Elasto-plastic stress distributions in adhesively bonded double lap joints

Sayman, Onur; Özen, Mustafa; Korkmaz, Behiye

doi:10.1016/j.matdes.2012.09.005

Cited by 18 publications

(6 citation statements)

References 18 publications

(17 reference statements)

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“…Table 1 lists the material parameters in Abaqus/CAE, and the load (F) was 0.5 kN. According to the models proposed by Sayman et al (2013) and Vaidya et al (2008), the adhesive layer and adherend are regarded as isotropic elastoplastic materials. In finite element analysis, it is assumed that connections of structural components are perfect, the bonding surface is defect-free, no spew fillets are present on joint ends, displacements of coupling nodes are consistent, and the bonding interface is perfectly bonded.…”

Section: Construction Of the Finite Element Modelmentioning

confidence: 99%

“…Hence, the stability of strap lap bonding joints is typically poor. Although mechanical properties (e.g., strength) of strap lap bonding joints can be experimentally determined (Osnes and McGeorge 2005;Wang and Gunnion 2009;Sayman et al 2013), their structural stress distribution cannot be tested or described. Currently, stress distributions in bonding joints can be numerically simulated by the finite element method, thus facilitating mechanical analysis for the design of complicated adhesive structures (Vaidya et al 2008;Lu et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Finite element analysis of strap lap bonding joints for wood powder/polyethylene composites with combined surface treatment

Zhou

2020

BioRes

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A design for strap lap bond joints of wood powder/polyethylene composites (WP/PE) was proposed. The effects of combined treatment on surface properties of WP/PE and failure modes of WP/PE bonded by epoxy and acrylic ester were investigated. A finite element model of strap lap bond joints of WP/PE was established based on the elastoplasticity finite element method, and the effects of lap length and adhesive (epoxy and acrylic ester) on stress distributions and comprehensive displacements of strap lap bond joints of WP/PE were investigated. The results demonstrated that the bonding interface roughness of WP/PE was enhanced by the combined surface treatment. Active oxygen-containing functional groups were introduced to the sample surface. The finite element simulation results revealed that the Mises equivalent stress peaks and comprehensive displacements of strap lap bond joints were concentrated in lap zone ends and board connections, the stress distribution was independent of the lap length, and the Mises equivalent stress peaks and comprehensive displacements were independent of the adhesive.

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Section: Construction Of the Finite Element Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Finite element analysis of strap lap bonding joints for wood powder/polyethylene composites with combined surface treatment

Zhou

2020

BioRes

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“…1 (Huang et al 2012). To simplify the model analysis, the adhesive layer and bonded specimen were defined as isotropic elastoplastic materials by using the finite element numerical simulation models of (Sayman et al 2013) and (Vaidya et al 2008). It was assumed that the bonding structure was well connected, the bonded surface had no defects, the coupling joints had the same displacement, the joints were isotropic, and the bonding degree of the adhesive interface was 100%.…”

Section: Construction Of the Finite Element Modelmentioning

confidence: 99%

Numerical simulation analyses of single lap joints for wood-PE composites formed with epoxy and acrylic ester adhesives

Zhou

2019

BioRes

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Wood powder/polyethylene composites (WP/PE) were surface treated by plasma discharge and bonded with epoxy resin and acrylic ester adhesives, respectively. The finite element model of the single lap bonded joints of WP/PE was established through the elastic-plastic finite element method, and the influences of adhesive and lap length on the stress distribution in the adhesive joints were analyzed. The results showed that polar oxygen-containing groups were introduced to the WP/PE surface with the plasma treatment, which improved the bonding properties. The peak values of Mises equivalent stress, peel stress, and shear stress of the bonded joints were mainly concentrated at the end of the bond joint. The peak values of the stress in the lap zone of the high-modulus epoxy resin-bonded joints were higher than those of the low-modulus acrylic ester-bonded joints. With an increased length of the joints, the Mises equivalent stress peak value at the end increased slightly, the peeling stress peak value decreased slightly, and the shear stress peak value changed little. The elastic modulus of the adhesive had a great influence on the stress distribution, and the change in the lap length was not remarkable enough to improve the stress distribution of the adhesive joint.

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“…These could be classified into three groups (Ihn and Chang, 2008): the first group includes localized problems such as cracks, voids or delamination; the second group includes damages related to the adhesive mechanical properties (cohesive problem); the third one is related to adhesive problems and so to the strength of the adhesion between adhesive and adherend. In He (2014) and Sayman et al (2013), it was demonstrated that the stress distributions of a single-lap adhesively bonded joint are affected by the boundary conditions and the stress concentrations are high only at interface free-ends (the central region of adhesive layer is almost stress-free). For these reasons, the free-ends of adhesive regions can be subjected to interfacial fracture due to either the normal or the shear stress or their combination exceeding the bond strength.…”

Section: Introductionmentioning

confidence: 99%

Non-linear Lamb Waves for Locating Defects in Single-Lap Joints

Nicassio

Carrino

Scarselli

2020

Front. Built Environ.

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A novel method based on Non-linear Lamb waves behavior and Local Defect Resonance (LDR) is proposed for locating and evaluating disbonds in Single-Lap Joints (SLJ) typically used in aerospace industry. The presence of damages/defects such as disbonds leads to the presence of sub-and super-harmonics components in the frequency response. The maximum acoustic wave-damage interaction is reached by particular excitation frequencies that enhance the Non-linear response causing LDR. The LDR frequency is experimentally evaluated through the appearance of a single subharmonic component in the frequency spectrum of signals received by piezoelectric transducer (PZT) bonded on the structure. The Non-linear properties of Lamb waves are exploited to make defects generate subharmonic waves at LDR frequency. An algorithm is implemented for damage/defect localization that is accurately obtained by knowing PZTs positions, Time of Flight (ToF) and propagation properties of subharmonics packet. Several disbonds with different dimensions are artificially reproduced on an aluminum SLJ: experimental and FE results show good accordance both in usual (single damage) and critical (multi-damage) scenario. The paper proposes a baseline-free method for the disbonds detection, characterization and localization in SLJs that uses the PZT signals without affecting adhesive interface, thus allowing for an active health monitoring.

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Elasto-plastic stress distributions in adhesively bonded double lap joints

Cited by 18 publications

References 18 publications

Finite element analysis of strap lap bonding joints for wood powder/polyethylene composites with combined surface treatment

Finite element analysis of strap lap bonding joints for wood powder/polyethylene composites with combined surface treatment

Numerical simulation analyses of single lap joints for wood-PE composites formed with epoxy and acrylic ester adhesives

Non-linear Lamb Waves for Locating Defects in Single-Lap Joints

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