Experimental and numerical investigation on fracture behavior of glass/carbon fiber hybrid composites using acoustic emission method and refined zigzag theory

Isa Emami Tabrizi, Adnan Kefal, Jamal Seyyed Monfared Zanjani, Cagdas Akalin, Mehmet Yildiz

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

In this study, damage evolution in glass/carbon fiber hybrid composites with various stacking sequences is investigated under pure bending and tensile loading conditions. Based on the experimental tests results, the hybrid effect and ratio is calculated for all laminates. Damage occurrence is recorded using acoustic emission method and then damage types are classified by means of K-means algorithm. Results show four clusters of acoustic data corresponding to four failure types, i.e., matrix cracking, interface failure, fiber pullout, and fiber breakage. Microscopic images together with the results of acoustic emission data point out that the stacking sequence of hybrid composites becomes a dominant factor for hybrid effect in comparison to volume fraction of carbon or glass fibers under flexural loading. Moreover, the presence of glass layers beneath surface carbon layers causes a level off in acoustic emission activity which is associated with a drop and increase in stress of the stress-strain curve of the flexural test. The experimental tests are numerically simulated through finite element method (FEM) based on refined zigzag theory (RZT). Deformation results of RZT-FEM analysis demonstrate the presence of considerable amount of out-of-plane displacements in the hybrid fiber laminates. This important fact is readily captured during the RZT-FEM simulation, which leads to the interlaminar delaminations observed in the samples under tensile loading. The RZT-FEM results are also validated against the experimental strain-stress results within the linear-elastic region. Finally, the comparison of experimentally and numerically calculated strain-stress curves shows that the onset of the damage inside the material is demarcated as the deviation of experiment results from numerical ones. Remarkably, at this deviation instant, the acoustic emission activity also initiates for both tensile and bending specimens, hence confirming major damage evolution inside the laminates.

Original languageEnglish
Article number110971
JournalComposite structures
Volume223
Early online date10 May 2019
DOIs
Publication statusPublished - 1 Sep 2019
Externally publishedYes

Fingerprint

Acoustic emissions
Glass fibers
Carbon fibers
Laminates
Finite element method
Composite materials
Stress-strain curves
Fibers
Delamination
Volume fraction
Carbon
Acoustics
Glass
carbon fiber
Experiments

Keywords

  • Acoustic emission
  • Damage accumulation
  • Finite element method
  • Hybrid structures
  • Laminated composite plates
  • Refined zigzag theory

Cite this

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title = "Experimental and numerical investigation on fracture behavior of glass/carbon fiber hybrid composites using acoustic emission method and refined zigzag theory",
abstract = "In this study, damage evolution in glass/carbon fiber hybrid composites with various stacking sequences is investigated under pure bending and tensile loading conditions. Based on the experimental tests results, the hybrid effect and ratio is calculated for all laminates. Damage occurrence is recorded using acoustic emission method and then damage types are classified by means of K-means algorithm. Results show four clusters of acoustic data corresponding to four failure types, i.e., matrix cracking, interface failure, fiber pullout, and fiber breakage. Microscopic images together with the results of acoustic emission data point out that the stacking sequence of hybrid composites becomes a dominant factor for hybrid effect in comparison to volume fraction of carbon or glass fibers under flexural loading. Moreover, the presence of glass layers beneath surface carbon layers causes a level off in acoustic emission activity which is associated with a drop and increase in stress of the stress-strain curve of the flexural test. The experimental tests are numerically simulated through finite element method (FEM) based on refined zigzag theory (RZT). Deformation results of RZT-FEM analysis demonstrate the presence of considerable amount of out-of-plane displacements in the hybrid fiber laminates. This important fact is readily captured during the RZT-FEM simulation, which leads to the interlaminar delaminations observed in the samples under tensile loading. The RZT-FEM results are also validated against the experimental strain-stress results within the linear-elastic region. Finally, the comparison of experimentally and numerically calculated strain-stress curves shows that the onset of the damage inside the material is demarcated as the deviation of experiment results from numerical ones. Remarkably, at this deviation instant, the acoustic emission activity also initiates for both tensile and bending specimens, hence confirming major damage evolution inside the laminates.",
keywords = "Acoustic emission, Damage accumulation, Finite element method, Hybrid structures, Laminated composite plates, Refined zigzag theory",
author = "Tabrizi, {Isa Emami} and Adnan Kefal and Zanjani, {Jamal Seyyed Monfared} and Cagdas Akalin and Mehmet Yildiz",
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Experimental and numerical investigation on fracture behavior of glass/carbon fiber hybrid composites using acoustic emission method and refined zigzag theory. / Tabrizi, Isa Emami; Kefal, Adnan; Zanjani, Jamal Seyyed Monfared; Akalin, Cagdas; Yildiz, Mehmet.

In: Composite structures, Vol. 223, 110971, 01.09.2019.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Experimental and numerical investigation on fracture behavior of glass/carbon fiber hybrid composites using acoustic emission method and refined zigzag theory

AU - Tabrizi, Isa Emami

AU - Kefal, Adnan

AU - Zanjani, Jamal Seyyed Monfared

AU - Akalin, Cagdas

AU - Yildiz, Mehmet

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N2 - In this study, damage evolution in glass/carbon fiber hybrid composites with various stacking sequences is investigated under pure bending and tensile loading conditions. Based on the experimental tests results, the hybrid effect and ratio is calculated for all laminates. Damage occurrence is recorded using acoustic emission method and then damage types are classified by means of K-means algorithm. Results show four clusters of acoustic data corresponding to four failure types, i.e., matrix cracking, interface failure, fiber pullout, and fiber breakage. Microscopic images together with the results of acoustic emission data point out that the stacking sequence of hybrid composites becomes a dominant factor for hybrid effect in comparison to volume fraction of carbon or glass fibers under flexural loading. Moreover, the presence of glass layers beneath surface carbon layers causes a level off in acoustic emission activity which is associated with a drop and increase in stress of the stress-strain curve of the flexural test. The experimental tests are numerically simulated through finite element method (FEM) based on refined zigzag theory (RZT). Deformation results of RZT-FEM analysis demonstrate the presence of considerable amount of out-of-plane displacements in the hybrid fiber laminates. This important fact is readily captured during the RZT-FEM simulation, which leads to the interlaminar delaminations observed in the samples under tensile loading. The RZT-FEM results are also validated against the experimental strain-stress results within the linear-elastic region. Finally, the comparison of experimentally and numerically calculated strain-stress curves shows that the onset of the damage inside the material is demarcated as the deviation of experiment results from numerical ones. Remarkably, at this deviation instant, the acoustic emission activity also initiates for both tensile and bending specimens, hence confirming major damage evolution inside the laminates.

AB - In this study, damage evolution in glass/carbon fiber hybrid composites with various stacking sequences is investigated under pure bending and tensile loading conditions. Based on the experimental tests results, the hybrid effect and ratio is calculated for all laminates. Damage occurrence is recorded using acoustic emission method and then damage types are classified by means of K-means algorithm. Results show four clusters of acoustic data corresponding to four failure types, i.e., matrix cracking, interface failure, fiber pullout, and fiber breakage. Microscopic images together with the results of acoustic emission data point out that the stacking sequence of hybrid composites becomes a dominant factor for hybrid effect in comparison to volume fraction of carbon or glass fibers under flexural loading. Moreover, the presence of glass layers beneath surface carbon layers causes a level off in acoustic emission activity which is associated with a drop and increase in stress of the stress-strain curve of the flexural test. The experimental tests are numerically simulated through finite element method (FEM) based on refined zigzag theory (RZT). Deformation results of RZT-FEM analysis demonstrate the presence of considerable amount of out-of-plane displacements in the hybrid fiber laminates. This important fact is readily captured during the RZT-FEM simulation, which leads to the interlaminar delaminations observed in the samples under tensile loading. The RZT-FEM results are also validated against the experimental strain-stress results within the linear-elastic region. Finally, the comparison of experimentally and numerically calculated strain-stress curves shows that the onset of the damage inside the material is demarcated as the deviation of experiment results from numerical ones. Remarkably, at this deviation instant, the acoustic emission activity also initiates for both tensile and bending specimens, hence confirming major damage evolution inside the laminates.

KW - Acoustic emission

KW - Damage accumulation

KW - Finite element method

KW - Hybrid structures

KW - Laminated composite plates

KW - Refined zigzag theory

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