Approximate interlaminar fracture envelopes for unidirectional E-glass/polyester composite

A. Szekrényes, József Uj

Research output: Contribution to journalArticle

Abstract

In this paper an experimental study is performed in order to determine an approximate interlaminar fracture envelope of a unidirectional E-glass polyester composite. First, the pure mode-I fracture toughness is determined by using the standard double-cantilever beam (DCB) specimen. Second, the pure mode-II toughness of the material is evaluated by means of the over-notched flexure (ONF) specimen. Finally, the mixed-mode toughness is determined with the aid of the over-leg bending (OLB) coupon. Both the initiation and propagation fracture toughness are determined within the extended ranges of crack length. The fracture envelopes are determined by using the steady-state values of the fracture toughness at crack initiation and propagation. Two criteria are used to obtain the envelopes: the traditional power expression and the physically more acceptable criterion by Williams. The results are compared with previous envelopes and similarity is established.

Original languageEnglish
Pages (from-to)15-24
Number of pages10
JournalPeriodica Polytechnica, Mechanical Engineering
Volume49
Issue number1
Publication statusPublished - 2005

Fingerprint

Polyesters
Fracture toughness
Glass
Toughness
Composite materials
Cantilever beams
Crack initiation
Crack propagation
Cracks

Keywords

  • Composite
  • Delamination
  • Double-cantilever beam
  • Fracture envelope
  • Fracture toughness
  • Over-leg bending
  • Over-notched flexure

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Approximate interlaminar fracture envelopes for unidirectional E-glass/polyester composite. / Szekrényes, A.; Uj, József.

In: Periodica Polytechnica, Mechanical Engineering, Vol. 49, No. 1, 2005, p. 15-24.

Research output: Contribution to journalArticle

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