Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength

Interfacial debonding in fiber-reinforced composites is a common problem, especially in external strengthening techniques. This investigation aims to determine the load during debonding, and discusses two practical design parameters for direct shear tests, which are commonly used to assess the mecha...

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Autores principales:	Amir Mohammad Mirzaei, Mauro Corrado, Alberto Sapora, Pietro Cornetti
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	debonding composite joints friction fiber-reinforced cementitious matrix (FRCM) composites pull-push test shear lag model Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/642019be0cf2480a883a49c40538a2a8
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spelling	oai:doaj.org-article:642019be0cf2480a883a49c40538a2a82021-11-11T18:11:40ZAnalytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength10.3390/ma142166901996-1944https://doaj.org/article/642019be0cf2480a883a49c40538a2a82021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6690https://doaj.org/toc/1996-1944Interfacial debonding in fiber-reinforced composites is a common problem, especially in external strengthening techniques. This investigation aims to determine the load during debonding, and discusses two practical design parameters for direct shear tests, which are commonly used to assess the mechanics of debonding. In this study, three different bond-slip cohesive laws and one finite fracture mechanics approach are considered to investigate debonding in direct shear tests by taking the effect of residual strength into account. For each model, load during debonding and its maximum value are given by closed-form expressions, which are then checked against experimental data reported in the literature. It is shown that using the interfacial mechanical properties extracted from one geometry, the debonding load of tests with different bond lengths and widths can be predicted without any fitting procedure. Moreover, effective bond length formulae are suggested for each model; one is the straightforward extension (accounting for residual strength) of a formula available in the Standards. The results illustrate the importance of considering residual strength in direct shear tests, even at debonding onset, with its effect being nonetheless higher for long bond lengths.Amir Mohammad MirzaeiMauro CorradoAlberto SaporaPietro CornettiMDPI AGarticledebondingcomposite jointsfrictionfiber-reinforced cementitious matrix (FRCM) compositespull-push testshear lag modelTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6690, p 6690 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	debonding composite joints friction fiber-reinforced cementitious matrix (FRCM) composites pull-push test shear lag model Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	debonding composite joints friction fiber-reinforced cementitious matrix (FRCM) composites pull-push test shear lag model Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Amir Mohammad Mirzaei Mauro Corrado Alberto Sapora Pietro Cornetti Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength
description	Interfacial debonding in fiber-reinforced composites is a common problem, especially in external strengthening techniques. This investigation aims to determine the load during debonding, and discusses two practical design parameters for direct shear tests, which are commonly used to assess the mechanics of debonding. In this study, three different bond-slip cohesive laws and one finite fracture mechanics approach are considered to investigate debonding in direct shear tests by taking the effect of residual strength into account. For each model, load during debonding and its maximum value are given by closed-form expressions, which are then checked against experimental data reported in the literature. It is shown that using the interfacial mechanical properties extracted from one geometry, the debonding load of tests with different bond lengths and widths can be predicted without any fitting procedure. Moreover, effective bond length formulae are suggested for each model; one is the straightforward extension (accounting for residual strength) of a formula available in the Standards. The results illustrate the importance of considering residual strength in direct shear tests, even at debonding onset, with its effect being nonetheless higher for long bond lengths.
format	article
author	Amir Mohammad Mirzaei Mauro Corrado Alberto Sapora Pietro Cornetti
author_facet	Amir Mohammad Mirzaei Mauro Corrado Alberto Sapora Pietro Cornetti
author_sort	Amir Mohammad Mirzaei
title	Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength
title_short	Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength
title_full	Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength
title_fullStr	Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength
title_full_unstemmed	Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength
title_sort	analytical modeling of debonding mechanism for long and short bond lengths in direct shear tests accounting for residual strength
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/642019be0cf2480a883a49c40538a2a8
work_keys_str_mv	AT amirmohammadmirzaei analyticalmodelingofdebondingmechanismforlongandshortbondlengthsindirectsheartestsaccountingforresidualstrength AT maurocorrado analyticalmodelingofdebondingmechanismforlongandshortbondlengthsindirectsheartestsaccountingforresidualstrength AT albertosapora analyticalmodelingofdebondingmechanismforlongandshortbondlengthsindirectsheartestsaccountingforresidualstrength AT pietrocornetti analyticalmodelingofdebondingmechanismforlongandshortbondlengthsindirectsheartestsaccountingforresidualstrength
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Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength

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