An experimental investigation on the failure loads of the mono and bi-adhesive joints

Öz, Özkan; Özer, Halil

doi:10.1080/01694243.2016.1264661

Cited by 35 publications

(7 citation statements)

References 32 publications

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“…Therefore, Single-lap joints have received considerably more attention by researchers to develop novel approaches to reduce stresses at the ends of overlap. Several techniques have been suggested [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] to increase the overall strength of the SLJ that can be categorised into two major groups: geometrical and material modifications.…”

Section: Introductionmentioning

confidence: 99%

The influence of notching and mixed-adhesives at the bonding area on the strength and stress distribution of dissimilar single-lap joints

Kanani

Hou

2020

Composite Structures

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With the rapid development of new engineering materials, multi-material structures are now widely used to achieve desired performances instead of conventional ones. The increased use of dissimilar adherends such as composites and metals for joining structural parts in aerospace, maritime and civil and transport structures in the past decades make it essential to find methods to improve the performance of this type of joints due to the potential for lightweight products. The first aim of this research is to minimise peak stress concentration by introducing notches in the bonding area to increase the performance of single-lap joints with epoxy adhesive. This is done by utilising the finite element method (FEA) in Abaqus ® software to model a series of single lap joints (SLJ) with various notch designs to find the optimum. Experimental tests are carried out to verify the designs.The optimal design is used then to model various SLJs with mono-adhesive and mixed-adhesives to optimise single-lap joints with dissimilar adherends. The novel geometrical modification reduces peak stresses significantly in the joints with dissimilar adherends, which leads to smaller asymmetric stress distribution along bond-line. The experimental results show significant improvement in the dissimilar joint strength. Compared with using a single material as the adhesive, it is found that using both epoxy and polyurethane as adhesive offers a higher failure load. This can be explained as the polyurethane adhesive provides more uniform stress distribution by transferring stress concentration to the interior part of the overlap length.

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Section: Introductionmentioning

confidence: 99%

The influence of notching and mixed-adhesives at the bonding area on the strength and stress distribution of dissimilar single-lap joints

Kanani

Hou

2020

Composite Structures

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“…For dissimilar adherends (metal/composite joints), the mixed joints provide a higher strength, especially in the presence of materials showing high coefficient of thermal expansion mismatch. Öz and Özer 27 carried out an experimental investigation on the failure loads of SAJ and DAJ. The study initiated by comparing the failure loads of SAJ bonded with the AV138, 2015 and 3 M DP-8005, showing that the 2015 provides the best results.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analysis of dual-adhesive stepped-lap aluminum joints

Ferreira

Campilho

Moreira

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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The use of adhesive bonds has attracted considerable interest from the scientific community. Stepped-lap joints have the advantage of decreasing stress gradients along the bond length, although the outer steps still encounter stress levels above the steps in the inner zone of the joint. One possible way to reduce this stress gradient is to combine this type of joint with the use of two adhesives. This work consists of an experimental and numerical evaluation of stepped-lap dual-adhesive joints between aluminum adherends, for various overlap lengths ( LO), and comparison with stepped-lap single-adhesive joints. The adhesives Araldite® AV138, Araldite® 2015, and Sikaforce® 7752 were evaluated. Numerically, cohesive zone models with a triangular damage law were applied in the joint behavior prediction. The analysis of the results is presented in the form of failure modes, stress analysis, damage variable analysis, load–displacement ( P–δ) curves and maximum load ( Pm), and energy required to failure ( U). It was concluded that, in general, cohesive zone model presented precise predictions. In general, no significant increase in strength was achieved with dual-adhesive joint but, on the other hand, significant energy increases were obtained.

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“…Zaeri and Googarchin 6 examined the mechanical behavior of adhesive joints under different environmental conditions and observed a decrease in the failure load with longer exposure times in an environment with higher moisture content. Öz and Özer 7 experimentally studied the effect of the bi-adhesive bondline on the failure loads and shear strengths and stated that the bi-adhesive method was more advantageous. Saraç et al.…”

Section: Introductionmentioning

confidence: 99%

Investigation of curved and scarf lap joints subjected to tensile loads using the cohesive zone model

Çitil

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this study, curved lap joints were designed, particularly for the cases in which configuration or aerodynamic design was essential. Furthermore, the effect of the surface area on their strength was investigated. Hence, curved joint types were prepared on aluminum plates (A2024-T3) that are commonly used for aviation, and an angled joint type was created by increasing the radius of curvature. The created joint types were then joined by a two-component acrylic structural adhesive (DP410). The joint models were designed in three dimensions, and a finite element analysis was performed. Cohesive zone models (bilinear, exponential, and separation-distance) based on energy principles were used in the finite element analysis to estimate the strength of the adhesively bonded joint. The mechanical properties of the materials used in the joint models were experimentally determined to obtain the numerical solutions, which were validated by further experiments. The obtained results demonstrated that there was an increase in the surface area on which the adhesive was applied as the radius of curvature of the scarf lap joints decreased; however, this had an adverse effect on the failure load that was carried.

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An experimental investigation on the failure loads of the mono and bi-adhesive joints

Cited by 35 publications

References 32 publications

The influence of notching and mixed-adhesives at the bonding area on the strength and stress distribution of dissimilar single-lap joints

The influence of notching and mixed-adhesives at the bonding area on the strength and stress distribution of dissimilar single-lap joints

Experimental and numerical analysis of dual-adhesive stepped-lap aluminum joints

Investigation of curved and scarf lap joints subjected to tensile loads using the cohesive zone model

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