Measurement of epoxy film adhesive properties in torsion and tension using tubular butt joints

Kosmann, Jens; Klapp, Oliver; Holzhüter, Dirk; Schollerer, Martin; Fiedler, Arne; Nagel, Christoph; Hühne, Christian

doi:10.1016/j.ijadhadh.2018.02.020

Cited by 17 publications

(24 citation statements)

References 4 publications

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“…The adhesive is an epoxy‐based, single‐component, hot curing system. From literature, an Young's modulus of 2205 MPa and Poisson's ratio of 0.36 are to be expected 5 . The geometry of joints is described in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

“…The degree of stress multiaxiality is a measure of the fraction of hydrostatic stresses, which influence the strength of adhesive joints. Measuring the degree of multiaxiality by Equation 12 and setting ν = 0.36 5 results in Π = 1.50 for butt joints, Π = 0.89 for scarf joints, and Π = 0 for TAST joints.…”

Section: Methodsmentioning

confidence: 99%

“…From literature, an Young's modulus of 2205 MPa and Poisson's ratio of 0.36 are to be expected. 5 The geometry of joints is described in Figure 1. The adherends were made of S235 steel.…”

Section: F I G U R E 1 Geometry Of Bondedmentioning

confidence: 99%

“…In terms of design, fatigue loading conditions are commonly found in the service operation of aircraft structures 4 . An additional complexity when dealing with fatigue is related to the presence of multiaxial stresses, which can occur due to multiaxial loads (e.g., tension/torsion) 5 or due to constraining of stiff adherends 6 . In the case of adhesives, that is, polymer‐based materials, multiaxiality can be associated with high levels of hydrostatic stresses, 7,8 which have a substantial effect on the failure mechanism of these materials 9–12 …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fatigue failure criteria for structural film adhesive bonded joints with considerations of multiaxiality, mean stress and temperature

Beber

Baumert

Klapp

et al. 2020

Fatigue Fract Eng Mat Struct

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Fatigue failure criteria for structural film adhesive joints considering multiaxiality, mean stress and temperature effects were investigated. Multiaxiality was addressed by testing butt, scarf and thick adherend shear test joints. Mean stress effect was evaluated under stress ratios of −1.0 and 0.1, and the temperature assessed at −55°C, RT and +100°C. Fatigue results were assessed using three fatigue criteria: (1) maximum principal stress, (2) linear Drucker‐Prager stress or (3) Findley's critical plane. All criteria worked well on fitting the multiaxial fatigue behaviour of joints with criteria (2) and (3) performing slightly better. However, criterion (1) is parameter‐free, which avoids data fitting. Mean stress effect was successfully described based on a Haigh transformation. Temperature effect was characterised using the criterion (1), which was capable of combining fatigue data at different temperatures. An increase of temperature led to fatigue strength reduction, meaning that a knock‐down factor approach could be used.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…From literature, an Young's modulus of 2205 MPa and Poisson's ratio of 0.36 are to be expected. 5 The geometry of joints is described in Figure 1. The adherends were made of S235 steel.…”

Section: F I G U R E 1 Geometry Of Bondedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fatigue failure criteria for structural film adhesive bonded joints with considerations of multiaxiality, mean stress and temperature

Beber

Baumert

Klapp

et al. 2020

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Accompanied by digital image correlation (DIC), Kosmann describes in Kosmann et al. 12,13 the specimens strain is made visible and quantified. Also a crosscheck about strain and stress peaks of FEA and tests were done.…”

Section: Surface Tougheningmentioning

confidence: 99%

Surface toughening – An industrial approach to increase the robustness of pure adhesive joints with film adhesives

Schollerer

Kosmann

Holzhüter

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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Bonding is known for its wide range of advantages over bolted joints when joining different materials together. However, the advantages e.g. of homogeneous load distribution can quickly be lost in case of overload. For this reason, the load occurring in the adhesive is reduced by constructive measures far below the yield stress of the adhesive, which leads to a conservative joint design. And to be on the safe side, a few “chicken rivets” are then placed again. This problem is particularly well known in aviation. Highly loaded components are structurally bonded by a combination of rivets and adhesive in order to underline the advantages of structural adhesive bonding with the safety of the well-known bolted joints. Known as fail-safe design, this concept is damage tolerant and more robust against manufacturing defects through a secured double load path. Especially when joining fiber-reinforced composites, bolts weaken the adherends of the joint and only contribute to load transfer when the brittle adhesive fails. With the help of Surface Toughening, a boltless technique for reducing stress concentrations and arresting cracks in adhesive bonded joints is available. This work describes the industrial application of this technique. Starting with coupon tests and a small scale demonstrator to ensure the compatibility with industrial manufacturing processes, such as infusion and prepreg manufacturing, a large scale demonstrator of a 2 m carbon fiber reinforced plastic (CFRP) - HTP leading edge with hybrid laminar flow control is manufactured by the industrial partner AERnnova. Verifying a simple and cost-effective application of the technology, Surface Toughening enables robust bonded joints with a minimum impact on today's process of adhesive bonding.

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Investigation of exact analytical solutions for circular notched composite laminates under tensile loading

Koord

Stüven

Petersen

et al. 2020

Composite Structures

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Measurement of epoxy film adhesive properties in torsion and tension using tubular butt joints

Cited by 17 publications

References 4 publications

Fatigue failure criteria for structural film adhesive bonded joints with considerations of multiaxiality, mean stress and temperature

Fatigue failure criteria for structural film adhesive bonded joints with considerations of multiaxiality, mean stress and temperature

Surface toughening – An industrial approach to increase the robustness of pure adhesive joints with film adhesives

Investigation of exact analytical solutions for circular notched composite laminates under tensile loading

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