Durability aspects of adhesively bonded thick adherend lap shear joints

Knox, E.M; Cowling, M.J.

doi:10.1016/s0143-7496(99)00063-9

Cited by 53 publications

(18 citation statements)

References 12 publications

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“…While exposure to moisture rendered some of the adhesives essentially unusable for structural purposes, others exhibited very good moisture resistance. Other researchers have observed a moderate reduction of adhesive strength and stiffness, in the range of 10-20 %, due to exposure to moist conditions (Knox and Cowling, 2000 ).…”

Section: Susceptibility To Moisturementioning

confidence: 91%

“…Testing of companion double-lap shear joints indicated that the magnitude of the bond strength degradation was comparable to the magnitude of deterioration of the tensile strength of the bulk adhesive under similar exposure conditions. In contrast, tests by several other researchers suggest that the degradation of bonded joints cannot be attributed only to the degradation of the adhesive properties (Horton et al ., 1992 ;Knox and Cowling, 2000 ;Dawood and Rizkalla, 2010 ). In all of these studies, bulk adhesive tensile specimens and companion bonded lap joints were fabricated, conditioned and tested to determine their residual strengths.…”

Section: Susceptibility To Moisturementioning

confidence: 99%

See 1 more Smart Citation

Durability of steel components strengthened with fiber-reinforced polymer (FRP) composites

Dawood

2014

Rehabilitation of Metallic Civil Infrastructure Using Fiber Reinforced Polymer (FRP) Composites

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Section: Susceptibility To Moisturementioning

confidence: 91%

Section: Susceptibility To Moisturementioning

confidence: 99%

Durability of steel components strengthened with fiber-reinforced polymer (FRP) composites

Dawood

2014

Rehabilitation of Metallic Civil Infrastructure Using Fiber Reinforced Polymer (FRP) Composites

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“…10a and 10b. The water shadow is produced by water diffusion within the joint and its size increases as the exposure time increases [3]. In these specimens water penetration within the joint seems to affect the interfacial region.…”

Section: Examination Of Failed Surfacesmentioning

confidence: 98%

Adhesive bonding of aluminium with structural acrylic adhesives: durability in wet environments

Real¹,

Santayana²,

Abenójar³

et al. 2006

Journal of Adhesion Science and Technology

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The durability of EN AW 6082-T651 aluminium alloy joints bonded with a toughened acrylic adhesive was investigated upon exposure to wet environments (humidity, water immersion and salt water immersion). Environmentally-friendly surface treatments were used to avoid hexavalent chromium. Single lap shear tests were used to determine the durability of the adhesively bonded joints. Specimens were exposed to 31% and 95% relative humidity and submerged in deionized water and 3 wt% sodium chloride solution at 25 • C and 50 • C, for 10, 30 and 90 days. The data collected in the experiments showed that the durability was higher for surfaces treated with γ -methacryloxypropyltrimethoxysilane (γ -MPS) and sulfo-ferric etchant (P2 etch) than other surface treatments. Both these treatments improved considerably the durability in all environments tested. The results indicate that specimens even without surface treatment maintained a significant residual strength after exposure to low humidity environment (room temperature at 31% RH). The joints exposed to a high humidity environment showed a higher reduction in adhesive strength than those immersed in deionized water and saline solution.

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“…Knox and Cowling [22] and Broughton and Mera [23] studied the effect of temperature and humidity on thin bonded metal joints and reported that exposure to extremes can cause plasticization of adhesives and a strength reduction of the resins. The effect of seawater salt solutions on the mechanical behaviour of resin-bonded concrete surfaces has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Mechanical performance of statically loaded flat face epoxy bonded concrete joints

et al. 2018

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One of the main challenges in the offshore renewable energy industry is the reduction in the levelised cost of energy of wind, wave and tidal devices. The use of concrete as the primary construction material in such devices presents a low unit cost, high marine durability alternative to steel, however, to maximise material efficiency factors such as mix constituent design, structural detailing and manufacturing processes have to take into account the specific conditions of the marine environment. Pre-cast segmental construction can be considered as one of the fastest and cheapest construction options. However the challenges regarding performance of epoxy bonded concrete in marine environment should be taken into account. This paper presents the results of an experimental programme on the performance of shear and tensile capacity of flat face concrete joints, focussing on the effect of substrate surface preparation, joint thickness, properties of epoxy resins, exposure to seawater and presence of joint defects on the ultimate failure load. The ultrasonic pulse velocity (UPV) method for detection of defects in the adhesive layer was examined and digital image correlation is used to observe the surface strain flow through the joint. The results indicate that the epoxy joints behave monolithically and remain undamaged under different types of static loading. The joints do not significantly interrupt the flow of strain but can locally affect the distribution of strain (and thus stiffness and stresses) in a structure. An increase in the density of the epoxy (and the filler content) leads to the increase in the joint strength and thicker joints are less affected by small defects in the bonding layer. The majority of tested specimens failed by cracking of concrete rather than by debonding of the joint, whilst compressive stresses acting on the joint can help to augment its shear strength. Sandblasting of bonded surfaces can improve performance of joints, whereas UPV testing may be used for quality control of epoxybonded joints.

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Durability aspects of adhesively bonded thick adherend lap shear joints

Cited by 53 publications

References 12 publications

Durability of steel components strengthened with fiber-reinforced polymer (FRP) composites

Durability of steel components strengthened with fiber-reinforced polymer (FRP) composites

Adhesive bonding of aluminium with structural acrylic adhesives: durability in wet environments

Mechanical performance of statically loaded flat face epoxy bonded concrete joints

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