Deducing the R-curve for trans-laminar fracture from a virtual Over-height Compact Tension (OCT) test

Xiaodong Xu; Michael R. Wisnom; Stephen R. Hallett

doi:10.1016/j.compositesa.2018.12.027

Deducing the R-curve for trans-laminar fracture from a virtual Over-height Compact Tension (OCT) test

Xiaodong Xu^*, Michael R. Wisnom, Stephen R. Hallett

^*Corresponding author for this work

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

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Abstract

The R-curve for Mode I trans-laminar fracture energy in quasi-isotropic IM7/8552 carbon/epoxy laminates is here deduced numerically from a virtual Over-height Compact Tension (OCT) test. A High-fidelity Finite Element Method (Hi-FEM) using the explicit Finite Element (FE) software LS-Dyna was adopted. Cohesive interface elements and a Weibull fibre failure criterion were used to predict failure. The input parameters for the Hi-FEM were measured from independent characterisation tests. OCT specimens were tested to verify the Hi-FEM results with good agreement. The R-curve effect is postulated to be caused by the growth of the height of the Fracture Process Zone (FPZ) with crack length. Hi-FEM can be used to better understand Mode I trans-laminar fracture toughness tests and generate fracture properties such as damage heights and R-curves for future structural scale models.

Original language	English
Pages (from-to)	162-170
Number of pages	9
Journal	Composites Part A: Applied Science and Manufacturing
Volume	118
Early online date	31 Dec 2018
DOIs	https://doi.org/10.1016/j.compositesa.2018.12.027
Publication status	Published - Mar 2019

Research Groups and Themes

Bristol Composites Institute ACCIS

Keywords

Laminates
Fracture
Fracture Toughness
Finite Element Analysis (FEA)
R-curve

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Accepted author manuscript, 1.36 MBLicence: CC BY-NC-ND

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title = "Deducing the R-curve for trans-laminar fracture from a virtual Over-height Compact Tension (OCT) test",

abstract = "The R-curve for Mode I trans-laminar fracture energy in quasi-isotropic IM7/8552 carbon/epoxy laminates is here deduced numerically from a virtual Over-height Compact Tension (OCT) test. A High-fidelity Finite Element Method (Hi-FEM) using the explicit Finite Element (FE) software LS-Dyna was adopted. Cohesive interface elements and a Weibull fibre failure criterion were used to predict failure. The input parameters for the Hi-FEM were measured from independent characterisation tests. OCT specimens were tested to verify the Hi-FEM results with good agreement. The R-curve effect is postulated to be caused by the growth of the height of the Fracture Process Zone (FPZ) with crack length. Hi-FEM can be used to better understand Mode I trans-laminar fracture toughness tests and generate fracture properties such as damage heights and R-curves for future structural scale models.",

keywords = "Laminates, Fracture, Fracture Toughness, Finite Element Analysis (FEA), R-curve",

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T1 - Deducing the R-curve for trans-laminar fracture from a virtual Over-height Compact Tension (OCT) test

AU - Xu, Xiaodong

AU - Wisnom, Michael R.

AU - Hallett, Stephen R.

PY - 2019/3

Y1 - 2019/3

N2 - The R-curve for Mode I trans-laminar fracture energy in quasi-isotropic IM7/8552 carbon/epoxy laminates is here deduced numerically from a virtual Over-height Compact Tension (OCT) test. A High-fidelity Finite Element Method (Hi-FEM) using the explicit Finite Element (FE) software LS-Dyna was adopted. Cohesive interface elements and a Weibull fibre failure criterion were used to predict failure. The input parameters for the Hi-FEM were measured from independent characterisation tests. OCT specimens were tested to verify the Hi-FEM results with good agreement. The R-curve effect is postulated to be caused by the growth of the height of the Fracture Process Zone (FPZ) with crack length. Hi-FEM can be used to better understand Mode I trans-laminar fracture toughness tests and generate fracture properties such as damage heights and R-curves for future structural scale models.

AB - The R-curve for Mode I trans-laminar fracture energy in quasi-isotropic IM7/8552 carbon/epoxy laminates is here deduced numerically from a virtual Over-height Compact Tension (OCT) test. A High-fidelity Finite Element Method (Hi-FEM) using the explicit Finite Element (FE) software LS-Dyna was adopted. Cohesive interface elements and a Weibull fibre failure criterion were used to predict failure. The input parameters for the Hi-FEM were measured from independent characterisation tests. OCT specimens were tested to verify the Hi-FEM results with good agreement. The R-curve effect is postulated to be caused by the growth of the height of the Fracture Process Zone (FPZ) with crack length. Hi-FEM can be used to better understand Mode I trans-laminar fracture toughness tests and generate fracture properties such as damage heights and R-curves for future structural scale models.

KW - Laminates

KW - Fracture

KW - Fracture Toughness

KW - Finite Element Analysis (FEA)

KW - R-curve

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DO - 10.1016/j.compositesa.2018.12.027

M3 - Article (Academic Journal)

AN - SCOPUS:85059458246

SN - 1359-835X

VL - 118

SP - 162

EP - 170

JO - Composites Part A: Applied Science and Manufacturing

JF - Composites Part A: Applied Science and Manufacturing

ER -

Deducing the R-curve for trans-laminar fracture from a virtual Over-height Compact Tension (OCT) test

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Keywords

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