Studying Effects of Arc Discharge Surface Texturing on Stress Distribution in Adhesively Bonded Joints by Using Finite Element Modeling

2011 ◽  
Author(s):  
Mehdi Asgharifar ◽  
Fanrong Kong ◽  
Blair Carlson ◽  
Radovan Kovacevic
Keyword(s):  
Stress Distribution ◽  
Adhesive Bonding ◽  
Arc Discharge ◽  
Treatment Method ◽  
Bonded Joints ◽  
Textured Surfaces ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Optical Profilometer ◽  
Adhesively Bonded Joint

This study investigates the potentiality of using atmospheric-pressure Direct Current (DC) plasma arc discharge as a surface treatment method of aluminum alloys in adhesively bonded joints in order to enhance adhesion. The surface morphology exposed to the arc for the current of 40 A (low intensity) and the plasma torch scanning speeds between 20 and 120 mm/s, exhibits a micro-scale surface roughness appropriate for adhesive bonding. The arc textured surfaces are characterized by using an optical profilometer. Additionally, the effect of modified surface on the stress distribution throughout the single-lap adhesively bonded joint in tension is explored by 2D FEM. The geometrical model for FE analysis of adhesively bonded structure is generated by including the surface texture coordinates obtained from the optical profilometer.

scholarly journals Defects and uncertainties of adhesively bonded composite joints

2021 ◽  
Vol 3 (9) ◽  
Author(s):  
Sadik Omairey ◽  
Nithin Jayasree ◽  
Mihalis Kazilas
Keyword(s):  
Composite Materials ◽  
Composite Structures ◽  
Production Efficiency ◽  
Adhesive Bonding ◽  
Detection Methods ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Wide Range ◽  
Bonded Composite

AbstractThe increasing use of fibre reinforced polymer composite materials in a wide range of applications increases the use of similar and dissimilar joints. Traditional joining methods such as welding, mechanical fastening and riveting are challenging in composites due to their material properties, heterogeneous nature, and layup configuration. Adhesive bonding allows flexibility in materials selection and offers improved production efficiency from product design and manufacture to final assembly, enabling cost reduction. However, the performance of adhesively bonded composite structures cannot be fully verified by inspection and testing due to the unforeseen nature of defects and manufacturing uncertainties presented in this joining method. These uncertainties can manifest as kissing bonds, porosity and voids in the adhesive. As a result, the use of adhesively bonded joints is often constrained by conservative certification requirements, limiting the potential of composite materials in weight reduction, cost-saving, and performance. There is a need to identify these uncertainties and understand their effect when designing these adhesively bonded joints. This article aims to report and categorise these uncertainties, offering the reader a reliable and inclusive source to conduct further research, such as the development of probabilistic reliability-based design optimisation, sensitivity analysis, defect detection methods and process development.

Effect of Temperature on Shear Strength of Adhesively Bonded Joints for Automobile Industry

2011 ◽  
Vol 418-420 ◽  
pp. 1259-1265 ◽  
Author(s):  
Ping Hu ◽  
Xiao Han ◽  
Long Li ◽  
Qi Shao ◽  
Wei Dong Li
Keyword(s):  
Shear Strength ◽  
Automobile Industry ◽  
Driving Safety ◽  
Effect Of Temperature ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Joint Shear Strength ◽  
Adhesively Bonded Joints ◽  
Fracture Surfaces ◽  
Adhesively Bonded Joint

Due to the significant effect on vehicle lightweight, adhesively bonded joint in structural components is widely adopted in automobile industry in recent years, which leads to the benefits in fuel economy, reduced emissions and driving safety. In this paper, the performances of adhesively bonded joints with three different adhesive types after different temperature treatments are investigated through joint shear strength test. Visual inspection is performed on fracture surfaces after joint failure. Results showed that both low and high temperatures have impact on joint strength and lead to different fracture modes. Stiff and flexible adhesives also result in different fracture surfaces in the overlap zone as the temperature varies.

Stress Distribution of Bonded Joint with Rubbery Adhesives

2011 ◽  
Vol 189-193 ◽  
pp. 3427-3430
Author(s):  
Xiao Cong He
Keyword(s):  
Stress Distribution ◽  
Stress Component ◽  
Adhesive Layer ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Shear Stress Component ◽  
Element Analysis ◽  
Adhesively Bonded Joints ◽  
Bonded Joint ◽  
Stress Components

This paper deals with the stress distribution in adhesively bonded joints with rubbery adhesives. The 3-D finite element analysis (FEA) software was used to model the joint and predict the stress distribution along the whole joint. The FEA results indicated that there are stress discontinuities existing in the stress distribution within the adhesive layer and adherends at the lower interface and the upper interface of the boded section for most of the stress components. The FEA results also show that the stress field in the whole joint is dominated by the normal stresses components S11, S33 and the shear stress component S13. The features and variations of these critical stresses components are discussed.

Effect of Adhesive Layer’s Voids on Stress Distribution of Adhesively Bonded Joints

2010 ◽  
Vol 139-141 ◽  
pp. 986-989 ◽  
Author(s):  
Hai Long Zhao ◽  
Zong Zhan Gao ◽  
Zhu Feng Yue ◽  
Zhi Feng Jiang
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Adhesive Layer ◽  
Shear Loading ◽  
Lap Joints ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Single Lap Joints

The stress distribution of adhesively-bonded single lap joints under tensile shear loading is analyzed using 2-dimensional elastic-plastic finite element method (FEM). Special attentions have been put on the influence of void in adhesive on the stress distribution of adhesively-bonded joints. The results show that the stress concentration of the void is less than that of the end part of the joints when adhesive layer’s deformation was in the range of elastic. Moreover, the influence of the void on the stress distribution becomes less when the void moving from the end-part to the middle. The stress concentration becomes larger and the stress distribution of adhesive’s mid-thickness region becomes flatter when adhesive layer has biggish plastic deformation. Finite element results show an agreement with the theoretical results.

Experimental and Analytical Investigations of the Dynamic Analysis of Adhesively Bonded Joints for Composite Structures

2009 ◽  
Vol 147-149 ◽  
pp. 663-675 ◽  
Author(s):  
S.M. Ghoneam ◽  
A.A. Hamada ◽  
M.I. El-Elamy
Keyword(s):  
Dynamic Analysis ◽  
Composite Structures ◽  
Damping Capacity ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Line Configuration ◽  
Bonded Joint ◽  
Adhesive Bonded Joints ◽  
Adhesively Bonded Joint

Adhesively bonded joints are used extensively in various industries. Some imperfections like holes, thermal residual stresses occurring in the bolted, welded, riveted, and soldered joints don't take place in adhesively bonded joints. Hence, the main advantages of bonded joint are lightness, sealing, corrosion resistance, heat and sound isolation, damping, and quickly mounting facility which have been highly proved. This paper introduces an attempt to study the dynamic analysis of adhesively bonded joint for composite structures to investigate mainly the influences of lamina code number, bonded adhesive line configuration and boundary condition on the dynamic behavior of the test specimens containing composite assembly. The numerical based on the use of finite element model (FEM) modified by introducing unified mechanical properties are represented and applied to compute efficiently the Eigen-nature for composite bonded structures. The experimental tests are conducted to investigate such adhesive bonded joints using two different techniques. The first technique includes an ultrasonic technique in which the magnetostractive pulse echo delay-line for material characterization of composite material is used. The second technique is bassed on the use of the frequency response function method (FRF) applying the hammering method. The comparison between the numerical and experimental results proves that the suggested finite element models of the composite structural beams with bonded joints provide an efficient by accurate tool for the dynamic analysis of adhesive bonded joints. The damping capacity is inversely proportional to the stiffness of the bonded joint specimens. The type of the proportionality depends mainly on the bond line configuration type, lamina orientation, and boundary conditions. This in turn enables an accurate evaluation for selecting the proper characteristics of the specimens for controlling the present damping capacity and the proper resistance against deformation during the operating process. The present study provides an efficient non-destructive technique for the prediction of dynamic properties for an adhesive bonded joint for the studied composite structure systems. The coordination of the experimental and numerical techniques makes it possible to find an efficient tool for studying the dynamic performance of adhesively bonded joint for composite structures.

New Electrical Potential Method for Measuring Crack Growth in Nonconductive Materials

2003 ◽  
Author(s):  
H. Nayeb-Hashemi ◽  
D. Swet ◽  
A. Vaziri
Keyword(s):  
Thin Layer ◽  
Crack Length ◽  
Crack Growth ◽  
Electric Potential ◽  
Electrical Resistance ◽  
Electrical Potential ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Adhesively Bonded Joint

D.C. electric potential technique has been used to monitor crack growth in conductive materials. A constant DC current is ppased through thesse materials and the crack length is measured through the changes in the electrical voltage at the crack mouth. However, this method is not applicable in crack growth measurement in nonconductive materials or adhesively bonded joints. For these materials, a new method is developed and is shown to provide a very accurate method for measuring the crack length. The surface of these materials is coated with a thin layer of carbon paint and the crack lenght is measured through the changes in the electrical resistance of the carbon paint, as the crack grows both in the base material and the thin layer carbon paint. In contrast to the D.C. electric potential technique where the position of the probes for measuring the crack length is very important for an accurate measurement of the crack length, the new technique is little sensitive to the probe location. Crack growth is measured in adhesively bonded joints subjected to creep loadings. A modified Compact tension specimen is cut in two pieces across its notch area. The pieces are then glued jusing an adhensive. The surface of the specimen is painted with a thin layer of carbon paint and the changes in its electrical resistance are monitored. It is shown that the carbon paint method provides a quiet sensitive method for monitoring the crack growth. The creep crack growth rate in the adhesively bonded joint is related to Mode I energy release rate, G1. It is shown that the crack grows in the middle of the adhesive layer rather than at the interface of the joint. Micromechanisms of the crack growth are studied using a scanning electron microscope. The damage consists of numerous crazed regions at the crack tip. Crack grows by the linkage of the crazed region.

FEA of Fatigue Behaviour of Adhesively Bonded Joints

2010 ◽  
Vol 148-149 ◽  
pp. 753-757 ◽  
Author(s):  
Xiao Cong He
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Speed ◽  
Adhesive Bonding ◽  
Fatigue Behaviour ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Element Analysis ◽  
Adhesively Bonded Joints ◽  
Major Factors

Adhesive bonding is a high-speed fastening method which is suitable for joining advanced lightweight sheet materials that are hard to weld. Latest literature relating to finite element analysis (FEA) of fatigue behaviour of adhesively bonded joints is reviewed in this paper. The recent development in FEA of fatigue behaviour of adhesively bonded joints is described with particular reference to three major factors that influence the fatigue behaviour of adhesively bonded joints: failure mechanism, environmental effects and hybrid joining techniques. The main FE methods used in FEA of fatigue behaviour of adhesively bonded joints are discussed and illustrated with brief case studies from the literature.

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