Fracture toughness and shear behavior of composite bonded joints based on a novel aerospace adhesive

Katsiropoulos, Ch.V.; Chamos, Apostolos; Τσερπές, Κωνσταντίνος; Pantelakis, Spiros

doi:10.1016/j.compositesb.2011.07.010

Cited by 82 publications

(40 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The Teflon ® film of 0.085 mm thickness was also inserted between the two plates, in the middle of the total laminate to simulate an initial crack and the entire system returned to the autoclave to cure the adhesive accordingly to the material data sheet specifications 14 . Therefore, in the co-bonded laminate, only one of the [0 o ] 13 laminates is post-cured, whereas in the secondary bonding, both sides are post-cured in the autoclave.…”

Section: Samples Preparationmentioning

confidence: 99%

Mode I Interlaminar Fracture Toughness Analysis of Co-Bonded and Secondary Bonded Carbon Fiber Reinforced Composites Joints

et al. 2018

View full text Add to dashboard Cite

Aiming to reduce aircraft weight, aeronautic industry seeks alternative materials and processes used to join its different structural parts. An option to traditional methods are high performance adhesive joints, which reduce weight, number of parts and component final cost, also resulting in higher strength structures. Although, the lack of experimental data to provide a detailed structural characterization of these joining techniques had limited their commercial application. The proposal of this work is to investigate the Mode I interlaminar fracture toughness under quasi-static loading using DCB specimens of carbon composite joints made by co-bonding and secondary bonding techniques, the latter giving more reliable results. For a better understanding on the failure in the systems, DSC and microscopy techniques were applied, from which three stages of delamination process during testing were observed: 1 st Stage) Cohesive failure represented by an unstable crack propagation from a high energy level; 2 nd Stage) transition from cohesive to adhesive and final intralaminar failure mode with lower energy levels than Stage 1; and 3 rd Stage) completely stable propagation at low energy levels (delamination migrates from intralaminar to interlaminar, entirely in the substrate).

show abstract

Section: Samples Preparationmentioning

confidence: 99%

Mode I Interlaminar Fracture Toughness Analysis of Co-Bonded and Secondary Bonded Carbon Fiber Reinforced Composites Joints

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The effect of wet-ageing for mode I is the increase of the GIc for both adhesives with a thickness of 0.5mm. Furthermore, a decreasing of mode II is verified in consequence of the water uptake for LMB adhesive for thickness 1 [8].…”

Section: Fracture Toughnessmentioning

confidence: 99%

“…However, the difficulties with surface preparation and problems envolving environmental durability make adhesive bonding a non general solution in the aircraft industry [8]. Nowadays, the evolution of the technology increases adhesive applications to more than 345 bonding features in the entire aircraft families.…”

Section: Aeronautical Industrymentioning

confidence: 99%

See 1 more Smart Citation

Determination of the fracture envelope of an adhesive joint as a function of moisture

Rodrigues¹,

Chaves

Silva³

et al. 2017

Materialwissenschaft Werkst

View full text Add to dashboard Cite

Adhesively joints are increasingly being used in aerospace, automotive and maritime industries.The use of this type of joining provides some advantages such as reduction in weight and cost.However, adhesive joints in transportation industry may be exposed to aggressive environments such as high humidity during their service life. A particular issue with the reliability of adhesive joints is the presence of cracks and flaws. Fracture mechanics tests for adhesive joints provide relevant mechanical properties to determine the adhesive toughness and play an important role in design process.This research aims to determine the fracture toughness of aluminum/adhesive/aluminum joints under pure mode I, pure mode II and mixed mode loadings. The fracture characterization of adhesively joints was performed when these specimens were submitted to mixed mode loadings and pure modes (shear and opening). The experimental tests Double Cantilever Beam (DCB) and End-Notched Flexure (ENF) were also done in order to assess the fracture toughness in pure modes I and II, respectively. A mixed mode apparatus was used to perform the mixed mode tests from pure mode I to near mode II. Test for dry and wet condition were performed with the main purpose to predict the influence of humidity in the toughness properties. The adhesive characterized was a ductile epoxy adhesive, Nagase Chemtex ® XNR 6852E-2.The diffusion coefficient was measured and the water uptake behavior was studied for a temperature of 50 ºC. Finite element analysis (FEA) was carried out to predict the moisture content in the adhesive layer, using ABAQUS ® .The influence of water in the behavior of the adhesive joint (DCB) was verified by changes in the values of the fracture mechanics properties. The load necessary to initiate a crack propagation is lower for aged adhesive joints when compared with dry adhesive joints for pure modes and different mixed mode ratios. vi vii ResumoAs ligações adesivas são cada vez mais utilizadas na indústria aeroespacial, automóvel e naval.A utilização deste tipo de ligação fornece algumas vantagens, tais como redução do peso e do custo. Contudo, na indústria dos transportes, estas ligações podem ser expostas a ambientes agressivos, tais como ambientes com elevada humidade durante a sua vida útil. Uma questão particular é a fiabilidade das juntas adesivas na presença de fendas e falhas. Os ensaios de mecânica da fratura para juntas adesivas proporcionam propriedades mecânicas relevantes, de forma a determinar a resistência adesiva e desempenham um papel importante no processo de design de juntas.Esta pesquisa tem como objetivo determinar a tenacidade à fratura de juntas de alumínio / adesivo / alumínio em modo puro I, II e modo misto. A caracterização à fratura de juntas adesivas foi realizada quando estas estavam submetidas a cargas de modo misto e modos puros (corte e abertura). Os ensaios Double Cantilever Beam (DCB) e End-Notched Flexure (ENF)foram realizados para avaliar a resistência à fratura em modos puros I e II, respetiv...

show abstract

“…According to the 21st century demand for novel technologies and products [15] and the aforementioned current and continuous seek for lightweight resistant materials, fibers and composites are undoubtedly a strong alternative for supplying this demand with successful performance on acute applications [16][17][18][19]. In turn, with respect to Carbon Fiber Reinforced Polymers (CFRP) specifically, the application on automotive field is thoroughly consolidated since the Formula 1 pioneering success in 1981, proposing a carbon fiber composite monocoque chassis [20].…”

Section: Carbon Fibermentioning

confidence: 99%

Analysis of the suspension design evolution in solar cars

De¹,

Fragassa²,

Pavlović³

et al. 2017

FME Transaction

View full text Add to dashboard Cite

Fracture toughness and shear behavior of composite bonded joints based on a novel aerospace adhesive

Cited by 82 publications

References 15 publications

Mode I Interlaminar Fracture Toughness Analysis of Co-Bonded and Secondary Bonded Carbon Fiber Reinforced Composites Joints

Mode I Interlaminar Fracture Toughness Analysis of Co-Bonded and Secondary Bonded Carbon Fiber Reinforced Composites Joints

Determination of the fracture envelope of an adhesive joint as a function of moisture

Analysis of the suspension design evolution in solar cars

Contact Info

Product

Resources

About