Stress analysis at the interface of metal-to-metal adhesively bonded joints subjected to 4-point bending: Finite element method

Prathuru, Anil; Faisal, Nadimul Haque; Jihan, Sha; Steel, John Alexander; Njuguna, James

doi:10.1080/00218464.2016.1172309

Cited by 5 publications

(2 citation statements)

References 20 publications

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“…It is expected that practically, any specimens prepared will be unique (if prepared individually), and ideally speaking, it can be difficult to maintain the specimens' quality uniform throughout. However, while investigating series of 4-point bending failure of Al-to-Al adhesively bonded joints using the same adhesives (brittle: Loctite® EA3430 TM ; ductile: Loctite® AA326 TM ) and 250 µm bond thickness [37], the investigators indicated that under two test runs, there was good agreement between the finite element simulation and the experimental results. These repeatability issue can vary depending on the nature of the adhesive i.e.…”

Section: Discussionmentioning

confidence: 99%

Acoustic emission method to study fracture (Mode-I, II) and residual strength characteristics in composite-to-metal and metal-to-metal adhesively bonded joints

Droubi

Stuart

Mowat

et al. 2017

The Journal of Adhesion

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Failure behaviour of two types of adhesively bonded joints (composite-to-metal, metal-to-metal) has been studied under failure modes (Mode I: double cantilever beam (DCB) and Mode II: three-point end notch flexures (3-ENF)) using acoustic emission (AE) technique. The bonded specimens were prepared using two types of adhesive bond materials with three variations of adhesive bond quality. The effect of the presence of interfacial defects along the interface on the residual strength of the joint has also been studied. It was possible using the maximum AE amplitude method to select the AE events of mechanical significance. However, it proved difficult to propose a definitive AE trait for the mechanical phenomena occurring within specific AE event signals, for all adhesive types, bond qualities, and substrate configurations; therefore, all specimen combinations. There was a notable shift in spectral energy proportion as the AE source of mechanical significance varied along the specimen length for specimen combinations. However, it was difficult to confirm this distinctive trait for all specimen combinations due to difficulty in confirming the location and exact mechanical source. The proposed measurement technique can be useful to assess the overall structural health of a bonded system and may allow identification of defects.

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Section: Discussionmentioning

confidence: 99%

Acoustic emission method to study fracture (Mode-I, II) and residual strength characteristics in composite-to-metal and metal-to-metal adhesively bonded joints

Droubi

Stuart

Mowat

et al. 2017

The Journal of Adhesion

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“…Their results concluded that the FE/CZM and experimental validation method worked well in Mode-I cases, but in Mode-II and mixed mode cases, modifications to the CZM parameters were needed to obtain satisfactory results. Similar procedures of experimental CZM validation were implemented by Prathuru et al [6]. These studies highlighted the usefulness of these methods but they are not specifically applied to the composite to adhesive bonds found in wind turbine applications.…”

Section: Introductionmentioning

confidence: 99%

Indentation based strength analysis of adhesively bonded leading-edge composite joints in wind turbine blades

et al. 2019

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Wind turbine is a source of non-polluting renewable energy. Whether a wind turbine is viable depends entirely on the structural integrity of turbine blade. To assess the structural integrity of wind turbine blades it is necessary to investigate the loading behaviour of adhesively bonded composite joints. Finite element along with cohesive zone modelling (CZM) methods were implemented to investigate the elastic indentation contact of adhesively bonded leading-edge composite joints in wind turbine blades. The CZM was validated by replicating existing experimental and numerical work on composite-to-adhesive bonds applied to wind turbine structures. This validated model was then used to investigate the structural integrity of a variety of leading-edge joint configurations, adhesive thicknesses and bond finishes under indentation. Numerical results showed that an off-centre adhesive joint configuration was desirable and capable of withstanding between 39 and 96% more load than centred joints. Direct indenter to adhesive contact was shown to reduce fracture resistance by up to 4.7%. An adhesive joint based on a lap joint configuration was proposed as an alternative to current designs. Keywords Wind turbine blade • Adhesive joints • Stress analysis • Finite element method • Indentation Abbreviations CFRP Carbon fibre reinforced polymers CZM Cohesive zone model DCB Double cantilever beam ENF End-notch flexure FE Finite element GFRP Glass fibre reinforced polymers VCCT Virtual crack closure technique List of symbols E Elastic modulus F s Slow down force G C Critical fracture energy release rate G IC Critical fracture energy release rate (Mode I) G IIC Critical fracture energy release rate (Mode II) G IIIC Critical fracture energy release rate (Mode III) G I Fracture energy release rate (Mode I) G II Fracture energy release rate (Mode II) G III Fracture energy release rate (Mode III) K c Stress intensity factor (fracture toughness) m Mass s Slow down distance v Velocity n

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Improvement of scarf repair patch shape for composite aircraft structures

Vadean

Abusrea

Shazly

et al. 2022

The Journal of Adhesion

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Stress analysis at the interface of metal-to-metal adhesively bonded joints subjected to 4-point bending: Finite element method

Cited by 5 publications

References 20 publications

Acoustic emission method to study fracture (Mode-I, II) and residual strength characteristics in composite-to-metal and metal-to-metal adhesively bonded joints

Acoustic emission method to study fracture (Mode-I, II) and residual strength characteristics in composite-to-metal and metal-to-metal adhesively bonded joints

Indentation based strength analysis of adhesively bonded leading-edge composite joints in wind turbine blades

Improvement of scarf repair patch shape for composite aircraft structures

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