An Investigation on the Fatigue Behavior of Balanced and Unbalanced Epoxy-Aluminum Single Lap Joints

Published on Apr 14, 2015
· DOI :10.4271/2015-01-0551
Qiuren Chen1
Estimated H-index: 1
(NU: Nanjing University),
Qiuren Chen1
Estimated H-index: 1
(NU: Nanjing University)
+ 3 AuthorsJohn Joseph Francis Bonnen9
Estimated H-index: 9
(Ford Motor Company)
Source
Abstract
References14
Newest
#1M. H. Khan (U of W: University of Windsor)H-Index: 1
#2O. A. Gali (U of W: University of Windsor)H-Index: 1
Last. A.R. Riahi (U of W: University of Windsor)H-Index: 13
view all 4 authors...
An experimental investigation was performed to study the effect of surface roughness and oxidation on the shear strength of single-lap-joints of AA6061, AA7075 aluminum alloys and an AISI 1080 steel alloy bonded with two different epoxy adhesives. An optimum surface roughness that provided the maximum shear strength was obtained for all the alloys at room temperature. The variation of the shear stress due to the different heat treatment temperatures revealed that the oxides developed on the allo...
36 CitationsSource
This paper presents a literature review on fatigue in adhesively bonded joints and covers articles published in the Web of Science from 1975 until 2011. About 222 cited articles are presented and reviewed. The paper is divided into several related topics such as fatigue strength and lifetime analysis, fatigue crack initiation, fatigue crack propagation, fatigue durability, variable fatigue amplitude, impact fatigue, thermal fatigue, torsional fatigue, fatigue in hybrid adhesive joints, and nano-...
95 CitationsSource
#1Heraldo da Costa Mattos (Federal Fluminense University)H-Index: 2
#1Heraldo da Costa Mattos (Federal Fluminense University)H-Index: 7
Last. Roberto PalazzettiH-Index: 17
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The present paper is concerned with a phenomenological model to perform the failure analysis of composite adhesive single lap joints with arbitrary glued area. The theory is conceived for joints composed by highly resistant elastic adherends bonded with brittle–elastic adhesives. It is shown that, under certain conditions, the rupture forces (in the case of monotonic loading) and lifetimes (in the case of cyclic loading) of two joints with different glued areas can be correlated using a shape fa...
45 CitationsSource
#1S. Azari (U of T: University of Toronto)H-Index: 11
#2Marcello Papini (RyeU: Ryerson University)H-Index: 40
Last. Jan K. Spelt (U of T: University of Toronto)H-Index: 48
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Abstract The effect of bondline thickness, from 130 μm to 790 μm, on the fatigue and quasi-static fracture behavior of aluminum joints bonded using a toughened epoxy adhesive was studied experimentally under mode-I (DCB) and mixed-mode (ADCB) loading. Under mode-I loading, it was found that the fatigue threshold energy release rate, Gth, decreased for very thin bondlines, while under mixed-mode loading, the Gth changed very little with bondline thickness. In both cases, the effect of bondline th...
62 CitationsSource
#1K.B. Katnam (University of Surrey)H-Index: 17
#2A.D. Crocombe (University of Surrey)H-Index: 46
Last. Ian Ashcroft (Lboro: Loughborough University)H-Index: 60
view all 4 authors...
Structural adhesives are used widely in aerospace and automotive applications. However, fatigue damage in these adhesives is an important factor to be considered in the design of adhesively bonded structural members that are subjected to cyclic loading conditions during their service life. Fatigue life of adhesively bonded joints depends mainly on the fatigue load and the load ratio. A fatigue damage model is presented in this paper to include the effect of fatigue mean stresses on the failure b...
25 CitationsSource
#1Peter Davies ('IFREMER': IFREMER)H-Index: 79
#2Laurent SohierH-Index: 13
Last. Romain Créac'HcadecH-Index: 15
view all 7 authors...
While the geometry of aerospace assemblies is carefully controlled, for many industrial applications such as marine structures bond line thickness can vary significantly. In this study epoxy adhesive joints of different thicknesses between aluminium substrates have been characterized using physico-chemical analyses (differential scanning calorimetry, DSC; dynamic mechanical analysis, DMA; spectroscopy), nano-indentation and mechanical testing. Thermal analyses indicated no influence of thickness...
86 CitationsSource
#1A. Graner Solana (University of Surrey)H-Index: 2
#2A.D. Crocombe (University of Surrey)H-Index: 46
Last. Ian Ashcroft (Lboro: Loughborough University)H-Index: 60
view all 4 authors...
This paper presents detailed experimental fatigue data obtained from a selection of joints tested under cyclic loads. Some were tested to failure to determine fatigue load-life data. The other specimens were tested to induce different levels of damage. Multiple strain gauges (SGs) were used to record the change in backface strain during the testing, allowing measurement of damage in different locations. The overlap region was then sectioned and polished so it could be inspected using microscopy....
25 CitationsSource
There are many advantages that polymeric adhesives can offer compared to the more traditional methods of joining such as bolting, brazing, welding, mechanical fasteners, etc. and epoxy adhesives represent the most common type of structural adhesive. When polymerised, epoxy adhesives are amorphous and highly-crosslinked materials and this microstructure results in many useful properties for structural engineering applications, such as a high modulus and failure strength, low creep, and, by carefu...
134 CitationsSource
#1Anthony J. Kinloch (Imperial College London)H-Index: 86
#2M.S.G. Little (Imperial College London)H-Index: 3
Last. John F. Watts (University of Surrey)H-Index: 54
view all 3 authors...
Abstract The cyclic-fatigue behaviour of adhesive joints, which consisted of an aerospace-grade epoxy-adhesive bonding aluminium-alloy substrates, has been investigated. Fracture-mechanics tests were used to obtain the relationship between the rate of fatigue crack growth per cycle, d a /d N , and the maximum strain-energy release rate, G max , applied during the fatigue cycle. These cyclic-fatigue tests were conducted in both a “dry” environment of 23±1°C and 55% relative humidity and a “wet” e...
139 CitationsSource
#1Crocombe A.D (University of Surrey)H-Index: 1
#2G. Richardson (University of Surrey)H-Index: 6
Abstract Normalised fatigue load-life data for four different structural configurations of the same adhesive-substrate system have been obtained through a large programme of fatigue testing. Within these four configurations the effect of both the mean load and, to a lesser extent, the frequency of the fatigue cycle have been assessed. For the particular adhesibe system being considered the effect of the frequency of the fatigue cycle was shown to be relatively unimportant. The mean load however ...
92 CitationsSource
Cited By4
Newest
#1Qiuren Chen (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 3
#2Haiding Guo (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 11
Last. Xuming Su (Ford Motor Company)H-Index: 18
view all 5 authors...
Abstract Mixed-mode fatigue crack growth behavior of an automotive adhesive bonding system (AA5754O- A951-BM4601) has been investigated using a compound compact mixed-mode specimen. The test was performed under load control with 0.1 R ratio and 3Hz frequency. A long-distance moving microscope was employed to record the real-time length of the fatigue crack in the adhesive layer during testing. The strain energy release rate components of the crack were analyzed by finite element method. The pure...
11 CitationsSource
#1Qiuren Chen (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 3
#2Haiding Guo (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 11
Last. Hong Tae Kang (UM: University of Michigan)H-Index: 17
view all 5 authors...
1 CitationsSource
#1Qiuren Chen (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 3
#2Haiding Guo (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 11
Last. Hong Tae Kang (UM: University of Michigan)H-Index: 17
view all 5 authors...
Abstract Practical fatigue life prediction methods using computer aided engineering (CAE) for adhesively bonded joints are needed to reduce the risk of potential fatigue failures and unnecessary over-designs for automotive body structures. This paper presents an investigation on the tensile and fatigue behaviors of adhesively bonded lap shear and coach peel joints for A5754-O. From suspended tensile tests, macroscopic cracks were found in the adhesive layer of the lap shear joints before the joi...
15 CitationsSource
#1Qiuren Chen (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 3
#2Haiding Guo (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 11
Last. Xuming Su (Ford Motor Company)H-Index: 18
view all 4 authors...
AbstractFatigue and corrosion damage are the major concerns of automotive adhesive joints, yet literature reports few works about the in situ fatigue durability of adhesive joints in corrosive environment. This study presents an investigation on the fatigue durability of automotive adhesive single lap joints by an in situ corrosion fatigue test. The joints were manufactured with commercial coated AA5754-O aluminum sheets bonded by a toughened epoxy structural adhesive. An in situ corrosion chamb...
2 CitationsSource