Image processing assisted stress estimation method for ring compression tests of polymer composite pipes at large displacements

G. Czél, T. Czigány

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A novel method for estimating the fracture stress of ring specimens cut from polymer composite pipes is presented. The method applies image processing for determining the large displacements of the specimen. For image processing, photographs of the deformed specimen were taken before fracture, and a Fourier polynomial was fitted to the points of the digitalized cross section of the ring specimen. The presented mechanical model is based on the captured deformed shape, and it considers the geometrical nonlinearities of the problem. For stress calculation from bending moments, the Navier formula was selected. It was found that the developed method is capable of estimating the stress at break of polymer composite specimens under ring compression.

Original languageEnglish
Pages (from-to)2803-2809
Number of pages7
JournalJournal of Composite Materials
Volume46
Issue number22
DOIs
Publication statusPublished - Oct 2012

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Polymers
Image processing
Compaction
Pipe
Composite materials
Bending moments
Polynomials

Keywords

  • filament winding
  • GF/UP
  • image processing
  • polymer composite pipe
  • Ring compression

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

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AU - Czél, G.

AU - Czigány, T.

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AB - A novel method for estimating the fracture stress of ring specimens cut from polymer composite pipes is presented. The method applies image processing for determining the large displacements of the specimen. For image processing, photographs of the deformed specimen were taken before fracture, and a Fourier polynomial was fitted to the points of the digitalized cross section of the ring specimen. The presented mechanical model is based on the captured deformed shape, and it considers the geometrical nonlinearities of the problem. For stress calculation from bending moments, the Navier formula was selected. It was found that the developed method is capable of estimating the stress at break of polymer composite specimens under ring compression.

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KW - image processing

KW - polymer composite pipe

KW - Ring compression

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