Designing for damage tolerant bonded joints

Jones, Rhys; Chiu, Wing Kong; Paul, J.

doi:10.1016/0263-8223(93)90166-n

Cited by 40 publications

(25 citation statements)

References 4 publications

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“…The reference [16] observations mirror one of the primary results obtained in the damage tolerance assessment presented in this report: adhesively bonded doublers are extremely damage tolerant to large disbonds and other detrimental conditions such as impact and hot-wet conditioning. These results are quantified in Section 4 of this report.…”

Section: Doubler Design Guidelinessupporting

confidence: 73%

“…The important, fundamental results produced by Jones and Callinan in ref. [15][16] are worth reviewing in some detail in order to prepare for the damage tolerance discussions later in this report.…”

Section: Doubler Design Guidelinesmentioning

confidence: 99%

“…Thus, an increased emphasis is placed on quantifying the probability that a flaw of a particular size and location will be detected by a piece of NDT equipment. In addition to this report, detailed discussions on general damage tolerance assessments for structural repairs are presented in references [15][16][17][18][19][20].…”

Section: Doubler Design Guidelinesmentioning

confidence: 99%

“…If, in fact, disbond and delamination flaws do not grow even under extreme environmental conditions, then an acceptable design should be predicated on the fact that the stresses in the adhesive are kept below a limiting or threshold value. As a result, reference [16] introduces an essential design methodology that considers damage tolerance. It uses a fatigue threshold load, P f , and a fatigue threshold strain, ε f , below which irreversible damage in the adhesive will not occur.…”

Section: Doubler Design Guidelinesmentioning

confidence: 99%

“…Ref. [16] also describes the maximum load, P max , that can be carried by a bond in a symmetrical bonded joint as,…”

Section: Doubler Design Guidelinesmentioning

confidence: 99%

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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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Section: Doubler Design Guidelinessupporting

confidence: 73%

Section: Doubler Design Guidelinesmentioning

confidence: 99%