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The Influence of Background Ultrasonic Field on the Strength of Adhesive Zones under Dynamic Impact Loads

The influence of background ultrasonic field on the ultimate dynamic strength of adhesive joints is studied using fracture mechanics analysis. Winkler foundation-type models are applied to describe the cohesion zone, and the incubation time fracture criterion is used. The challenging task is to stud...

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Autores principales: Volkov, Grigory, Logachev, Andrey, Granichin, Nikolai, Zhao, Ya-Pu, Zhang, Yin, Petrov, Yuri
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8229004/
https://www.ncbi.nlm.nih.gov/pubmed/34207824
http://dx.doi.org/10.3390/ma14123188
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author Volkov, Grigory
Logachev, Andrey
Granichin, Nikolai
Zhao, Ya-Pu
Zhang, Yin
Petrov, Yuri
author_facet Volkov, Grigory
Logachev, Andrey
Granichin, Nikolai
Zhao, Ya-Pu
Zhang, Yin
Petrov, Yuri
author_sort Volkov, Grigory
collection PubMed
description The influence of background ultrasonic field on the ultimate dynamic strength of adhesive joints is studied using fracture mechanics analysis. Winkler foundation-type models are applied to describe the cohesion zone, and the incubation time fracture criterion is used. The challenging task is to study whether relatively weak ultrasound is able to decrease the threshold values of the external impact load depending on a joint model, such as an “elastic membrane” or “beam” approximation, and various boundary conditions at the ends. The specific task was to investigate the case of short pulse loading through application of time-dependent fracture criterion instead of the conventional principle of critical stress. Three different load cases, namely, step constant force, dynamic pulse, and their combination with ultrasonic vibrations, were also studied. The analytical solution to the problem demonstrates that background vibrations at certain frequencies can significantly decrease threshold values of fracture impact load. Specific calculations indicate that even a weak background sonic field is enough to cause a significant reduction in the threshold amplitude of a dynamic short pulse load. Additionally, non-monotonic dependency of threshold amplitude on pulse duration for weak background field was observed, which demonstrates the existence of optimal regimes of impact energy input. Moreover, this phenomenon does not depend on the way in which the beam edges mount, whether they are clamped or hinged, and it could be applied for micro-electro-mechanical switch design processes as an additional tool to control operational regimes.
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spelling pubmed-82290042021-06-26 The Influence of Background Ultrasonic Field on the Strength of Adhesive Zones under Dynamic Impact Loads Volkov, Grigory Logachev, Andrey Granichin, Nikolai Zhao, Ya-Pu Zhang, Yin Petrov, Yuri Materials (Basel) Article The influence of background ultrasonic field on the ultimate dynamic strength of adhesive joints is studied using fracture mechanics analysis. Winkler foundation-type models are applied to describe the cohesion zone, and the incubation time fracture criterion is used. The challenging task is to study whether relatively weak ultrasound is able to decrease the threshold values of the external impact load depending on a joint model, such as an “elastic membrane” or “beam” approximation, and various boundary conditions at the ends. The specific task was to investigate the case of short pulse loading through application of time-dependent fracture criterion instead of the conventional principle of critical stress. Three different load cases, namely, step constant force, dynamic pulse, and their combination with ultrasonic vibrations, were also studied. The analytical solution to the problem demonstrates that background vibrations at certain frequencies can significantly decrease threshold values of fracture impact load. Specific calculations indicate that even a weak background sonic field is enough to cause a significant reduction in the threshold amplitude of a dynamic short pulse load. Additionally, non-monotonic dependency of threshold amplitude on pulse duration for weak background field was observed, which demonstrates the existence of optimal regimes of impact energy input. Moreover, this phenomenon does not depend on the way in which the beam edges mount, whether they are clamped or hinged, and it could be applied for micro-electro-mechanical switch design processes as an additional tool to control operational regimes. MDPI 2021-06-09 /pmc/articles/PMC8229004/ /pubmed/34207824 http://dx.doi.org/10.3390/ma14123188 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Volkov, Grigory
Logachev, Andrey
Granichin, Nikolai
Zhao, Ya-Pu
Zhang, Yin
Petrov, Yuri
The Influence of Background Ultrasonic Field on the Strength of Adhesive Zones under Dynamic Impact Loads
title The Influence of Background Ultrasonic Field on the Strength of Adhesive Zones under Dynamic Impact Loads
title_full The Influence of Background Ultrasonic Field on the Strength of Adhesive Zones under Dynamic Impact Loads
title_fullStr The Influence of Background Ultrasonic Field on the Strength of Adhesive Zones under Dynamic Impact Loads
title_full_unstemmed The Influence of Background Ultrasonic Field on the Strength of Adhesive Zones under Dynamic Impact Loads
title_short The Influence of Background Ultrasonic Field on the Strength of Adhesive Zones under Dynamic Impact Loads
title_sort influence of background ultrasonic field on the strength of adhesive zones under dynamic impact loads
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8229004/
https://www.ncbi.nlm.nih.gov/pubmed/34207824
http://dx.doi.org/10.3390/ma14123188
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