Environment influence on the solidity of the adhesive joint

In this paper “Environment influence on the solidity of the adhesive joint” I have dealt with the utilization of the bonding metals and practising experimental laboratory tests of adhesive joints depending on different laboratory environments and anticorrosive protection of the samples.For this laboratory tests I have chosen a universal adhesive. It is a two-component epoxy adhesive with suitable conditions for bonding metals. The samples were made from steel and were produced by the standard ČSN EN 1465. After the bonding and the cure procedure the samples were exposed in H20 environment for exact intervals (parts of the samples were painted by anticorrosive painting). After the exposition I have examinated the solidity of the adhesive joint in shearing stress on the measuring instrument Zwick 050. The samples were compared with etalon that were exposed to no environment.Results of the particular measuring were described into the graphs and were recorded the break down maximum force. When the samples were broken down I have taken a photo of it, which is in the appendix.

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Fatigue Performance of Hybrid Adhesive Dissimilar Joint

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.786.48 ◽

2015 ◽

Vol 786 ◽

pp. 48-52 ◽

Cited By ~ 1

Author(s):

Ku Hafizan ◽

Mohd Afendi ◽

A. Logashanmugam

Keyword(s):

Fatigue Life ◽

Stress Reduction ◽

Adhesive Joint ◽

High Performance ◽

Research Study ◽

Epoxy Adhesive ◽

Adhesive Joints ◽

Fatigue Performance ◽

Stainless Steel 304 ◽

Adhesive Thickness

A research study on the fatigue performance of hybrid adhesive joints was carried out to investigate the fatigue performance of adhesive joint and hybrid adhesive joint using dissimilar material. A 3 mm thin plate of aluminium A7075 and stainless steel 304 are used as the adherend material for experimental test and the adhesive used was high performance Araldite epoxy adhesive. Maximum fatigue life was achieved for the hybrid adhesive joint with an optimum overlap length of 59 mm and the adhesive thickness of 0.2 mm. The fatigue damaged occurs on the adherend surface for adhesive joint and adherend crack for hybrid adhesive joint. Results showed an increment of fatigue life with shear stress reduction.

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Technical Evaluation of Structural Adhesive Joints under Adverse Operation Conditions

Materials Science Forum ◽

10.4028/www.scientific.net/msf.797.169 ◽

2014 ◽

Vol 797 ◽

pp. 169-174

Author(s):

José M. Arenas Reina ◽

Rosa Ocaña López ◽

Cristina Alía García ◽

Julián J. Narbón Prieto

Keyword(s):

Mechanical Properties ◽

Adhesive Joint ◽

Epoxy Adhesive ◽

Adhesive Joints ◽

Accelerated Ageing ◽

Motor Oil ◽

Aluminum Composite ◽

Operation Conditions ◽

Structural Adhesive ◽

Better Than

This work analyzes the degradation of aluminum-composite adhesive joints under the action of water and motor oil. For this purpose, we have performed an accelerated ageing of the adhesive joint by immersion in water and oil. Likewise, we have evaluated the loss of mechanical properties that aging causes into adhesive joint. First, tests have been performed with bulk adhesive specimens (epoxy and polyurethane) immersed in water and motor oil during independent periods of time (1 at 128 days) in order to study the diffusion of water and motor oil into the adhesive. Second, we have evaluated the loss of mechanical properties that aging causes in the adhesive joint. Tests conclusions show that water degrades the adhesive more than motor oil. Additionally and under the action of water and motor oil, polyurethane adhesive joints retain their mechanical properties better than epoxy adhesive joints.

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Strengthening and repairing of engineered bamboo-steel epoxy adhesive joints with carbon nanotube on the basis of resin pre-coating method

European Journal of Wood and Wood Products ◽

10.1007/s00107-020-01512-1 ◽

2020 ◽

Author(s):

Wen Liu ◽

Hang Xu ◽

Xiaozhi Hu ◽

Bingyan Yuan ◽

Bo Tan ◽

...

Keyword(s):

Carbon Nanotube ◽

Epoxy Adhesive ◽

Adhesive Joints ◽

Coating Method

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Apparent Young’s Modulus of the Adhesive in Numerical Modeling of Adhesive Joints

Materials ◽

10.3390/ma14020328 ◽

2021 ◽

Vol 14 (2) ◽

pp. 328

Author(s):

Kamil Anasiewicz ◽

Józef Kuczmaszewski

Keyword(s):

Numerical Model ◽

Young’S Modulus ◽

Adhesive Joint ◽

Young's Modulus ◽

Precise Determination ◽

Adhesive Joints ◽

Experimental Conditions ◽

Element Simulation ◽

Joint Material

This article is an evaluation of the phenomena occurring in adhesive joints during curing and their consequences. Considering changes in the values of Young’s modulus distributed along the joint thickness, and potential changes in adhesive strength in the cured state, the use of a numerical model may make it possible to improve finite element simulation effects and bring their results closer to experimental data. The results of a tensile test of a double overlap adhesive joint sample, performed using an extensometer, are presented. This test allowed for the precise determination of the shear modulus G of the cured adhesive under experimental conditions. Then, on the basis of the research carried out so far, a numerical model was built, taking the differences observed in the properties of the joint material into account. The stress distribution in a three-zone adhesive joint was analyzed in comparison to the standard numerical model in which the adhesive in the joint was treated as isotropic. It is proposed that a joint model with three-zones, differing in the Young’s modulus values, is more accurate for mapping the experimental results.

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Mixed-mode fatigue behavior of degraded toughened epoxy adhesive joints

International Journal of Adhesion and Adhesives ◽

10.1016/j.ijadhadh.2010.11.007 ◽

2011 ◽

Vol 31 (2) ◽

pp. 88-96 ◽

Cited By ~ 31

Author(s):

N.V. Datla ◽

J. Ulicny ◽

B. Carlson ◽

M. Papini ◽

J.K. Spelt

Keyword(s):

Mixed Mode ◽

Fatigue Behavior ◽

Epoxy Adhesive ◽

Adhesive Joints ◽

Toughened Epoxy

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Adhesives in engineering

Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering ◽

10.1243/0954410971532703 ◽

1997 ◽

Vol 211 (5) ◽

pp. 307-335 ◽

Cited By ~ 63

Author(s):

A J Kinloch

Keyword(s):

Molecular Weight ◽

Fracture Mechanics ◽

Service Life ◽

Adhesive Joint ◽

Adhesive Joints ◽

Liquid Form ◽

Engineering Applications ◽

Advantages And Disadvantages ◽

Load Carrying ◽

Made In

When considering methods for joining materials, there are many advantages that engineering adhesives can offer, compared to the more traditional methods of joining such as bolting, brazing, welding, mechanical fasteners, etc. The advantages and disadvantages of using engineering adhesives are discussed and it is shown that it is possible to identify three distinct stages in the formation of an adhesive joint. Firstly, the adhesive initially has to be in a ‘liquid’ form so that it can readily spread over and make intimate molecular contact with the substrates. Secondly, in order for the joint to bear the loads that will be applied to it during its service life, the ‘liquid’ adhesive must now harden. In the case of adhesives used in engineering applications, the adhesive is often initially in the form of a ‘liquid’ monomer which polymerizes to give a high molecular weight polymeric adhesive. Thirdly, it must be appreciated that the load-carrying ability of the joint, and how long it will actually last, are affected by: (a) the design of the joint, (b) the manner in which loads are applied to it and (c) the environment that the joint encounters during its service life. Thus, to understand the science involved and to succeed in further developing the technology, the skills and knowledge from many different disciplines are required. Indeed, the input from surface chemists, polymer chemists and physicists, materials engineers and mechanical engineers are needed. Hence, the science and technology of adhesion and adhesives is a truly multidisciplined subject. These different disciplines have been brought together by developing a fracture mechanics approach to the failure of adhesive joints. The advances that have been made in applying the concepts of fracture mechanics to adhesive joints have enabled a better understanding of the fundamental aspects of adhesion and the more rapid extension of adhesives technology into advanced engineering applications.

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NON-DESTRUCTIVE EVALUATION OF MECHANICAL DAMAGE OF ADHESIVES USING MAGNETO-ELECTRIC NANOPARTICLES

10.12783/asc36/35763 ◽

2021 ◽

Author(s):

GONZALO SEISDEDOS ◽

BRIAN HERNANDEZ ◽

JULIETTE DUBON ◽

MARIANA ONTIVEROS ◽

BENJAMIN BOESL ◽

...

Keyword(s):

Adhesive Joint ◽

Adhesive Bonding ◽

Mechanical Damage ◽

Adhesive Bond ◽

Tensile Tests ◽

Adhesive Joints ◽

Adhesive Bonds ◽

Magnetic Signatures ◽

Looper System ◽

Lock In

Adhesive bonding has been shown to successfully address some of the main problems with traditional fasteners, such as the reduction of the overall weight and a more uniformly distributed stress state. However, due to the unpredictability of failure of adhesive bonds, their use is not widely accepted in the aerospace industry. Unlike traditional fastening methods, it is difficult to inspect the health of an adhesive joint once it has been cured. For adhesive bonding to be widely accepted and implemented, there must be a better understanding of the fracture mechanism of the adhesive joints, as well as a way to monitor the health of the bonds nondestructively. Therefore, in-field structural health monitoring is an important tool to ensure optimal condition of the bond is present during its lifetime. This project focuses on the advancement of a non-invasive field instrument for evaluation of the health of the adhesive joints. The tool developed is based on a B-H looper system where coils are arranged into a noise-cancellation configuration to measure the magnetic susceptibility of the samples with a lock-in amplifier. The B-H looper system can evaluate the state of damage in an adhesive bond by detecting changes in surface charge density at the molecular level of an epoxy-based adhesive doped with magneto-electric nanoparticles (MENs). Epoxy-based adhesive samples were doped with MENs and then scanned using the B-H looper system. To evaluate the health of the adhesive joint, microindentation and tensile tests were performed on MENs-doped adhesive samples to understand the relationship between mechanical damage and magnetic signal. Correlations between magnetic signatures and mechanical damage were minimally observed, thus future studies will focus on refining the procedure and damaging methodology.

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