Mechanical properties of composite T-joints subjected to laser ablation

Luo, Chuyang; Wang, Shuai; Li, Weidong; Zhang, Liying; Pan, Liqing

doi:10.1016/j.compstruct.2022.115791

Cited by 6 publications

(2 citation statements)

References 36 publications

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“…The impact of CNT on the initial stiffness of T‐joint was not evident. The peak area reflects the energy absorbed in sample breakage, representing the sample toughness during the pull‐off test 31,32 . Compared to J‐272 film sample, the toughness of sample with 0.5 wt% CNT increased 75.3%.…”

Section: Resultsmentioning

confidence: 99%

Aminated carbon nanotube enhanced composite T‐joints mediating CFRP load‐bearing capacity improvement

Bai,

Yan,

et al. 2023

Polymer Composites

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Adhesive bond is the weakest part of carbon fiber reinforced composites (CFRP) force‐bearing structure. Therefore, enhancing the strength of the adhesive bond is key to improve force‐bearing structure. In this study, adhesive strength of the common CFRP T‐joint was enhanced by aminated carbon nanotubes (CNT). To begin with, shear tensile strength of single‐lap‐joint laminated composites with various CNT content was verified, which peaked at 0.5 wt%. It was indicated that the adhesive bond of deltoid is the weakest area in a T‐joint. CNT was applied in the deltoid of composite T‐joint and pull‐off test was conducted to investigate the progress from the initiation and evolution of damage as well as the final failure. The aminated CNT employed in this study formed an effective load transmission through physical engagement and chemical bonding; the addition of 0.5 wt% CNT effectively enhanced tensile strength and toughness, improving mechanical property of the adhesive bond. This study provides a solution to enhance the adhesive area of CFRP load‐bearing structure with CNT, consequently improve the load‐bearing strength of composite.Highlights Aminated CNT is substantially improve the adhesive strength of CFRP T‐joint. Tensile strength and toughness of T‐joint deltoid was optimized by 0.5 wt% CNT. Effective load transmission through physical engagement and chemical bonding.

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Section: Resultsmentioning

confidence: 99%

Aminated carbon nanotube enhanced composite T‐joints mediating CFRP load‐bearing capacity improvement

Bai,

Yan,

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

show abstract

“…Furthermore, bending loads can be subjected at the joint. Various solutions to this problem have been proposed, usually in the form of T-joint structures [1,4,5].…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Mechanical Properties of Composite T-Joints with Defects under Bending Loading

et al. 2022

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The composite T-joint, a typical structural element, is widely used in the fields of aerospace due to their excellent mechanical properties. However, several defects might occur in this material during manufacturing because of the application of co-curing and co-bonding technologies. The existence of the defects results in the reduction in the load bearing capacity, which negatively affects the safety of the structure. In this study, a finite element (FE) model of composite T-joints is established, which is verified by quasi-static tests to investigate the load bearing capacity and failure modes of composite T-joints under bending loadings with different types of defects, including core material defects, radius floating of the fillet, and debonding defects. It is indicated that the failure modes of T-joints with different kinds of defects under bending loadings are similar, i.e., the delamination occurs firstly at the interface between the filling area and the L-rib before expanding to both sides. Meanwhile, the types of defects exert great effects on the load bearing capacity of T-joints, and the debonding defects in the arc area represent the most dangerous one. Furthermore, the orthogonal test method was adopted to analyze the influence of combined defects on the load bearing capacity of T-joints, and the findings reveal that the most sensitive type of defect is the debonding defects, followed by the radius floating of the fillet, and then core material defects. This result indicates that combined defects have a coupling effect on the load bearing capacity of composite T-joints. This study provides theoretical guidance and technical support for the repair of the defects of composite T-joints.

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Thermal-mechanical-chemical coupled model and three-dimensional damage evaluation based on computed tomography for high-energy laser-ablated CFRP

Li,

Chen,

Duan

et al. 2024

Composites Science and Technology

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Mechanical properties of composite T-joints subjected to laser ablation

Cited by 6 publications

References 36 publications

Aminated carbon nanotube enhanced composite T‐joints mediating CFRP load‐bearing capacity improvement

Aminated carbon nanotube enhanced composite T‐joints mediating CFRP load‐bearing capacity improvement

Investigations on the Mechanical Properties of Composite T-Joints with Defects under Bending Loading

Thermal-mechanical-chemical coupled model and three-dimensional damage evaluation based on computed tomography for high-energy laser-ablated CFRP

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