Failure behaviour of the single lap joints of angle-plied composites under three point bending tests

Kadıoğlu, Ferhat; Demiral, Murat

doi:10.1080/01694243.2019.1674101

Cited by 15 publications

(8 citation statements)

References 21 publications

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“…Following the studies [11,17], the bilinear traction separation law governed the behavior of the cohesive element, where its parameters are presented in Figure 3. The initial loading part follows linear elastic behavior with the following equation:…”

Section: Mesh Sizementioning

confidence: 99%

Damage Characteristics of a Step Lap Joint Exposed to Flexural Loading for Its Different Configurations

Demiral

Kadıoğlu

2023

Polymers

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Step lap joints are kinds of lap structures, where butted laminations of each layer are consecutively offset in succeeding layers in the same direction. They are mainly designed this way to reduce the peel stresses at the edges of the overlap area observed in single lap joints. In their service, lap joints are often subjected to bending loads. However, the performance of a step lap joint under flexural loading has not been studied in the literature yet. For this purpose, 3D advanced finite-element (FE) models of the step lap joints were developed via ABAQUS-Standard. DP 460 and A2024-T3 aluminum alloy were used for the adhesive layer and adherends, respectively. The polymeric adhesive layer was modelled using cohesive zone elements with quadratic nominal stress criteria and power law interaction of the energies to characterize the damage initiation and damage evolution, respectively. A surface-to-surface contact method with a penalty algorithm and a hard contact model was used to characterize the contact between the adherends and the punch. Experimental data were used to validate the numerical model. The effects of the configuration of the step lap joint on its performance in terms of the maximum bending load and the amount of energy absorbed were analyzed in detail. A step lap joint with three steps (three-stepped lap joint) was found to show the best flexural performance, and when the overlap length at the upper and lower steps was increased, the amount of energy absorbed by the joint increased markedly.

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Section: Mesh Sizementioning

confidence: 99%

Damage Characteristics of a Step Lap Joint Exposed to Flexural Loading for Its Different Configurations

Demiral

Kadıoğlu

2023

Polymers

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“…The behavior of the aluminum adherends was represented using an elastic piecewise plastic material model whereas the epoxy/BNNS nanocomposite adhesive layer was modelled using cohesive zone elements. Cohesive zone modelling is explained extensively in the literature [29,30]. For the sake of completeness, it is described briefly as follows.…”

Section: Verification Of Materials Constantsmentioning

confidence: 99%

“…Therefore, G c 2 of adhesives with BNNSs was considered to be larger than that of the neat epoxy, 0.170 J m −2 [33]; thus, an interval, 0.170-0.5 J m −2 , for this parameter was considered in the simulations. It should be noted that, the constants for sliding (Mode 2) and tearing (Mode 3) modes were considered identical following the studies in the literature [29,30]. The material constants for Al6061 was defined from the literature [34].…”

Section: Verification Of Materials Constantsmentioning

confidence: 99%

Thermal conductivity and mechanical performance of hexagonal boron nitride nanosheets-based epoxy adhesives

et al. 2021

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Thermosets possess diverse physical and chemical properties and thus they are widely used in various applications such as electronic packaging, construction, and automotive industries. However, their poor thermal conductivity and weak mechanical performance jeopardize their continual spread in modern industry. In this study, boron nitride nanosheets (BNNSs) were employed to promote both mechanical and thermal properties of epoxy nanocomposites. BNNSs and their epoxy nanocomposites were fabricated using in situ solvent ultrasonication and in situ polymerization, respectively. Thermal conductivity was enhanced by 153% increment in epoxy/ BNNS nanocomposite at 7 wt% in comparison with neat epoxy. In parallel, Young's modulus, lap shear strength, fracture toughness (K 1C ) and energy release rate (G 1C ) increased by 69%, 31%, 122% and 118%, respectively at 1 wt% BNNSs. Moreover, fatigue life and strength of lap shear joints were significantly improved upon adding BNNSs. A numerical model of the single lap shear joint was developed to validate the accuracy of the material constants obtained. Epoxy/ BNNS nanocomposites exhibited an outstanding mechanical performance as well as high thermal conductivity giving them merits to widen their applications in electronic and automotive industry.

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“…Their ability to bond similar and dissimilar materials along with satisfactory shear properties makes them so handy for industries seeking weight-to-strength ratio optimization [1]. Moreover, regularly bonded components have shown a weak performance when subjected to peeling stress [1,2]. Therefore, numerous groups of researchers have proposed different solutions, including the step-lap joint [3,4], scarf-lap joint [5,6], spew fillet [7], and composite patch [8,9] configurations to overcome this drawback.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Performance of a Step-Lap Joint under Tensile Load: A Numerical Study

Demiral

Mamedov

2023

Polymers

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In many technical domains, adhesively bonded joints have been employed extensively. These joints perform poorly against peel stresses despite having good shear characteristics. A step-lap joint (SLJ) is one of the techniques used to reduce the peel stresses at the edges of the overlap area to avoid damages. In these joints, the butted laminations of each layer are successively offset in succeeding layers in the same direction. Bonded joints are subjected to cyclic loadings in addition to static loads. It is difficult to predict their fatigue life accurately; however, this information must be clarified to explain their failure characteristics. To this end, the fatigue response of an adhesively bonded step-lap joint subjected to tensile loading was investigated with the developed finite-element (FE) model. In the joint, toughened type DP 460 and A2024-T3 aluminium alloys were used for the adhesive layer and adherends, respectively. The cohesive zone model with static and fatigue damages were linked to each other and were used to represent the response of the adhesive layer. The model was implemented using an ABAQUS/Standard user-defined UMAT subroutine. Experiments found in the literature served as a basis for validating the numerical model. The fatigue performance of a step-lap joint for various configurations subjected to tensile loading was examined thoroughly.

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Failure behaviour of the single lap joints of angle-plied composites under three point bending tests

Cited by 15 publications

References 21 publications

Damage Characteristics of a Step Lap Joint Exposed to Flexural Loading for Its Different Configurations

Damage Characteristics of a Step Lap Joint Exposed to Flexural Loading for Its Different Configurations

Thermal conductivity and mechanical performance of hexagonal boron nitride nanosheets-based epoxy adhesives

Fatigue Performance of a Step-Lap Joint under Tensile Load: A Numerical Study

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