Jay Patel, Pedro Peralta

Research output: Contribution to journalArticle

Abstract

Polymer matrix composites (PMCs) are attractive structural materials due to their high strength to low weight ratios. However, due to their low shear strength, failure can occur due to kink bands that develop on compression via plastic microbuckling. This phenomenon has been modeled extensively; however, experimental measurements of the strain fields leading to and developing inside these bands are scarce, as the sample preparation for digital image correlation (DIC) requires a microscale speckle pattern, which is hard to obtain using inks as PMCs they absorb them. In this study, two dimensional DIC is used to measure strains inside kink bands during 3-point bending of Dyneema HB80 samples. A novel micro-scale speckle pattern along with precision optics have been used to measure strains within the kink band, which had a width of approximately 600 micrometers. The speckle pattern was created by dropping copper particles through fine mesh sifters on a thin adhesive film that was applied and cured on the side surface of beam samples. This led to speckle dots that have a minimum of 15–20, μm mean diameter along with an inter-spacing ≤10, μm through the kinkband width. Images were captured during sample loading and processedusing ARAMIS software. Measurements indicate a mixture of large shear and normal strains (∼30%) in Dyneema HB80 inside the kink band.

LanguageEnglish (US)
Pages243-246
Number of pages4
JournalConference Proceedings of the Society for Experimental Mechanics Series
Issue number200869
DOIs
StatePublished - 2017

Fingerprint

Polymer matrix composites
Speckle
Ink
Shear strength
Optics
Adhesives
Compaction
Plastics
Copper

Keywords

  • Deformation localization
  • Digital image correlation
  • Kink band
  • Micro-scale speckle pattern
  • Plastic microbuckling
  • Polymer matrix composites

ASJC Scopus subject areas

  • Engineering(all)
  • Computational Mechanics
  • Mechanical Engineering

Cite this

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title = "Characterization of deformation localization mechanisms in polymer matrix composites: A digital image correlation study",
abstract = "Polymer matrix composites (PMCs) are attractive structural materials due to their high strength to low weight ratios. However, due to their low shear strength, failure can occur due to kink bands that develop on compression via plastic microbuckling. This phenomenon has been modeled extensively; however, experimental measurements of the strain fields leading to and developing inside these bands are scarce, as the sample preparation for digital image correlation (DIC) requires a microscale speckle pattern, which is hard to obtain using inks as PMCs they absorb them. In this study, two dimensional DIC is used to measure strains inside kink bands during 3-point bending of Dyneema HB80 samples. A novel micro-scale speckle pattern along with precision optics have been used to measure strains within the kink band, which had a width of approximately 600 micrometers. The speckle pattern was created by dropping copper particles through fine mesh sifters on a thin adhesive film that was applied and cured on the side surface of beam samples. This led to speckle dots that have a minimum of 15–20, μm mean diameter along with an inter-spacing ≤10, μm through the kinkband width. Images were captured during sample loading and processedusing ARAMIS™ software. Measurements indicate a mixture of large shear and normal strains (∼30{\%}) in Dyneema HB80 inside the kink band.",
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