Adherend Surface Preparation for Structural Adhesive Bonding

Clearfield, H. M.; McNamara, D.K.; Davis, Glyn

doi:10.1007/978-1-4757-9006-1_8

Cited by 24 publications

(6 citation statements)

References 50 publications

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“…40,49,50 Finally, increasing concentrations of active ions such as sodium and chloride have been shown to result in electrochemical reactions at the polymer-oxide interface that lead to premature failure. 51,52 In all cases, precoating the metal surfaces, which results in more intimate interfacial contact at the interface, is expected to reduce the effects of environment as the environmental species is sterically hindered from reaching the fracture process zone.…”

Section: Discussionmentioning

confidence: 99%

Effects of fatigue loading and PMMA precoating on the adhesion and subcritical debonding of prosthetic-PMMA interfaces

Ohashi

Dauskardt

2000

J. Biomed. Mater. Res.

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Debonding of clinically relevant CoCrMo-polymethylmethacrylate (PMMA) interfaces is shown to occur subcritically under fatigue loading, implying that debonding may occur at loads much lower than those required for catastrophic failure. Interface fracture mechanics samples containing precoated and uncoated grit-blasted CoCrMo substrates and a PMMA layer were constructed and quantitatively evaluated in terms of their critical interface adhesion and subcritical debond behavior. The precoat surfaces had markedly enhanced adhesion and fatigue resistance in both air and simulated physiological environmental conditions compared to the uncoated samples. Constraint of the PMMA layer does not significantly affect the debond process for thickness between 2- and 5-mm. In addition, wear particles were collected and shown to be consistent with particle sizes reported in vivo and are on the scale of the metal surface roughness. Life prediction methods using the subcritical debond-growth data are discussed.

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Section: Discussionmentioning

confidence: 99%

Effects of fatigue loading and PMMA precoating on the adhesion and subcritical debonding of prosthetic-PMMA interfaces

Ohashi

Dauskardt

2000

J. Biomed. Mater. Res.

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“…Most bond durability studies have involved the exposure of bonded joints with processing or material variations (e.g., surface treatment or adhesive chemistry) to hygrothermal environments, characterizing post-failure surfaces and comparing bond performance (see, for example, [1][2][3][4][5][6][7][8][9][10][11][12][13]). There was no practical means of measuring the ingress of moisture into the bondline prior to bond failure.…”

Section: Introductionmentioning

confidence: 99%

Detection of Moisture in Adhesive Bonds Using Electrochemical Impedance and Dielectric Spectroscopies

Davis¹,

Pethrick

Doyle

2009

Journal of Adhesion Science and Technology

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The ingress of moisture into an adhesive bonded structure can lead to a variety of effects. Moisture has the ability to plasticize the adhesive but may also segregate into microvoids. The water in the voids will have less of an effect as it does not plasticise the matrix and is unable to influence the interface between the resin and the substrate. Only if the T g of the matrix drops below ambient will it allow expansion of the voids and then there will be consequential lowering of the fatigue characteristics of the resin. Water also has the ability to interact with metallic surfaces leading to changes in the nature of the interaction between adhesive and adherend. Water has a large dipole signature and is easily studied in terms of its effect on the electrical properties of bonded joint structures. In this paper, applications of electrochemical impedance and dielectric spectroscopies are described. Both techniques measure the electrical response of the joint, however the nature of the measurement performed allows slightly different, but complementary, approaches to be adopted. Application of the techniques to similar joint structures illustrates the similarities and differences of the two approaches. The article demonstrates the value of using electrical methods to probe the changes that occur in joints on ageing and emphasizes the value of these methods in developing and understanding of the phenomena that are responsible for loss of bond integrity.

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“…Unlike aluminum and titanium, iron does not form coherent, adherent oxides, so it is difficult to replicate the fine microroughness needed for good adhesion found on other substrate materials. Although various chemical etchants have been tried for both low carbon and stainless steels for many years, none has been widely adopted or shown to be superior to grit blasting [14]. One traditional etching chemical for aluminum bonding was considered in this study: Pasa-Jell.…”

Section: Chemical Interlockingmentioning

confidence: 99%

Development of bonded composite doublers for the repair of oil recovery equipment.

Roach¹,

Rackow²

2005

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An unavoidable by-product of a metallic structure's use is the appearance of crack and corrosion flaws. Economic barriers to the replacement of these structures have created an aging infrastructure and placed even greater demands on efficient and safe repair methods. In the past decade, an advanced composite repair technology has made great strides in commercial aviation use. Extensive testing and analysis, through joint programs between the Sandia Labs FAA Airworthiness Assurance Center and the aviation industry, have proven that composite materials can be used to repair damaged aluminum structure. Successful pilot programs have produced flight performance history to establish the durability of bonded composite patches as a permanent repair on commercial aircraft structures. With this foundation in place, this effort is adapting bonded composite repair technology to civil structures. The use of bonded composite doublers has the potential to correct the difficulties associated with current repair techniques and the ability to be applied where there are no rehabilitation options. It promises to be cost-effective with minimal disruption to the users of the structure. This report concludes a study into the application of composite patches on thick steel structures typically used in mining operations. Extreme fatigue, temperature, erosive, and corrosive environments induce an array of equipment damage. The current weld repair techniques for these structures provide a fatigue life that is inferior to that of the original plate. Subsequent cracking must be revisited on a regular basis. The use of composite doublers, which do not have brittle fracture problems such as those inherent in welds, can help extend the structure's fatigue life and reduce the equipment downtime. Two of the main issues for adapting aircraft composite repairs to civil applications are developing an installation technique for carbon steel and accommodating large repairs on extremely thick structures. This study developed and proved an optimum field installation process using specific mechanical and chemical surface preparation techniques coupled with unique, in-situ heating methods. In addition, a comprehensive performance assessment of composite doubler repairs was completed to establish the viability of this technology for large, steel structures. The factors influencing the durability of composite patches in severe field environments were evaluated along with related laminate design issues.

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Adherend Surface Preparation for Structural Adhesive Bonding

Cited by 24 publications

References 50 publications

Effects of fatigue loading and PMMA precoating on the adhesion and subcritical debonding of prosthetic-PMMA interfaces

Effects of fatigue loading and PMMA precoating on the adhesion and subcritical debonding of prosthetic-PMMA interfaces

Detection of Moisture in Adhesive Bonds Using Electrochemical Impedance and Dielectric Spectroscopies

Development of bonded composite doublers for the repair of oil recovery equipment.

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