Measuring the critical energy release rate in mode II of tough, structural adhesive joints using the tapered end-notched flexure (TENF) test

Marzi, Stephan

doi:10.1140/epjst/e2012-01584-4

Cited by 23 publications

(8 citation statements)

References 3 publications

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“…As observed before by other authors, 23–28 the energy release rate increases with increasing loading rate, which can be once again related to the viscoelastic behavior of the adhesive. Additionally, a line in a semi-logarithmic scale proved to be a good fit for the experimental results.…”

Section: Resultssupporting

confidence: 83%

“…Kinloch et al., 24 in 1987, declared that a rubber-modified epoxy showed a significant increase of the fracture energy with increasing strain rate. An increase in fracture energy with increasing strain rate was also reported by Biel et al., 25 Carlberger et al., 26 Marzi et al., 27,28 and May et al. 23…”

Section: Introductionsupporting

confidence: 67%

“…Kinloch et al, 24 in 1987, declared that a rubber-modified epoxy showed a significant increase of the fracture energy with increasing strain rate. An increase in fracture energy with increasing strain rate was also reported by Biel et al, 25 Carlberger et al, 26 Marzi et al, 27,28 and May et al 23 Additionally, Carlberger et al 26 and Avendan˜o et al 29 both stated that the dependence of fracture energy in mode I and maximum tension with the strain rate can be considered linear in a semi-logarithmic scale.…”

Section: Introductionsupporting

confidence: 56%

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A strain rate dependent cohesive zone element for mode I modeling of the fracture behavior of adhesives

Borges

Nunes

Akhavan‐Safar

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Adhesives are widely used in the automotive industry as they can be used to manufacture lightweight multimaterial structures with improved strength-to-weight ratio, contributing to lower energy consumption and emissions. In this industry, it is also crucial to ensure passengers' safety and, thus, mechanical behavior of the complete automotive structure should be tested for impact conditions, including the adhesive joints within it. This work presents the development of a finite element, which models the mechanical behavior of adhesives and takes into account the strain rate dependent property variation, in mode I. The trends for the property variation were set based on an experimental study of two adhesives under three different loading conditions: quasi-static, intermediate speed, and impact. The strength was determined using bulk tensile tests and toughness using double cantilever beam, respectively. Both adhesives studied have shown an increase in ultimate stress and critical energy release rate with increasing strain rate. The property variation was then implemented on a finite element, which revealed a good agreement with the experimental results.

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Section: Resultssupporting

confidence: 83%

Section: Introductionsupporting

confidence: 67%

Section: Introductionsupporting

confidence: 56%

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A strain rate dependent cohesive zone element for mode I modeling of the fracture behavior of adhesives

Borges

Nunes

Akhavan‐Safar

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Karac et al, 14 with an analytical method, also found a relation between an approximated strain rate at the crack tip and test velocity for TDCB test, using an analytical beam on an elastic-foundation approach. For mode II fracture toughness, Marzi 15 defined shear strain rate as the local velocity divided by the adhesive thickness. During a study of the shear behaviour of adhesive layers, Leffer et al 16 found that the shear deformation rate in an end notch flexure (ENF) test varied considerably at the crack tip between the beginning of the test until fracture starts to occur for a constant crosshead displacement.…”

Section: Introductionmentioning

confidence: 99%

“…Karac et al., 14 with an analytical method, also found a relation between an approximated strain rate at the crack tip and test velocity for TDCB test, using an analytical beam on an elastic-foundation approach. For mode II fracture toughness, Marzi 15 defined shear strain rate as the local velocity divided by the adhesive thickness. During a study of the shear behaviour of adhesive layers, Leffer et al.…”

Section: Introductionmentioning

confidence: 99%

Numerical assessment of strain rate in an adhesive layer throughout double cantilever beam and end notch flexure tests

Nunes

Borges

Marques

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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The increasingly larger use of adhesive joints in the automotive industry demands a full comprehension of the adhesive behaviour when subjected to dynamic loadings. So far, some authors studied the effect of the strain rate regarding the adhesives performance, usually for the range of approximately 0–105/s; nevertheless, few studies are clear regarding the method used to calculate strain rate, especially when fracture mechanics analysis is the focus of study. Those who present approaches to assess the values of strain rate usually consider a constant value for each test. In this paper, a numerical approach is proposed to assess the strain rate in modes I and II in double cantilever beam and end notch flexure tests, respectively. The results of this study demonstrate that the strain rate in the adhesive bondline along the crack propagation in the double cantilever beam and end notch flexure tests is not constant when loaded at a constant cross-head speed. This finding also helps to justify why experimental R-curves of double cantilever beam tests, when loaded at speeds above quasi-static conditions, do not have a perfect plateau contrasting with those, usually presented by numerical simulations, that do not take into account the effect of the strain rate.

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Method to Address Brittle Rock Strength Scatter Through Fracture Density

Wang

2019

Rock Mech Rock Eng

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Measuring the critical energy release rate in mode II of tough, structural adhesive joints using the tapered end-notched flexure (TENF) test

Cited by 23 publications

References 3 publications

A strain rate dependent cohesive zone element for mode I modeling of the fracture behavior of adhesives

A strain rate dependent cohesive zone element for mode I modeling of the fracture behavior of adhesives

Numerical assessment of strain rate in an adhesive layer throughout double cantilever beam and end notch flexure tests

Method to Address Brittle Rock Strength Scatter Through Fracture Density

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