Scaling effect of crack density in GFRP laminates: Introduction to a multiscale fatigue testing scheme and finding an appropriate biaxial zone shape of the cruciform specimen

A. Moncy*, C. Berggreen

*Corresponding author for this work

Research output: Contribution to conferencePaperResearchpeer-review

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Abstract

The number of off-axis cracks in a multidirectional laminate or crack density has been identified as an important fatigue parameter for laminate composites and it is related to its stiffness degradation. But for implementing crack density as a fatigue parameter in a multiscale modelling scheme, it is important to investigate its sensitivity to scale effects. In this research, rectangular coupon and cruciform specimens with variation in the in-plane dimensions are loaded in tension-tension fatigue where the crack density evolution is monitored with white light imaging. But the design of a cruciform specimen is not straightforward and is heavily dependent on the research goal. This particular work focuses on the design of the cruciform specimen through finite element simulations by comparing 4 biaxial zone geometries - circle, square, rhombus and curved square, investigating the uniformity of the induced strain state in the biaxial zone. A circular biaxial zone is found to be appropriate. The multi-scale fatigue testing and modelling scheme of the CASMaT Initiation Project at the Technical University of Denmark is presented as well.

Original languageEnglish
Publication date2018
Number of pages7
Publication statusPublished - 2018
Event7th International Conference on Fatigue of Composites (ICFC7) - Vicenza, Italy
Duration: 4 Jul 20186 Jul 2018

Conference

Conference7th International Conference on Fatigue of Composites (ICFC7)
CountryItaly
CityVicenza
Period04/07/201806/07/2018

Keywords

  • Cruciform
  • Fatigue
  • Finite Element Analysis
  • Scale Effect

Cite this

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title = "Scaling effect of crack density in GFRP laminates: Introduction to a multiscale fatigue testing scheme and finding an appropriate biaxial zone shape of the cruciform specimen",
abstract = "The number of off-axis cracks in a multidirectional laminate or crack density has been identified as an important fatigue parameter for laminate composites and it is related to its stiffness degradation. But for implementing crack density as a fatigue parameter in a multiscale modelling scheme, it is important to investigate its sensitivity to scale effects. In this research, rectangular coupon and cruciform specimens with variation in the in-plane dimensions are loaded in tension-tension fatigue where the crack density evolution is monitored with white light imaging. But the design of a cruciform specimen is not straightforward and is heavily dependent on the research goal. This particular work focuses on the design of the cruciform specimen through finite element simulations by comparing 4 biaxial zone geometries - circle, square, rhombus and curved square, investigating the uniformity of the induced strain state in the biaxial zone. A circular biaxial zone is found to be appropriate. The multi-scale fatigue testing and modelling scheme of the CASMaT Initiation Project at the Technical University of Denmark is presented as well.",
keywords = "Cruciform, Fatigue, Finite Element Analysis, Scale Effect",
author = "A. Moncy and C. Berggreen",
year = "2018",
language = "English",
note = "7th International Conference on Fatigue of Composites (ICFC7) ; Conference date: 04-07-2018 Through 06-07-2018",

}

Moncy, A & Berggreen, C 2018, 'Scaling effect of crack density in GFRP laminates: Introduction to a multiscale fatigue testing scheme and finding an appropriate biaxial zone shape of the cruciform specimen' Paper presented at 7th International Conference on Fatigue of Composites (ICFC7) , Vicenza, Italy, 04/07/2018 - 06/07/2018, .

Scaling effect of crack density in GFRP laminates: Introduction to a multiscale fatigue testing scheme and finding an appropriate biaxial zone shape of the cruciform specimen. / Moncy, A.; Berggreen, C.

2018. Paper presented at 7th International Conference on Fatigue of Composites (ICFC7) , Vicenza, Italy.

Research output: Contribution to conferencePaperResearchpeer-review

TY - CONF

T1 - Scaling effect of crack density in GFRP laminates: Introduction to a multiscale fatigue testing scheme and finding an appropriate biaxial zone shape of the cruciform specimen

AU - Moncy, A.

AU - Berggreen, C.

PY - 2018

Y1 - 2018

N2 - The number of off-axis cracks in a multidirectional laminate or crack density has been identified as an important fatigue parameter for laminate composites and it is related to its stiffness degradation. But for implementing crack density as a fatigue parameter in a multiscale modelling scheme, it is important to investigate its sensitivity to scale effects. In this research, rectangular coupon and cruciform specimens with variation in the in-plane dimensions are loaded in tension-tension fatigue where the crack density evolution is monitored with white light imaging. But the design of a cruciform specimen is not straightforward and is heavily dependent on the research goal. This particular work focuses on the design of the cruciform specimen through finite element simulations by comparing 4 biaxial zone geometries - circle, square, rhombus and curved square, investigating the uniformity of the induced strain state in the biaxial zone. A circular biaxial zone is found to be appropriate. The multi-scale fatigue testing and modelling scheme of the CASMaT Initiation Project at the Technical University of Denmark is presented as well.

AB - The number of off-axis cracks in a multidirectional laminate or crack density has been identified as an important fatigue parameter for laminate composites and it is related to its stiffness degradation. But for implementing crack density as a fatigue parameter in a multiscale modelling scheme, it is important to investigate its sensitivity to scale effects. In this research, rectangular coupon and cruciform specimens with variation in the in-plane dimensions are loaded in tension-tension fatigue where the crack density evolution is monitored with white light imaging. But the design of a cruciform specimen is not straightforward and is heavily dependent on the research goal. This particular work focuses on the design of the cruciform specimen through finite element simulations by comparing 4 biaxial zone geometries - circle, square, rhombus and curved square, investigating the uniformity of the induced strain state in the biaxial zone. A circular biaxial zone is found to be appropriate. The multi-scale fatigue testing and modelling scheme of the CASMaT Initiation Project at the Technical University of Denmark is presented as well.

KW - Cruciform

KW - Fatigue

KW - Finite Element Analysis

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