Influence of material and manufacturing technology on the failure behavior of composite laminate bonded joints

Moroni, F.; Pirondi, A.; Pernechele, C.; Vescovi, Luca; Collini, Luca

doi:10.1016/j.prostr.2019.08.195

Cited by 2 publications

(4 citation statements)

References 1 publication

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“…Some parameters of the laminated composite material necessary for the study were partly determined in previous works [ 16 , 17 ] and are reported in Table 2 .…”

Section: Methodsmentioning

confidence: 99%

“…Before testing, the adhesive was left to cure for at least 24 h at room temperature and was then post-cured according to the technical data sheet guidelines. Some parameters of the laminated composite material necessary for the study were partly determined in previous works [16,17] and are reported in Table 2.…”

Section: Materials and Specimen Manufacturingmentioning

confidence: 99%

“…This work is part of a larger experimental campaign that has the objective of gaining an in depth understanding of the behavior of adhesive joints, hybrid and non-hybrid, with composites that have different epoxy matrices, taking into account different manufacturing routes (co-curing, co-bonding, cold-bonding). Works have already been published concerning composite-composite joints in terms of co-curing vs. co-bonding [16] and different epoxy resins (co-bonded joints only) [17].…”

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confidence: 99%

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Comparison of Tensile Strength and Fracture Toughness of Co-Bonded and Cold-Bonded Carbon Fiber Laminate-Aluminum Adhesive Joints

Moroni

Pirondi

Pernechele³

et al. 2021

Materials

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The purpose of this work is to compare the co-bonding vs. cold-bonding route on the adhesive joint performance of a CFRP (Carbon Fiber Reinforced Polymer) laminate–aluminum connection. In particular, the overlap shear, tensile strength and Mode I and Mode II fracture toughness will be evaluated. The adhesives for co-bonding and cold-bonding are, respectively, a thermosetting modified epoxy, unsupported structural film and a two-component epoxy adhesive, chosen as representative of applications in the high-performance/race car field. The emerging trend is that, in tensile e Mode I fracture tests, the failure path is predominantly in the composite. Mode II fracture tests instead resulted in a cohesive fracture, meaning that, under pure shear loading, the weakest link may not be the composite. The lap-shear tests are placed midway (cohesive failure for co-bonding and composite delamination for cold-bonding, respectively), probably due to the different peel stress values related to the different adhesive Young’s modulus. The exploitation of the full capacity of the adhesive joint, hence the possibility of highlighting better, different performances of co-bonding vs. cold-bonding, would require consistent improvement of the out-of-plane strength of the CFRP laminate and/or to someway redistribute the peel stress on the bondline.

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“…Some parameters of the laminated composite material necessary for the study were partly determined in previous works [ 16 , 17 ] and are reported in Table 2 .…”

Section: Methodsmentioning

confidence: 99%

Section: Materials and Specimen Manufacturingmentioning

confidence: 99%

mentioning

confidence: 99%

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Comparison of Tensile Strength and Fracture Toughness of Co-Bonded and Cold-Bonded Carbon Fiber Laminate-Aluminum Adhesive Joints

Moroni

Pirondi

Pernechele³

et al. 2021

Materials

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“…According to Gilman's strength formula, the theoretical ultimate tensile strength of carbon fiber is 180 GPa, yet the actual fracture strength of this material falls significantly below that value. For instance, Toray's excellent T1100G currently exhibits a tensile strength of only 7.0 GPa [5]. In recent years, the structural reinforcement of carbon fibers has been studied mainly for surface defects, such as carbon nanotubes [6,7], silica [8], titanium dioxide [9], metal-organic frameworks [10], and other nanomaterials have all been used extensively in recent years for the modification of carbon fibers.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of carbon fibers: γ-irradiation induced microporous modulation and surface defect repairing with graphene quantum dots

Shao,

Zhou,

Wang

et al. 2024

J. Phys. D: Appl. Phys.

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Due to the presence of numerous defects both internally and on the surface, carbon fiber exhibits mechanical properties far below theoretical predictions. Finding a rapid and effective method for reinforcing the matrix remains a challenge. To address this, we have conducted structural reinforcement of carbon fiber by improving the orientation of internal micropores and eliminating surface defects. On the one hand, we subjected the carbon fiber to a dose of 100 kGy of gamma-ray irradiation in the air. After testing, the mechanical properties of the carbon fiber improved by 5.59 %. Analysis using techniques such as Small-angle X-ray scattering (SAXS) revealed that gamma rays can slightly alter the orientation of the fiber’s internal micropores and enhance graphitization to some extent. On the other hand, we introduced graphene quantum dots (GQDs) onto the surface of the carbon fiber using electrostatic spraying and electrophoretic deposition techniques to fill the defect sites. Compared to untreated carbon fiber, the mechanical properties improved by 10.65 % and 9.40 % when GQDs were grafted using electrophoretic deposition and electrostatic spraying methods, respectively. This improvement can be attributed to the adsorption of GQDs on the surface of the carbon fiber, which disperses stress during tensile loading and delays fracture. Finally, grafting of GQDs onto the surface of gamma-irradiated carbon fibers by electrophoresis improved the mechanical properties of the carbon fibers by 15.53% compared to unmodified carbon fibers. This work provides a more comprehensive perspective for repairing carbon fiber structures.

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Influence of material and manufacturing technology on the failure behavior of composite laminate bonded joints

Cited by 2 publications

References 1 publication

Comparison of Tensile Strength and Fracture Toughness of Co-Bonded and Cold-Bonded Carbon Fiber Laminate-Aluminum Adhesive Joints

Comparison of Tensile Strength and Fracture Toughness of Co-Bonded and Cold-Bonded Carbon Fiber Laminate-Aluminum Adhesive Joints

Reinforcement of carbon fibers: γ-irradiation induced microporous modulation and surface defect repairing with graphene quantum dots

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