Mode I tensile fracture behavior of adhesively-bonded metal–metal, metal–CFRP, and CFRP–CFRP bi-material combinations analyzed by size effect method

Qiao, Yao; Merkel, Daniel R.; Nickerson, Ethan; Shin, Yongsoon; Seffens, Robert J.; Ortiz, Ángel L.; Simmons, Kevin L.

doi:10.1016/j.compositesa.2022.107025

Cited by 15 publications

(7 citation statements)

References 50 publications

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“…The development of joining technologies, including mechanical joining, welding, screw and rivet connection, and adhesive bonding, has driven the application of CFRP in engineering [ 4 , 5 ]. In the fabrication of CFRP structural components for aerospace applications, adhesive-bonding technology offers many advantages over other joining technologies [ 6 , 7 ]. The use of adhesive-bonding technology can reduce the weight of structural components, improve manufacturing efficiency, reduce manufacturing costs, and avoid stress concentration caused by drilling and structural damage to CFRP [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Epoxy-Modified Bismaleimide Structural Adhesive Film Toughened Synergistically with PEK-C and Core–Shell Polymers for Bonding CFRP

Zhao

Xiao

et al. 2023

Polymers

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Bismaleimide (BMI) resin-based structural adhesives have excellent heat resistance, with important applications demonstrated in the bonding of high-temperature BMI composites. In this paper, we report an epoxy-modified BMI structural adhesive with excellent properties for bonding BMI-based CFRP. We prepared the BMI adhesive using epoxy-modified BMI as the matrix and PEK-C and core–shell polymers as synergistic tougheners. We found that the epoxy resins improve the process and bonding properties of BMI resin but slightly reduce thermal stability. PEK-C and core–shell polymers synergistically improve the toughness and bonding performances of the modified BMI adhesive system and allow the maintenance of heat resistance. The optimized BMI adhesive exhibits excellent heat resistance, with a high glass transition temperature of 208.6 °C and a high thermal degradation temperature of 425.4 °C. Most importantly, the optimized BMI adhesive exhibits satisfactory intrinsic bonding and thermal stability. It has a high shear strength of 32.0 MPa at room temperature and up to 17.9 MPa at 200 °C. The BMI adhesive-bonded composite joint has a high shear strength of 38.6 and 17.3 MPa at room temperature and 200 °C, respectively, indicating effective bonding and excellent heat resistance.

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Section: Introductionmentioning

confidence: 99%

Epoxy-Modified Bismaleimide Structural Adhesive Film Toughened Synergistically with PEK-C and Core–Shell Polymers for Bonding CFRP

Zhao

Xiao

et al. 2023

Polymers

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“…Understanding fracture mechanisms plays an essential role in the design and integrity of structural reliability leading to the characterization of fracture performance of composite-metal adhesively bonded structures becoming a new research field. 9,10 Generally, the fracture modes can be divided into the opening mode (mode I), sliding shear mode (mode II), and tearing shear mode (mode III). It must be emphasized that mode II fracture is vital for adhesive structures because that crack often propagates in the parallel direction of constraint due to the constraint of adherends.…”

Section: Introductionmentioning

confidence: 99%

“…The fracture mechanism of this kind of structure is relatively different from that of traditional one‐material adhesively bonded structures due to the stiffness difference and so on. Understanding fracture mechanisms plays an essential role in the design and integrity of structural reliability leading to the characterization of fracture performance of composite‐metal adhesively bonded structures becoming a new research field 9,10 …”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation on test methods for mode II fracture of composite‐titanium adhesively bonded structures

Wang

Ding

Jiang

et al. 2023

Fatigue Fract Eng Mat Struct

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The investigation on fracture test methods for dissimilar materials adhesively bonded structures is urgent. In this study, three mode II fracture test methods for composite‐titanium adhesively bonded structures are experimentally and numerically studied. A manual inverse fitting method is adopted to obtain accurate cohesive models, and sensitivity evaluation of test methods is comprehensively conducted. The results show that GII of the experimental end‐notched flexure (ENF) test is nearly 20% greater than end‐loaded split (ELS). The effect of friction can be ignored, while all methods are highly dependent on the adherend's thickness, especially the maximum deviation of ELS that is 23.74%. In addition, the condition that the adherend with smaller flexural stiffness places outside the bending direction should be avoided to achieve mode II dominant possibly. In summary, the ENF test method with span length of 100 mm and small adherend's thickness is recommended for the mode II fracture test of the dissimilar materials adhesively bonded structures.

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“…[14][15][16][17][18][19][20] Nevertheless, fracture of the adhesively bonded structures often leads to catastrophic failure, which results in the study on fracture of the bi-material interface is always the focus of the design for composite-metal adhesively bonded structures. 21,22 In addition, the adhesively bonded structures serving in the marine environment (high humidity, high salt, high-temperature difference) are highly susceptible to environmental effects causing inevitable changes in their performance. The service reliability, safety, and durability will be severely reduced.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the development of high‐strength adhesive, the advantages of lightweight, corrosion resistance, and high load‐transferring lead to adhesive joints becoming a potential selection for the connection of structures ranging from small components such as masts, piping, and bulkheads to larger structures such as ship hulls, superstructures or offshore, and submersibles structure modules 14–20 . Nevertheless, fracture of the adhesively bonded structures often leads to catastrophic failure, which results in the study on fracture of the bi‐material interface is always the focus of the design for composite–metal adhesively bonded structures 21,22 . In addition, the adhesively bonded structures serving in the marine environment (high humidity, high salt, high‐temperature difference) are highly susceptible to environmental effects causing inevitable changes in their performance.…”

Section: Introductionmentioning

confidence: 99%

Fracture durability of composite–titanium adhesively bonded structures exposed to seawater environment

Wang,

Gao,

et al. 2023

Fatigue Fract Eng Mat Struct

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In this paper, the fracture durability of composite–titanium adhesively bonded structures exposed to seawater environment was studied experimentally and numerically. The specimens were immersed in artificial seawater at 45°C for different exposure times. The results show that the tensile strength of the specimen aging for 130 days degraded by nearly 55.6%, and the degradation of the mechanical properties of adhesive was not only affected by the moisture but also showed a certain relationship with aging time. Under the condition of saturated moisture, the tensile strength of the specimen still decreased with the increase of aging time. The simulated moisture results of the aging fracture specimen indicate that the moisture of the boundary region of the adhesive layer was mainly absorbed from the adhesive itself, while the moisture of the central region was dependent on the moisture absorption of the composite adherend. Moreover, the moisture absorption of the pre‐crack tip adhesive resulted in different load responses and fracture modes of the aging fracture specimens. Consequently, the fracture toughness of the DCB and ENF specimens aging for 180 days degraded by nearly 66.4% and 33.0%, respectively.

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Mode I tensile fracture behavior of adhesively-bonded metal–metal, metal–CFRP, and CFRP–CFRP bi-material combinations analyzed by size effect method

Cited by 15 publications

References 50 publications

Epoxy-Modified Bismaleimide Structural Adhesive Film Toughened Synergistically with PEK-C and Core–Shell Polymers for Bonding CFRP

Epoxy-Modified Bismaleimide Structural Adhesive Film Toughened Synergistically with PEK-C and Core–Shell Polymers for Bonding CFRP

Experimental and numerical investigation on test methods for mode II fracture of composite‐titanium adhesively bonded structures

Fracture durability of composite–titanium adhesively bonded structures exposed to seawater environment

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