Experimental determination of Through-Thickness Compression (TTC) enhancement factor for Mode II fracture energy

Xiaodong Xu; Michael Wisnom; Xiaoyang Sun; Tamas Rev; Stephen Hallett

doi:10.1016/j.compscitech.2018.06.012

Experimental determination of Through-Thickness Compression (TTC) enhancement factor for Mode II fracture energy

Xiaodong Xu^*, Michael Wisnom, Xiaoyang Sun, Tamas Rev, Stephen Hallett

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

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Abstract

Mode II fracture energy, G_IIC, is a critical parameter for determining the propagation of delamination in composite laminates. Its value can be affected by Through-Thickness Compression (TTC) stress acting on the crack tip and here this effect has been studied using IM7/8552 carbon/epoxy laminates with cut central plies. External TTC loads were applied through bi-axial testing. Unidirectional (UD) cut-ply specimens were used to determine the TTC enhancement factor, η_G, for G_IIC. A similar enhancement effect was also found in Quasi-isotropic (QI) specimens with 2 extra cut central 0° plies inserted into the layup. The TTC enhancement factor was implemented in a Finite Element Analysis (FEA) framework using cohesive interface elements, showing that the determined η_G can be successfully used to model the effect of TTC on delamination.

Original language	English
Pages (from-to)	66-73
Number of pages	8
Journal	Composites Science and Technology
Volume	165
Early online date	15 Jun 2018
DOIs	https://doi.org/10.1016/j.compscitech.2018.06.012
Publication status	Published - 8 Sept 2018

Keywords

B. Delamination
B. Fracture toughness
Bi-axial testing
C. Finite element analysis (FEA)

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title = "Experimental determination of Through-Thickness Compression (TTC) enhancement factor for Mode II fracture energy",

abstract = "Mode II fracture energy, GIIC, is a critical parameter for determining the propagation of delamination in composite laminates. Its value can be affected by Through-Thickness Compression (TTC) stress acting on the crack tip and here this effect has been studied using IM7/8552 carbon/epoxy laminates with cut central plies. External TTC loads were applied through bi-axial testing. Unidirectional (UD) cut-ply specimens were used to determine the TTC enhancement factor, ηG, for GIIC. A similar enhancement effect was also found in Quasi-isotropic (QI) specimens with 2 extra cut central 0° plies inserted into the layup. The TTC enhancement factor was implemented in a Finite Element Analysis (FEA) framework using cohesive interface elements, showing that the determined ηG can be successfully used to model the effect of TTC on delamination.",

keywords = "B. Delamination, B. Fracture toughness, Bi-axial testing, C. Finite element analysis (FEA)",

author = "Xiaodong Xu and Michael Wisnom and Xiaoyang Sun and Tamas Rev and Stephen Hallett",

year = "2018",

month = sep,

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doi = "10.1016/j.compscitech.2018.06.012",

language = "English",

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journal = "Composites Science and Technology",

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TY - JOUR

T1 - Experimental determination of Through-Thickness Compression (TTC) enhancement factor for Mode II fracture energy

AU - Xu, Xiaodong

AU - Wisnom, Michael

AU - Sun, Xiaoyang

AU - Rev, Tamas

AU - Hallett, Stephen

PY - 2018/9/8

Y1 - 2018/9/8

N2 - Mode II fracture energy, GIIC, is a critical parameter for determining the propagation of delamination in composite laminates. Its value can be affected by Through-Thickness Compression (TTC) stress acting on the crack tip and here this effect has been studied using IM7/8552 carbon/epoxy laminates with cut central plies. External TTC loads were applied through bi-axial testing. Unidirectional (UD) cut-ply specimens were used to determine the TTC enhancement factor, ηG, for GIIC. A similar enhancement effect was also found in Quasi-isotropic (QI) specimens with 2 extra cut central 0° plies inserted into the layup. The TTC enhancement factor was implemented in a Finite Element Analysis (FEA) framework using cohesive interface elements, showing that the determined ηG can be successfully used to model the effect of TTC on delamination.

AB - Mode II fracture energy, GIIC, is a critical parameter for determining the propagation of delamination in composite laminates. Its value can be affected by Through-Thickness Compression (TTC) stress acting on the crack tip and here this effect has been studied using IM7/8552 carbon/epoxy laminates with cut central plies. External TTC loads were applied through bi-axial testing. Unidirectional (UD) cut-ply specimens were used to determine the TTC enhancement factor, ηG, for GIIC. A similar enhancement effect was also found in Quasi-isotropic (QI) specimens with 2 extra cut central 0° plies inserted into the layup. The TTC enhancement factor was implemented in a Finite Element Analysis (FEA) framework using cohesive interface elements, showing that the determined ηG can be successfully used to model the effect of TTC on delamination.

KW - B. Delamination

KW - B. Fracture toughness

KW - Bi-axial testing

KW - C. Finite element analysis (FEA)

UR - http://www.scopus.com/inward/record.url?scp=85048710417&partnerID=8YFLogxK

U2 - 10.1016/j.compscitech.2018.06.012

DO - 10.1016/j.compscitech.2018.06.012

M3 - Article (Academic Journal)

AN - SCOPUS:85048710417

SN - 0266-3538

VL - 165

SP - 66

EP - 73

JO - Composites Science and Technology

JF - Composites Science and Technology

ER -

Experimental determination of Through-Thickness Compression (TTC) enhancement factor for Mode II fracture energy

Abstract

Keywords

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