Peel strength characterisation on ply/ply interface using wedge and T-peel/pull-type tests

Satheesh, Britto; Tonejc, Maximilian; Potakowskyj, Larissa; Pletz, Martin; Fauster, Ewald; Kaynak, Baris; Schledjewski, Ralf

doi:10.1177/0967391118809205

Cited by 9 publications

(3 citation statements)

References 40 publications

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“…As per the standards, the maximum loading rate must fall between 15% and 85% of the upper limit of the loading range [33]. The peel speed also affects the peel-off strength of the polymer composites [36]. Similar to the tensile test, the T-peel off test was conducted.…”

Section: Experimentationsmentioning

confidence: 99%

Comparative study on the influence of additives on interfacial adhesion strength between fibres and extruded polymer core via peel-off test

Balan,

Aravind Raj

2024

Mater. Res. Express

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Various peel-off experiments can be used to determine the adhesion strength of various fibres. Among them was the "T" type peel-off test, which measures the adhesions between fibres. The use of organic and inorganic fillers in flake or powder form will alter the adhesive properties of the binders as well as the adhesive strength between the fibres. In this study, the adhesion strength between three different varieties of glass fibres (C-Glass, E-Glass, and S-Glass fibres) with a PLA core has been investigated. As a binder, an epoxy resin was used, and the resin was modified with inorganic additives such as alumina, bentonite, and silicon carbide. Peel-off testing was used to examine the effect of additives on the bonding strength between a thermoplastic core and a synthetic fibre. The addition of inorganic compounds was found to reduce the adhesion strength between the fibres and the core. In order to evaluate the initial adhesion between the filaments and the core, nine specimens were fabricated without the addition of any additives and their strengths were determined. Maximum adhesion strength of 71.8 MPa was recorded for the neat resin. The adhesive strength after inclusion of additives was observed to decrease by 18.14%, and recorded maximum peel-off strength of 58.2 MPa. Also, the inclusion percentages of the additives were found to be the most influential factor in determining the composites' adhesive properties. Validation tests were also conducted with the optimized results which demonstrated that the predicted and experimental results were in excellent agreement. Macro and micro approaches were employed to analyze the deformation mechanisms in order to gain a comprehensive understanding of how the additives affected the adhesion strength.

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Section: Experimentationsmentioning

confidence: 99%

Comparative study on the influence of additives on interfacial adhesion strength between fibres and extruded polymer core via peel-off test

Balan,

Aravind Raj

2024

Mater. Res. Express

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“…Rigid-rigid material combinations include structures of welded thermoplastic composites, [94][95][96] hybrid structures consisting of a composite reinforced metal substrate [97][98][99][100][101] as well as adhesively bonded metals. 102,103 Flexible-rigid combinations include the combination of an adhesive on a rigid, typically metal substrate 104 or a thin layer on a thicker substrate, such as coatings [105][106][107] or printed circuit boards.…”

Section: Peel Testsmentioning

confidence: 99%

A review of mode I dominant interfacial fracture toughness test methods of skin-core bonding for thermoplastic composite sandwich structures

Weidmann

Ziegmann

Wieser³

2022

Journal of Thermoplastic Composite Materials

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Increased lightweight design via composite sandwich structures is a promising approach due to their exceptionally high weight-specific mechanical properties. The involved high cost when using sandwich composite structures has hindered applications in cost-sensitive markets up to now. However, full thermoplastic composite sandwich structures enable a cost reduction using novel processing routes based on fusion bonding of core and facesheet. In order to optimize such full thermoplastic composite sandwich structures and to ensure proper bonding of facesheet and core after manufacture, valid test methods for the quantification of skin-core interfacial bonding are required. This paper reviews existing test methods for the determination of Mode I dominant interfacial fracture toughness of sandwich structures. The main focus is set on cantilever beam tests as well as on peel tests. Based on a definition of requirements for suitable test methods, their applicability for full thermoplastic composite sandwich structures is evaluated. The Mandrel Peel Test results as most promising test method for thermoplastic sandwich structures, especially with thin facesheets.

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“…8 Alternatives to them include rapid screening tests such as peel tests and lap shear tests, which can be used to evaluate the quality of bonding for thermoplastic composites. The peel testing is used to assess bonding, such as wedge peel, 6,[9][10][11] T-peel, 12 and mandrel peel. [13][14][15] These test methods can characterize the fracture toughness of the interface between the prepreg tapes, but the material properties affect the fracture toughness, thus, investigating the interrelation between processing parameters and material properties is not effortless.…”

Section: Introductionmentioning

confidence: 99%

Investigation of analysis and improvement of the assessment of bonding performance for thermoplastic composites

Liu

Huan

et al. 2022

Journal of Thermoplastic Composite Materials

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A lap shear test is employed to evaluate the interfacial bonding strength between unidirectional CF/PEEK tapes as quantification of bonding quality. In this study, a novel tab is proposed to ameliorate bonding testing. The crucial role of developed tabs is to avoid the adherend fracture that is typically observed in specimens with conventional tabs. Specimens with different tab, bonding processes, and lap lengths are prepared and tested. Moreover, theoretical analysis is conducted to predict bonding strength, and finite element simulations are also performed for stress distribution in these specimens with different types of tabs. The experimental and theoretical results demonstrate that the full tab is employed in the bonding test, the stress concentration reduces nearly by 6 times, and the failure mode coincides with the expected requirement. Additionally, the highest estimation of bonding strength increases nearly by 69%, and is approximately consistent with the theoretical calculation, up to 98.6%. This tab configuration, with low dependence on processes and joint parameters, describes a straightforward and efficient procedure to meliorate the quantification of the bonding strength, and is found to be applicable in the tape placement process and single-lap-joint assemblies for thermoplastic composites.

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Peel strength characterisation on ply/ply interface using wedge and T-peel/pull-type tests

Cited by 9 publications

References 40 publications

Comparative study on the influence of additives on interfacial adhesion strength between fibres and extruded polymer core via peel-off test

Comparative study on the influence of additives on interfacial adhesion strength between fibres and extruded polymer core via peel-off test

A review of mode I dominant interfacial fracture toughness test methods of skin-core bonding for thermoplastic composite sandwich structures

Investigation of analysis and improvement of the assessment of bonding performance for thermoplastic composites

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