Analytical stiffness analysis of adhesively bonded single-lap joints subjected to out-of-plane deflection due to tensile loading

Joining dissimilar materials to achieve lightweight design and energy efficiency has been increasingly popular. A joint formed by components of particle-reinforced metal and polymer matrix composite combines the merits of both materials. This paper is mainly focused on the research of the tensile lap shear and impact behavior of the dissimilar single-lap joints (SLJs) between SiCp/AA2124 composite and glass fiber-reinforced polypropylene (PP). The effects of out-of-plane loading applied from different surfaces of SLJs on impact responses are evaluated. Hot pressing technique is introduced to manufacture metal/polymer assembly without using any adhesive. The hole drilling effect is investigated with the idea that it may provide weight reduction and also increase the strength of the dissimilar SLJs. The results indicate that the dissimilar SLJs show more Charpy impact strength when the impact is performed on the metal-matrix composite (MMC). Mechanical properties of SLJs are adversely affected by a drilled hole in the MMC adherend.

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The impact of graphene nanoparticle additives on the strength of simple and hybrid adhesively bonded joints

Journal of Composite Materials ◽

10.1177/0021998318817588 ◽

2018 ◽

Vol 53 (23) ◽

pp. 3335-3346 ◽

Cited By ~ 2

Author(s):

Hamid Reza Borghei ◽

Bashir Behjat ◽

Mojtaba Yazdani

Keyword(s):

Joint Strength ◽

Tensile Tests ◽

Lap Joints ◽

Homogeneous Distribution ◽

Adhesively Bonded ◽

Adhesively Bonded Joints ◽

Single Lap Joints ◽

Hybrid Joints ◽

Graphene Nanoparticles ◽

The Impact

In this paper, the effect of graphene nanoparticle additive on the strength of simple and hybrid (rivet-bonded) single-lap joints is studied using the experimental method. Two different types of graphene with different number of layer and thicknesses are used in adhesive-graphene nanoparticle composite construction. At first, tensile tests are done on bulk specimens of adhesive with different additives. It is found that adding 0.5 wt% of graphene to the neat adhesive leads to an increase in the ultimate tensile strength of bulk specimens almost 24% and 12% for two graphene types compared to the neat adhesive. Also, the shear strength of adhesive and hybrid lap joints incorporating two types of graphene nanoparticles (types I and II) is compared to that of adhesive and hybrid joints without graphene nanoparticles. SEM results of fracture surfaces show that the inclusion of graphene nanoparticle to the adhesive increases the roughness of surfaces. Experimental results reveal that graphene nanoparticle increases the strength of bonded and hybrid joints. It is observed that, graphene with a lower thickness and number of layers has a better influence on joint strength. In fact, graphene nanoparticle type II makes a homogeneous distribution in adhesive-graphene nanoparticle composite and causes a significant increase on joint strength.

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The Effect of Nanoparticles in Single Lap Joints Studied by Numerical Analyses

European Journal of Engineering Research and Science ◽

10.24018/ejers.2020.5.10.2194 ◽

2020 ◽

Vol 5 (10) ◽

pp. 1288-1293

Author(s):

Panagiotis J. Charitidis

Keyword(s):

Finite Element ◽

Failure Load ◽

Tensile Loading ◽

Lap Joints ◽

Von Mises Stress ◽

Adhesive Material ◽

Element Analysis ◽

Single Lap Joints ◽

Epoxy Adhesives ◽

Von Mises

The present study concerns with the finite element investigation of balanced aluminium single lap joints subjected to tensile loading. Epoxy adhesives were used for bonding having different nanoparticles rate in the epoxy resin (0.5, 1.0, 1.5 and to 2 wt. %, respectively). Two-dimensional (2D) finite element analysis has been employed to determine the peeling stress, von Mises stress, and the shear strain distribution across the midplane of the joints. The results mainly prove that the nanoparticles rate in the adhesive material directly affects the joint tensile strength. Nanocomposite adhesives present a higher failure load than that of neat adhesives. Furthermore, nanocomposite adhesive with 0.5 wt. % of nanoparticles generated strengths (shear and peeling strengths) more than neat adhesives, after which decreased by further addition of the nanoparticles.

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