Fatigue performances and reliability analysis of fatigue life for scarf-repaired composite laminates

Feng, Wei; Xu, Fei; Xie, Wei; Zhang, Meng

doi:10.1080/00218464.2020.1834389

Cited by 8 publications

(4 citation statements)

References 44 publications

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“…In the recent years, reliability of bonded composite joints and uncertainties in those structures elaboration were reviewed [117,118]. Limited work was done on probabilistic assessment of flush repairs strength [119,120,121]. Simple methodologies were provided in order to take in account stochastic variations for the material and geometrical properties as well as the external loading.…”

Section: Reliability and Durabilitymentioning

confidence: 99%

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

Orsatelli

Paroissien

Lachaud

et al. 2023

Composite Structures

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Section: Reliability and Durabilitymentioning

confidence: 99%

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

Orsatelli

Paroissien

Lachaud

et al. 2023

Composite Structures

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“…It is a desired result in sandwich repair process that the honeycomb core mass can be in the optimum range of 50%-66.7% of the whole sandwich panel mass. 7 Studies about repair procedures on fibre reinforced polymer composite laminated beams or panels and their mechanical and damage analysis under various loadings such as bending, buckling, impact [8][9][10][11][12][13][14][15][16] and even fatigue 17 are worthy and similar with sandwich repair to a certain extent. Since the sandwich material is not in the form of a conventional laminated composite structure and if the sandwich core is also damaged and needs repair, these studies about laminated composite structures should be evaluated in a different category.…”

Section: Introductionmentioning

confidence: 99%

A case study on the performance of repaired sandwich composite aeronautical structures in different failure characteristics under bending loading

Süsler

AVŞAR²,

Türkmen

2023

Journal of Composite Materials

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It is important to develop composite repair methods and investigate their performance against in-service and severe conditions due to high cost of composites, current environmental conscience and difficulties in composite recycling. In this study, the performance of various repair methods applied to two different types of polymer sandwich composite panels made of identical aramid honeycomb core, which are actively used in aerospace structures, is investigated. It is aimed to obtain different failure characteristics and to investigate the effects of these failure modes on the performance of repair methods for two different facesheet types. Three-point bending tests are configured for the flexural performance of repaired sandwich structures in the case of damage modes of core-facesheet adhesive bonded joint delamination and core damage and facesheet failure. The load carrying capacity is measured by calculating the ultimate value of core shear stress and facing stress. The results show that the configured three-point bending procedure is effective to analyse different span regions and to have various failure characteristics. The repaired samples succeed between 80% and 112% in the load capacity. It is proved that repaired specimens have higher load carrying capacity if facesheet based failure due to facing ultimate normal stress is occurred against delamination and core failure due to core shear stress. In addition to this, a modified epoxy filling/patch repair method for sandwich structures made of honeycomb core which can increase the load carrying capacity significantly is presented.

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“…In wet conditions, composite laminates with a polymer matrix (such as epoxy, polyurethane and vinyl ester) uptake moisture by a diffusion process, which can drastically affect the mechanical and chemical properties of these materials. [6][7][8][9][10][11][12] The fluctuation of temperature and moisture absorption can create dimensional variation in laminated composites with epoxy matrix known as hygrothermal effects. 13 Accordingly, the analysis of the aging of composite materials is of great importance.…”

Section: Introductionmentioning

confidence: 99%

Cyclic aging analysis of CFRP and GFRP composite laminates

Moazzami

Ayatollahi

Akhavan‐Safar

et al. 2023

Journal of Composite Materials

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When a composite laminate is subjected to humidity, moisture diffusion occurs depending on the number and thickness of the lamina. Water diffusion changes the mechanical response of laminates and usually causes a significant reduction of the mechanical properties of the composite specimens in ocean structures. One of the most important mechanical properties of laminates is flexural stiffness which should be considered in the design procedure. Despite the extensive research on single cycle aging of composites, cyclic aging of these materials is less explored. The aim of the current research is to investigate the variation of mechanical properties of carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) composites as a substrate in adhesive joints with the same initial flexural stiffness values subjected to cyclic wet/dry aging conditions for long-term structural applications. The matrix used in the CFRP and GFRP composites are based on epoxy and vinyl ester, respectively. Both unaged and cyclically aged samples were characterized by tensile and three-point bending tests. In order to simulate the moisture absorption condition of composites in adhesive joints, one side of the composite laminates was sealed with aluminum foils and three sides were exposed to humidity. The interaction between the composite thickness and the number of aging cycles was also investigated. The experimental results show that in cyclic aging condition, the reduction of flexural stiffness in CFRP is more than GFRP laminates and GFRP laminates is more suitable for ocean applications.

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Fatigue performances and reliability analysis of fatigue life for scarf-repaired composite laminates

Cited by 8 publications

References 44 publications

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

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

A case study on the performance of repaired sandwich composite aeronautical structures in different failure characteristics under bending loading

Cyclic aging analysis of CFRP and GFRP composite laminates

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