Showing papers in "Journal of Adhesion in 2019"
TL;DR: In this paper, the authors develop two new contact models for coupled adhesion and friction, and discuss them in the context of existing models proposed in the literature, which are able to describe sli...
Abstract: We develop two new continuum contact models for coupled adhesion and friction, and discuss them in the context of existing models proposed in the literature. Our new models are able to describe sli...
68 citations
TL;DR: In this paper, the authors evaluated the properties of particleboard panels bonded with ionic liquid treated lignin-phenol- glyoxal (LPG) resins.
Abstract: The aim of this research was to evaluate the properties of particleboard panels bonded with ionic liquid treated lignin- phenol- glyoxal (LPG) resin. For this purpose, soda bagasse lignin w...
32 citations
TL;DR: In this article, the failure of adhesively bonded CFRP (Carbon Fiber Reinforced Plastics)-aluminum alloy joints applied to High Speed EMU (Electric Multiple Units) more accurately with considerat...
Abstract: To predict the failure of adhesively bonded CFRP (Carbon Fiber Reinforced Plastics)-aluminum alloy joints applied to High Speed EMU (Electric Multiple Units) more accurately with considerat...
31 citations
TL;DR: In this article, the main objective was to use thermally expandable particles (TEPs) in order to create a graded adhesive along the overlap by local mixing of the particles.
Abstract: The main objective of this work was to use thermally expandable particles (TEPs) in order to create a graded adhesive along the overlap by local mixing of the particles. Different amounts o...
30 citations
TL;DR: In this article, premature failure due to debonding and peeling of the joint is the major cause of failure of adhesively-bonded composite composite structures due to premature failure.
Abstract: Due to their many advantages, adhesively bonded joints are widely used to join components in composite structures. However, premature failure due to debonding and peeling of the joint is the major ...
20 citations
TL;DR: In this article, the authors present a relatively simple design approach based upon fracture mechanics and associated double-cantilever beam (DCB) tests that complemented tensile tests for material characterisation.
Abstract: Glued-in rods (GiR) represent a very successful type of adhesively bonded joints in timber engineering. Despite their apparent geometrical simplicity, their dimensioning still challenges practitioners. A major source of mechanical complexity resides in the orthotropic nature of the wood, or engineered wood products, as laminated veneer lumber (LVL). This paper presents a relatively simple design approach based upon fracture mechanics (FM) and associated double-cantilever beam (DCB) tests that complemented tensile tests for material characterisation. In comparison with the state-of-the-art related to FM in timber engineering, the paper presents a practitioner oriented approach of a yet complex set of GiR geometries involving beech LVL (M16-8.8 threaded rods embedded in cross sections of 120 × 120 mm2 and embedment lengths of 96mm, 128mm and 160mm). The developed numerical model resulted in a good description of the load-displacement of a series of full scale, including very good estimates of their ...
20 citations
TL;DR: In this paper, an extensive investigation on the low-energy impact damage and post-impact fatigue of composite/steel and composite/composite adhesive joints experimentally and numerically is presented.
Abstract: This paper presents an extensive investigation on the low-energy impact damage and post-impact fatigue of composite/steel and composite/composite adhesive joints experimentally and numerically. Usi...
19 citations
TL;DR: Hybrid joints as discussed by the authors are a type of mechanical connections in which both a traditional mechanical joint (i.e. riveting, clinching, welding) and adhesive bonding coexist in order to obtain a better performance.
Abstract: Hybrid joints consist of mechanical connections in which both a traditional mechanical joint (i.e. riveting, clinching, welding) and adhesive bonding coexist in order to obtain a better performance...
19 citations
TL;DR: In this paper, an approach to predict the behavior of an epoxy adhesive in bulk form in a marine environment is described, and the experimental conditions and the predictive framework are described.
Abstract: This article describes an approach to predict the behaviour of an epoxy adhesive in bulk form in a marine environment. First, the material, the experimental conditions and the predictive framework ...
19 citations
TL;DR: In this paper, the effect of multi-walled carbon nanotubes (MWCNTs) on the creep behavior of adhesively bonded joints was investigated and the results showed that adding 0.1-wt% of MWCNTs into the adhesive layer caused maximum reductions of 57%, 60% and 47% in the steady-state creep rates of the joints tested at 30, 40 and 50°C, respectively.
Abstract: Polymeric materials are prone to creep loading. This paper is aimed to study the effect of multi-walled carbon nanotubes (MWCNTs) on creep behavior of adhesively bonded joints. Neat and MWCNTs-reinforced adhesively bonded joints were manufactured and tested under creep loading at elevated temperatures. Two MWCNT weight percentages of 0.1 and 0.3 were used for reinforcing the single lap joints (SLJs) and the joints were tested at different temperature and load levels. The results showed that 0.1 wt% of MWCNTs resulted maximum improvements in creep behavior of adhesive joints. Adding 0.1 wt% of MWCNTs into the adhesive layer caused maximum reductions of 57%, 60% and 47% in the steady-state creep rates of the joints tested at 30, 40 and 50°C, respectively. Furthermore, 0.1 wt% of MWCNTs resulted maximum reductions of 29%, 33% and 37% in the creep strains corresponding to a specific creep loading time and maximum reductions of 23%, 45% and 49% in the elastic strains corresponding to the time at which ...
19 citations
TL;DR: In this paper, a method for fabricating adhesively bonded joints with graded properties along the bond line was proposed by utilizing two types of acrylic adhesives, one hard and the other soft, by controlling the mixing ratio.
Abstract: A method for fabricating adhesively bonded joints with graded properties along the bond-line was proposed. By utilizing two types of acrylic adhesives, one hard and the other soft, the properties of the mixture were changed by controlling the mixing ratio. An applicator for the adhesives was developed and used for the experiments, in which property-graded adhesive layers were actually produced. The properties, i.e., stress-strain curves at various points of the property-graded adhesive layer, were experimentally measured, and the validity of the proposed method was confirmed. The Young’s moduli at multiple points of the adhesive layer changed from 34.7 MPa to 634 MPa by changing the mixing ratio of the adhesives.
TL;DR: In this article, the adhesion of a punch to a linear elastic, confined layer is investigated, and numerical analysis is performed to determine the equivalent elastic modulus in terms of layer confinement.
Abstract: The adhesion of a punch to a linear elastic, confined layer is investigated. Numerical analysis is performed to determine the equivalent elastic modulus in terms of layer confinement. The s...
TL;DR: In glass and facade constructions, elastic thick layer bonds are used to join glass panes to metal adapter frames and glass support elements, referred to as Structural Gla... as discussed by the authors.
Abstract: In glass and facade constructions, elastic thick layer bonds are used to join glass panes to metal adapter frames and glass support elements. This joining technique is referred to as Structural Gla...
TL;DR: In this paper, a method has been proposed to obtain the failure envelope of brittle adhesives using the experimental failure loads of precracked single lap joints (SLJs), based on the principles of linear elastic fracture mechanics (LEFM), on J-integral relations, and on results of a numerical analysis.
Abstract: In this study, a method has been proposed to obtain the failure envelope of brittle adhesives using the experimental failure loads of precracked single lap joints (SLJs). The proposed technique is based on the principles of linear elastic fracture mechanics (LEFM), on J-integral relations, and on results of a numerical analysis. Compared to the previous approaches, the introduced experimental method has some advantages such as low manufacturing costs and simpler test procedure. The proposed method can also provide a wide range of mode mix ratios without the need of an additional apparatus. The fracture envelope obtained from the proposed method was then verified by performing some fracture tests including double cantilever beam (DCB), end-notched flexure (ENF), and single leg bending (SLB) specimens. Good correlation was seen between the fracture envelopes of the proposed method and the ones obtained from the fracture mechanics experiments.
TL;DR: By using fiber-reinforced plastics as the material for lightweight structures, adhesive bonding becomes an increasingly focused solution for joining these components as mentioned in this paper, in comparison to bolted joints, which is the most commonly used solution.
Abstract: By using fiber-reinforced plastics as the material for lightweight structures, adhesive bonding becomes an increasingly focused solution for joining these components. In comparison to bolted joints...
TL;DR: The dissemination of composite materials introduces applications of hybrid structures with composite and metal parts as discussed by the authors, and the development of reliable methodologies to evaluate the performance of these composite materials is needed.
Abstract: The dissemination of composite materials introduces applications of hybrid structures with composite and metal parts. The development of reliable methodologies to evaluate the performance of these ...
TL;DR: Structural adhesive bonding has become increasingly important for the joining of dissimilar materials as well as for the reduction of weight of joined structures as mentioned in this paper, and to ensure the quality of these bon...
Abstract: Structural adhesive bonding has become increasingly important for the joining of dissimilar materials as well as for the reduction of weight of joined structures. To ensure the quality of these bon...
TL;DR: In this article, the authors implemented ILT methods to characterize the delamination behavior of asymmetric steel/carbon fiber reinforced plastic (CFRP) hybrids and improved the delaminat...
Abstract: Interlaminar shear test methods (ILS) were implemented to characterize the delamination behavior of asymmetric steel/carbon fiber reinforced plastic (CFRP) hybrids. To improve the delaminat...
TL;DR: In this article, a mode-dependent cohesive zone model for the simulation of metal to metal adhesive joints is directly determined, and three consecutive steps have been taken into account for three consecutive stages.
Abstract: In this paper, a new mode-dependent cohesive zone model for the simulation of metal to metal adhesive joints is directly determined. Three consecutive steps have been taken into account for...
TL;DR: Wang et al. as discussed by the authors investigated the effect of hygrothermal aging on scarf-repaired composite structures, bulk adhesive specimens and scarf repaired composite laminates of three different laminate thicknesses.
Abstract: Adhesively bonded techniques have been widely used to joint or repair composite components in aircraft structures, which are inevitably subjected to various environmental conditions in service. Aiming to investigate the effect of hygrothermal aging on scarf-repaired composite structures, bulk adhesive specimens and scarf-repaired composite laminates of three different laminate thicknesses were tested before and after hygrothermal aging in this paper. Experimental results indicate that the strength reduction of scarf-repaired composite laminates after aging is less evident than that of bulk adhesive. For scarf-repaired composite laminates, a linear relation is found between the strength reduction and their moisture contents. Visual inspection and microscopic observation were performed to investigate the damage mechanism. In addition, a finite-element model based on continuum damage model and a degraded bilinear traction–separation cohesive zone model considering hygrothermal aging degradation was e...
TL;DR: In this paper, a method is presented to measure crack length in dynamically loaded adhesively bonded CFRP-joints by means of 2D digital image correlation, where the strain level in front of the crack tip was defined as maximum possible strain within the bond line.
Abstract: To predict lifetime and damage tolerance of adhesively bonded joints, crack growth behavior need to be understood, as it oftentimes serves as a basis or proof of, e.g., numerical models. Within this work, a method is presented to measure crack length in dynamically loaded adhesively bonded CFRP-joints by means of 2D digital image correlation. Automated picture acquisition at the maximum force level within a cycle allows measurements during the fatigue testing. The strain level in front of the crack tip was defined as maximum possible strain within the bond line. Higher strains were denoted as crack. Marking the crack path automatically led to the associated crack length and could afterward be derived to a crack propagation rate. Different destructive tests were carried out on composite single, double and crack lap shear specimens.
TL;DR: The lack of a widely accepted test standard for characterizing the mode II fatigue disbond growth behavior of adhesively bonded interfaces is a challenge to the research community in terms of produ...
Abstract: The lack of a widely-accepted test standard for characterizing the mode II fatigue disbond growth behavior of adhesively bonded interfaces is a challenge to the research community in terms of produ...
TL;DR: There is an urgent need for heat-resistant adhesives with high bonding strength in order to be able to fabricate large and complex SiC components for aeronautical and astronautical applications as discussed by the authors.
Abstract: There is an urgent need for heat-resistant adhesives with high bonding strength in order to able to fabricate large and complex SiC components for aeronautical and astronautical applications. In th...
TL;DR: In recent years, there has been an increasing interest in repairing offshore steel structures by using adhesively joined carbon fiber reinforced polymers (CFRP) for such procedure as mentioned in this paper.
Abstract: In recent years, there has been an increasing interest in repairing offshore steel structures by using adhesively joined carbon fiber reinforced polymers (CFRP). For such procedure, surface prepara...
TL;DR: In this paper, surface contamination of an adherend has an influence on its adhesive bonding properties, and various contaminants, including silicone oil, mineral oil, a fluorine relea...
Abstract: Surface contamination of an adherend has an influence on its adhesive bonding properties. To investigate this phenomenon, various contaminants, including silicone oil, mineral oil, a fluorine relea...
TL;DR: Bonding with adhesives is increasingly being used in the design of mechanical structures, because of the significant advantages of this technique compared to traditional joints as mentioned in this paper, and different joint con...
Abstract: Bonding with adhesives is increasingly being used in the design of mechanical structures, because of the significant advantages of this technique compared to traditional joints. Different joint con...
TL;DR: In this article, the thermal conductivity of an acrylic pressure-sensitive adhesive (PSA) with the incorporation of functionalized and reduced graphene oxide (frGO) was investigated.
Abstract: This work reports about the enhancement of the thermal conductivity of an acrylic pressure-sensitive adhesive (PSA) with the incorporation of functionalized and reduced graphene oxide (frGO...
TL;DR: In this article, the shape of a liquid drop on a flat solid surface is examined by using the minimization of free energy, which consists of the contributions from the gravitational potential energy of the drop.
Abstract: The shape of a liquid drop on a flat solid surface is examined by using the minimization of free energy. This free energy consists of the contributions from the gravitational potential energy of th...
TL;DR: In this article, the authors evaluated the shear fracture toughness (JIIC) and Cohesive Zone Models (CZM) laws of bonded joints for three adhesives with distinct ductility.
Abstract: The use of adhesive bonding as a joining technique is increasingly being used in many industries because of its convenience and high efficiency. Cohesive Zone Models (CZM) are a powerful tool for the strength prediction of bonded joints, but they require an accurate estimation of the tensile and shear cohesive laws of the adhesive layer. This work evaluated the shear fracture toughness (JIIC) and CZM laws of bonded joints for three adhesives with distinct ductility. The End-Notched Flexure (ENF) test geometry was used. The experimental work consisted of the shear fracture characterization of the bond by the J-integral. Additionally, by this technique, the precise shape of the cohesive law was defined. For the J-integral, digital image correlation was used for the evaluation of the adhesive layer shear displacement at the crack tip during the test, coupled to a Matlab sub-routine for extraction of this parameter automatically. Finite Element Method (FEM) simulations were carried out in Abaqus® to a...
TL;DR: In this paper, the durability evaluation was carried out for SGA structural adhesives from two different manufacturers, and the substrate of the SGA joint was assumed that the aluminum substrate was A5052.
Abstract: There are advantages to replacing weld joints with structural adhesive joints in shipbuilding, including reduction of labor associated with hot work and straightening work. However, the dimensional accuracy of the structural members must be the same for structural adhesive and welding, so the structural adhesive must fill gaps of the millimeter order. The lack of knowledge about the long-term reliability of thick adhesive layers is an obstacle to its practical use. Therefore, accelerated deterioration tests under high temperature and high humidity, recovery tests by drying after water absorption, xenon exposure weatherability tests, and salt water mist resistance tests were conducted to obtain relationships between each deterioration factor and decreasing time of strength retention rate. The durability evaluation was carried out for SGA structural adhesives from two different manufacturers. In this study, the substrate of the structural adhesives joint was A5052. It is assumed that the aluminum su...