The mechanical performance of adhesive joints containing active disbonding agents

2013 ◽  
Vol 46 ◽  
pp. 100-113 ◽  
Author(s):  
R.H. McCurdy ◽  
A.R. Hutchinson ◽  
P.H. Winfield
Keyword(s):  
Mechanical Performance ◽  
Adhesive Joints

scholarly journals The Mechanical Performance of Re-Bonded and Healed Adhesive Joints Activable through Induction Heating Systems

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6351
Author(s):  
Raffaele Ciardiello
Keyword(s):  
Mechanical Properties ◽  
Electromagnetic Field ◽  
Induction Heating ◽  
Mechanical Performance ◽  
Joint Stiffness ◽  
Fatigue Tests ◽  
Adhesive Joints ◽  
Lap Joint ◽  
Heating Systems ◽  
Maximum Shear Strength

This work aims to study the healing potential properties of a reversible thermoplastic adhesive. The adhesive is activable by using induction heating systems that can induce thermal heat in the particles throughout the electromagnetic field so they can melt the adhesive for bonding or separation procedures. The healing procedure consists of damaging single lap joint (SLJ) specimens with quasi-static and fatigue tests and then using an inductor to generate an electromagnetic field able to heat the adhesive to its melting point in order to heal the damaged SLJ specimens. SLJ tests were performed on damaged and healed specimens to assess, respectively, the residual mechanical properties of the damaged specimens and the mechanical properties after healing. SLJ tests showed that the healing procedure can completely recover the joint stiffness of the damaged adhesive joints, a huge part of the maximum shear strength and the SLJ absorbed energy. This work shows also the possibility of re-bonding completely failed or separated SLJs by using the same procedure. The mechanical properties of SLJs after healing and re-bonding are compared to the SLJ compared on virgin specimens to assess the recovered mechanical properties.

scholarly journals Effect of nylon fabric reinforcement on the mechanical performance of adhesive joints made between glass and GFRP

2021 ◽  
Vol 16 (59) ◽  
pp. 89-104
Author(s):  
Placido Munafò ◽  
Francesco Marchione ◽  
Gianluca Chiappini ◽  
Monica Marchini
Keyword(s):  
Mechanical Performance ◽  
Joint Stiffness ◽  
Adhesive Layer ◽  
Tensile Tests ◽  
Nylon 6 ◽  
Float Glass ◽  
Adhesive Joints ◽  
Fabric Reinforcement ◽  
Reinforcement System ◽  
Nylon Fabric

The use of reinforcements in adhesive joints makes the stress distribution more uniform, improving their mechanical performance and adhesion. The present paper aims to verify the effectiveness and efficiency of the insertion of nylon 6 fabric in the adhesive layer, to study their applicability and functionality in building components. The increase in stiffness achieved by applying nylon 6 fabric in the adhesive layer between glass and GFRP pultruded profiles and steel laminates applied to GFRP beams is investigated. Three different epoxy adhesives and one epoxy resin are used and compared. Three different types of tests are carried out in order to study the different properties of the reinforcement system: tensile tests on GFRP/GFRP single-lap adhesive joints, with and without nylon fabric reinforcement; tensile tests on double-lap adhesive joints between float glass and pultruded GFRP profiles reinforced with nylon fabric according to four configurations (in the middle plane of the adhesive layer, on the glass surfaces, on the GFRP surfaces, on both GFRP and glass configurations) to verify the influence of its position; three-point bending tests on long GFRP tubular profiles reinforced with steel plates and nylon fabric in different configurations, to study resistance to bending loads. The results from the experimental campaign show the effectiveness of the reinforcement system using nylon fabric 6. In general, both a reduction in ultimate strength and an increase in joint stiffness compared to unreinforced configurations are observed.

scholarly journals Mechanical Performance Enhancement of Aluminum Single-Lap Adhesive Joints Due to Organized Alumina Nanotubes Layer Formation on the Aluminum Adherends

Applied Nano ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 206-221
Author(s):  
George C. Papanicolaou ◽  
Lykourgos C. Kontaxis ◽  
Diana V. Portan ◽  
Grigoris N. Petropoulos ◽  
Eleni Valeriou ◽  
...  
Keyword(s):  
Electrochemical Method ◽  
Mechanical Response ◽  
Bending Strength ◽  
Performance Enhancement ◽  
Mechanical Performance ◽  
Industrial Applications ◽  
Adhesive Joints ◽  
Aluminum Surface ◽  
Strength Increase ◽  
Three Point Bending

The present investigation aims to take a step forward for the transfer of a simple laboratory electrochemical method of surface nano-treatment of aluminum to industrial applications. The electrochemical method has been applied to process 1050A aluminum. Surface nano-structuring has been achieved and resulted in the formation of an organized alumina nanotubes layer on commercial aluminum plates used as adherends for the manufacturing of aluminum single-lap adhesive joints. The mechanical properties of single-lap aluminum adhesive joints constructed with both non-anodized and anodized adherends were investigated and compared. Two types of epoxy resins were used to prove that the anodization of the adherends is equally effective, independently of the adhesives’ type. Furthermore, three overlap lengths were used (7, 10, and 25 mm) to study the effect of the overlap length on the overall joint mechanical response. Results of both three-point bending and tensile–shear testing showed that there is a considerable improvement of the joints’ mechanical performance with the addition of the nanostructures, for all the overlap lengths. It was found that the anodization method greatly contributes to the strengthening of the joints, leading to a strength increase of up to 176% and 148% for the shear and three-point bending strength, respectively.

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