Bonded flush repairs for aerospace composite structures: A review on modelling strategies and application to repairs optimization, reliability and durability

Orsatelli, Jean-Baptiste; Paroissien, Éric; Lachaud, Frédéric; Schwartz, Sébastien

doi:10.1016/j.compstruct.2022.116338

Cited by 23 publications

(11 citation statements)

References 127 publications

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“…Þ are residual stiffness coefficients of the fiber and matrix. The damage variables can be obtained according to Equations (1-7) and the degraded stiffness matrix, given as Equations (10)(11)(12)(13)(14).…”

Section: Constitutive Model and Failure Criteriamentioning

confidence: 99%

“…10 Scarf repair inserts the patch into the parent plate to overcome the stress concentration problem while achieving aerodynamic smoothing of the repaired surface. 11 Considering the advantages of the two methods, it is necessary to conduct a comparative study on the mechanical performance of the two methods to guide the repair strategy of laminates.…”

Section: Introductionmentioning

confidence: 99%

“…External adhesive patch repair (bonded repair) is simple but easy to produce stress concentration in the bond line, so it is often used for temporary repair or repair of thin plates 10 . Scarf repair inserts the patch into the parent plate to overcome the stress concentration problem while achieving aerodynamic smoothing of the repaired surface 11 . Considering the advantages of the two methods, it is necessary to conduct a comparative study on the mechanical performance of the two methods to guide the repair strategy of laminates.…”

Section: Introductionmentioning

confidence: 99%

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Study on the low‐velocity impact response of the repaired carbon fiber‐reinforced plastic laminates: Bonded versus scarf repair

Chen,

Peng,

Wang

et al. 2024

Polymer Composites

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Experimental and simulation studies of the response of bonded‐repaired and scarf‐repaired carbon fiber‐reinforced polymer laminates under the low‐velocity impact (LVI) were carried out. The center‐ and eccentric‐repaired laminates were prepared for experiments. The experimental results verify the validity of the finite element model in terms of the force response and different modes of damage. The effect of impact energy and the variation of repair position on the impact response of the laminate was investigated based on the benchmark model. The bonded repaired laminates have higher peak impact forces and lower energy absorption than the scarf‐repaired laminates; the damage of the bonded repaired laminate is mainly intralaminar damage and delamination damage of the patch; the adhesive of the scarf repair is prone to failure, leading to poor impact resistance. The relative positions of the impact point and the patch determine the impact response of a laminate repaired at different locations. The impact point at the edge of the patch has a detrimental effect on the repaired laminate. The impact point vertical position near the bottom hole edge of the parent plate in the scarf‐repaired case harms the impact resistance of the laminate.Highlights The low‐velocity impact response of bonded versus scarf‐repaired laminates was compared. Bonding repairs provide superior impact resistance to damaged laminates than scarf repairs. The risk of adhesive failure in scarf repair is significantly higher than in bonded repair. The relative position of the damage (repair) to the impact point critically influences the impact response. Impacts near the edge of the initial damage hole can cause severe damage to scarf‐repaired laminates.

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Section: Constitutive Model and Failure Criteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on the low‐velocity impact response of the repaired carbon fiber‐reinforced plastic laminates: Bonded versus scarf repair

Chen,

Peng,

Wang

et al. 2024

Polymer Composites

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“…Recent investigations on flush repairs focus on optimisation, durability and reliability. Beyond static behaviour, recent works were reported on damage-tolerant design for bonded repairs, along with fatigue and impact behaviour, that could raise the level of confidence associated with composite bonded repairs [7]. Relatively new technologies such as additive manufacturing also have a role to play going forward.…”

Section: Introductionmentioning

confidence: 99%

Handling, inspection and repair of aircraft composites: a pilot study on the awareness of maintenance personnel

et al. 2023

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Composite materials are enjoying an increasing use in aircraft structures. As more fleets transition from metal to more composite aircraft, the practice of maintenance is also adjusting. Handling, inspection and repair of aircraft composites following non-visible or barely visible damage are among the areas of concern, due to associated cost and safety implications. A pilot study was performed to explore the level of awareness and understanding of aviation maintenance practitioners around these issues. In addition, this research project sought to identify factors related to the technical/engineering judgement capacity of the personnel working with composites and to gauge the need for specialised education and training. A questionnaire survey was administered to a group of 40 professionals working for an aircraft maintenance, repair and overhaul (MRO) organisation. Descriptive statistics in conjunction with analysis of variance (ANOVA) were used to analyse the results. The sources of impact and common areas affected on the aircraft have been identified, with situational awareness suggested as the most important mitigator against impact damage. Over 70% of the participants would refer to their engineering manager for instructions on how to handle composite damage. The need for higher standardisation for composites’ maintenance, repair and handling issues emerged as a common theme across different sections of the survey. Almost all respondents agree on the need for specialised knowledge and training for the handling, repair and inspection of composites.

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“…In order to achieve a mature development state on composite bonded repairs, the corresponding mechanical behaviour should be investigated, exposing numerical modelling approaches, experimental techniques, and advanced optimisation methodologies. [3][4][5][6][7][8] In research, it has been demonstrated that the studies on the fracture characterisation of adhesively bonded joints, [9][10][11][12][13] can be also applied on bonded repairs.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis on the strength prediction of composite bonded repairs under different loading scenarios

Couto,

Arachchige

et al. 2023

Journal of Composite Materials

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In the last years, aeronautical industry has developed certified composite patch bonded repairs for damage tolerant structures, but only restoring metallic components. The mechanical behaviour of composite bonded repairs has been investigated since the development of composite damage tolerant structures is directly dependent on this technology. This study presents a strength prediction on carbon-epoxy adhesively repaired component, using ARALDITE® 2015 for the repairing and recurring to ABAQUS®, applying cohesive zone modelling (CZM), four different load conditions: tension, compression, upward bending and downward bending were tested. Four types of repairs are analysed: Single-Strap, Double-Strap, Scarf and Two-Stepped. The obtained results state that the Double-Strap repair withstand higher loads considering all the applied load cases when compared with the other geometries. Scarf and Two-Stepped repairs could achieve promising behaviours and they should be optimized, considering the advantages related to embedded patch repairing. Generally, the overlap length revealed to favour higher strengths, specially increasing from 5 to 10 mm. Failure paths were demonstrated, revealing proper relations with strength predictions.

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Bonded flush repairs for aerospace composite structures: A review on modelling strategies and application to repairs optimization, reliability and durability

Cited by 23 publications

References 127 publications

Study on the low‐velocity impact response of the repaired carbon fiber‐reinforced plastic laminates: Bonded versus scarf repair

Study on the low‐velocity impact response of the repaired carbon fiber‐reinforced plastic laminates: Bonded versus scarf repair

Handling, inspection and repair of aircraft composites: a pilot study on the awareness of maintenance personnel

Numerical analysis on the strength prediction of composite bonded repairs under different loading scenarios

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