Evaluation of the strain-based partitioning method for mixed-mode I+II fracture of bi-material cracks

Title

Evaluation of the strain-based partitioning method for mixed-mode I+II fracture of bi-material cracks

 Author

Moreira Arouche, M. (TU Delft Steel & Composite Structures; Federal Center for Technological Education of Rio de Janeiro) ORCID 0000-0001-9151-5496
Teixeira De Freitas, S. (TU Delft Structural Integrity & Composites) ORCID 0000-0002-0847-6287
de Barros, Silvio (Federal Center for Technological Education of Rio de Janeiro; Lineact Cesi, Arras)

Date

2021

 Abstract

The goal of this paper is to evaluate the strain-based partitioning method (SBM), an analytical method based on beam analysis, for the mixed-mode fracture characterization of asymmetric cracks. The fracture energy is calculated at the crack tip of mixed-mode bending (MMB) test with asymmetric geometry and asymmetric material parameters. The fracture energy obtained using SBM is benchmarked against the widely applied Williams’ partitioning method (WM) and numerical results from finite element models using the virtual crack closure technique (VCCT). Results show that WM produces inaccurate fracture modes in asymmetric conditions. However, if using SBM, the fracture mode ratio of bi-material cracks was obtained with accuracy. SBM describes a coupling function between mode I and mode II fracture that allows the mode partitioning as long the specimen complies with a simple design criterion based on the longitudinal strain equivalence between arms. Experimental results of composite-to-metal bonded joints validate the results of the parametric study. SBM proves to be an easy and reliable solution for the mixed-mode fracture characterization of bi-material cracks.


 Subject

bonded joints
composite materials
Crack propagation
finite element analysis
mixed mode fracture
strain-based method (SBM)

 To reference this document use:

http://resolver.tudelft.nl/uuid:8c167e53-e5f2-4dee-930a-3ff87c2b2af7

 DOI

https://doi.org/10.1080/00218464.2021.1981297

 ISSN

0021-8464

 Source

The Journal of Adhesion, 98 (6), 577-605

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2021 M. Moreira Arouche, S. Teixeira De Freitas, Silvio de Barros
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