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A concept for defining the mixed-mode behaviour of tough epoxy film adhesives by single specimen design

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A concept for defining the mixed-mode behaviour of tough epoxy film adhesives by single specimen design. / Jokinen, Jarno; Orell, Olli; Wallin, Markus; Kanerva, Mikko.

In: Journal of Adhesion Science and Technology, 2020.

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@article{0ac027abec934e8fa919afd4fde36178,
title = "A concept for defining the mixed-mode behaviour of tough epoxy film adhesives by single specimen design",
abstract = "Fracture modes I and II interact in mixed-mode loading conditions, and the interaction is typically taken into account using a mixed-mode fracture criterion. In this work, a concept for defining the criterion is developed through an experimental-numerical simulation analysis. The mixed-mode behaviour for the criterion is tested and analysed with a single specimen design. The design of the specimen simplifies the measurement when complex test arrangements and preparations for various specimen geometries are excluded in practice. Here, the mixed-mode fracture behaviour of the specimen is analysed in detail using digital image correlation (DIC). The DIC data are used in collaboration with a finite element–based crack onset analysis, including the virtual crack closure technique, in order to consider the typical simplifications and their effects on the mixed-mode criterion. As a benchmark case, the fracture criterion is determined for an epoxy film adhesive FM 300-2 using the developed approach. The developed approach was shown to be feasible and effective for defining the mixed-mode fracture criterion. The determined Power law criterion’s exponents were below unity, which points out that the common (presumed) exponent values in the current literature are actually unconservative.",
keywords = "adhesive, mixed-mode testing, epoxy, virtual crack closure technique, digital image correlation",
author = "Jarno Jokinen and Olli Orell and Markus Wallin and Mikko Kanerva",
year = "2020",
doi = "10.1080/01694243.2020.1746606",
language = "English",
journal = "Journal of Adhesion Science and Technology",
issn = "0169-4243",
publisher = "Taylor & Francis",

}

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TY - JOUR

T1 - A concept for defining the mixed-mode behaviour of tough epoxy film adhesives by single specimen design

AU - Jokinen, Jarno

AU - Orell, Olli

AU - Wallin, Markus

AU - Kanerva, Mikko

PY - 2020

Y1 - 2020

N2 - Fracture modes I and II interact in mixed-mode loading conditions, and the interaction is typically taken into account using a mixed-mode fracture criterion. In this work, a concept for defining the criterion is developed through an experimental-numerical simulation analysis. The mixed-mode behaviour for the criterion is tested and analysed with a single specimen design. The design of the specimen simplifies the measurement when complex test arrangements and preparations for various specimen geometries are excluded in practice. Here, the mixed-mode fracture behaviour of the specimen is analysed in detail using digital image correlation (DIC). The DIC data are used in collaboration with a finite element–based crack onset analysis, including the virtual crack closure technique, in order to consider the typical simplifications and their effects on the mixed-mode criterion. As a benchmark case, the fracture criterion is determined for an epoxy film adhesive FM 300-2 using the developed approach. The developed approach was shown to be feasible and effective for defining the mixed-mode fracture criterion. The determined Power law criterion’s exponents were below unity, which points out that the common (presumed) exponent values in the current literature are actually unconservative.

AB - Fracture modes I and II interact in mixed-mode loading conditions, and the interaction is typically taken into account using a mixed-mode fracture criterion. In this work, a concept for defining the criterion is developed through an experimental-numerical simulation analysis. The mixed-mode behaviour for the criterion is tested and analysed with a single specimen design. The design of the specimen simplifies the measurement when complex test arrangements and preparations for various specimen geometries are excluded in practice. Here, the mixed-mode fracture behaviour of the specimen is analysed in detail using digital image correlation (DIC). The DIC data are used in collaboration with a finite element–based crack onset analysis, including the virtual crack closure technique, in order to consider the typical simplifications and their effects on the mixed-mode criterion. As a benchmark case, the fracture criterion is determined for an epoxy film adhesive FM 300-2 using the developed approach. The developed approach was shown to be feasible and effective for defining the mixed-mode fracture criterion. The determined Power law criterion’s exponents were below unity, which points out that the common (presumed) exponent values in the current literature are actually unconservative.

KW - adhesive

KW - mixed-mode testing

KW - epoxy

KW - virtual crack closure technique

KW - digital image correlation

U2 - 10.1080/01694243.2020.1746606

DO - 10.1080/01694243.2020.1746606

M3 - Article

JO - Journal of Adhesion Science and Technology

JF - Journal of Adhesion Science and Technology

SN - 0169-4243

ER -