Effects of an open hole on the biaxial strengths of composite laminates

Yuanchen Huang, SungKyu Ha, Jun Koyanagi, Jose Daniel D. Melo, Hisashi Kumazawa, Ippei Susuki

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Experimental biaxial data are essential to validate failure criteria for composite laminates. In this study an optimized design of cruciform specimen used for in-plane biaxial loading was proposed. The uniformity of strain field in the gauge region of the smooth specimen under biaxial loadings was confirmed via finite element analysis. Both smooth and open-hole specimens fabricated by π/4 quasi-isotropic carbon epoxy laminates were tested under three different biaxial stress schemes, where stresses {σx, σy} are expressed in normalized forms as {1, 0}, {1, 1}, and {1, -1}, respectively. The relations between far-field stresses and global biaxial loadings were established based on test data, and the strengths of both smooth and open-hole specimens under different biaxial loading schemes were acquired. Digital image correlation (DIC) technique was employed to measure strain field in the neighborhood of the central hole of the open-hole specimens during test, and the measurements were compared with strain distribution obtained from numerical simulations. Good agreement between DIC images and FEA results was achieved. First-ply-failure (FPF) envelopes based on micro-mechanics of failure (MMF) for both smooth and open-hole cases were drawn and compared with test data.

Original languageEnglish
Pages (from-to)2429-2445
Number of pages17
JournalJournal of Composite Materials
Volume44
Issue number20
DOIs
StatePublished - 2010 Sep 1

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Laminates
Composite materials
Finite element method
Micromechanics
Gages
Carbon
Computer simulation

Keywords

  • biaxial testing
  • open hole
  • polymer-matrix composites
  • strength

Cite this

Huang, Yuanchen ; Ha, SungKyu ; Koyanagi, Jun ; Melo, Jose Daniel D. ; Kumazawa, Hisashi ; Susuki, Ippei. / Effects of an open hole on the biaxial strengths of composite laminates. In: Journal of Composite Materials. 2010 ; Vol. 44, No. 20. pp. 2429-2445.
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abstract = "Experimental biaxial data are essential to validate failure criteria for composite laminates. In this study an optimized design of cruciform specimen used for in-plane biaxial loading was proposed. The uniformity of strain field in the gauge region of the smooth specimen under biaxial loadings was confirmed via finite element analysis. Both smooth and open-hole specimens fabricated by π/4 quasi-isotropic carbon epoxy laminates were tested under three different biaxial stress schemes, where stresses {σx, σy} are expressed in normalized forms as {1, 0}, {1, 1}, and {1, -1}, respectively. The relations between far-field stresses and global biaxial loadings were established based on test data, and the strengths of both smooth and open-hole specimens under different biaxial loading schemes were acquired. Digital image correlation (DIC) technique was employed to measure strain field in the neighborhood of the central hole of the open-hole specimens during test, and the measurements were compared with strain distribution obtained from numerical simulations. Good agreement between DIC images and FEA results was achieved. First-ply-failure (FPF) envelopes based on micro-mechanics of failure (MMF) for both smooth and open-hole cases were drawn and compared with test data.",
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Huang, Y, Ha, S, Koyanagi, J, Melo, JDD, Kumazawa, H & Susuki, I 2010, 'Effects of an open hole on the biaxial strengths of composite laminates', Journal of Composite Materials, vol. 44, no. 20, pp. 2429-2445. https://doi.org/10.1177/0021998310372841

Effects of an open hole on the biaxial strengths of composite laminates. / Huang, Yuanchen; Ha, SungKyu; Koyanagi, Jun; Melo, Jose Daniel D.; Kumazawa, Hisashi; Susuki, Ippei.

In: Journal of Composite Materials, Vol. 44, No. 20, 01.09.2010, p. 2429-2445.

Research output: Contribution to journalArticle

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