Torsion damage mechanisms analysis of two-dimensional braided composite tubes with digital image correction and X-ray micro-computed tomography

Gu, Yuanhui; Zhang, Diantang; Zhang, Zhongwei; Sun, Jie; Yue, Songlin; Gan, Li; Qian, Kun

doi:10.1016/j.compstruct.2020.113020

Cited by 21 publications

(9 citation statements)

References 26 publications

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“…Braid-reinforced composites are becoming alternatives to conventional composites in many industries because of their high strength and tailorable mechanical properties. 1,2 They are widely used in automobile, aerospace, sports, and marine industries owing to their high specific strength, modulus, and fatigue resistance. 3 Cylindrical braided composites consist of braid structures as reinforcements of composites.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the effect of fiber path curvature on the fracture behavior of braided composite cylinders; experimental study

Mojarrad,

Dabiryan,

Gharehaghaji

et al. 2023

Polymer Composites

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Different failure modes occur in textile‐reinforced composite under applied loads. Fracture mechanism of braided composites are closely related to the geometry of braids. In the present study, fracture mechanism of glass/epoxy braided composite cylinders is investigated under tensile loads. For this purpose, glass/epoxy braided composites were fabricated using braids with braiding angles of 30°, 45°, and 57° to find the role of fiber path on the fracture mechanism. To determine the fiber path, helixes on the cylinders with aforementioned angles was considered and analyzed. New fixtures (jaws) were designed and manufactured for tensile testing of cylindrical composites. Tensile tests were carried out on the prepared samples to evaluate the failure modes of composites. The SEM micrographs of samples are provided after tensile test. Various failure modes were observed regarding the angle of the braid. Fiber breakage, matrix fracture, and debonding are the dominant modes that occur in braided composites proportional to the angle of braids. Fiber breakage is the dominant mode in the 30° angle braid reinforced composite, while the dominant failure mode in the 57° angle braid reinforced composite is matrix fracture. In composites with a braid angle of 45°, a combination of fracture modes occurred. In addition, energy absorption as well as specific energy absorption (SEA) of braided composite cylinders were also investigated and obtained from load–displacement curves. The results showed that the reinforced composite with a braid angle of 30° absorbs the lowest amount of energy (21.5 J) and also the lowest amount of specific energy (5375 J/kg). The maximum absorbed energy (67.7 J) and the maximum SEA (9675 J/kg) were observed in the reinforced composite with a braid angle of 45°.Highlights Fiber breakage is the dominant mode at the 30° angle braid reinforced composite. The dominant failure mode at the 57° angle braid reinforced composite is matrix fracture. In composites with the braid angle of 45°, a combination of fracture modes occurred. The composite reinforced with a braid angle of 30° absorbs the lowest amount of energy (21.5 J) and also the lowest amount of specific energy (5375 J/kg). The maximum absorbed energy (67.7 J) and the maximum SEA (9675 J/kg) were observed in the reinforced composite with a braid angle of 45°.

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Section: Introductionmentioning

confidence: 99%

Analyzing the effect of fiber path curvature on the fracture behavior of braided composite cylinders; experimental study

Mojarrad,

Dabiryan,

Gharehaghaji

et al. 2023

Polymer Composites

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“…At first, the non-contact optical video system and digital image correlation method (DIC) allow the observation of inhomogeneous strain fields on the sample surface. DIC technology showed an advantage in the analysis of the stress-strain state of composite objects [53,54], the formation and propagation of cracks [55], the detection of defects, and the quantitative assessment of displacements and deformations [56]. Compared to traditional strain gauges [57] and finite element simulations [58], DIC can obtain more accurate and complete information about displacement and strain fields across the entire surface, not limited by sample geometry [59].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties Degradation of Fiberglass Tubes during Biaxial Proportional Cyclic Loading

et al. 2023

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Composite structures during an operation are subjected to various types of external loading (impact, vibration, cyclic, etc.), which may lead to a decrease in mechanical properties. Previously, many experimental investigations of the mechanical behavior of composites under uniaxial cyclic loading were carried out. Acquisition of new data on the reduction of composite materials’ mechanical characteristics under conditions of multiaxial cyclic loading, as well as verification of existing models for calculation of the residual properties, are relevant. Therefore, this work is devoted to the experimental investigation of the mechanical behavior of fiberglass tubes under proportional cyclic loading. Static and fatigue tests were carried out under tension with torsion conditions. Inhomogeneous strain fields were obtained using a non-contact optical video system VIC-3D. The structural damage accumulation processes were analyzed by an AMSY-6 acoustic emission signals recording system. Surface defects were determined using a DinoLite microscope. Residual dynamic elastic modules were calculated during fatigue tests, and fatigue sensitivity curves were built. Data was approximated using various models, and their high descriptive capability was revealed. Damage accumulation stages were determined. The dependence of the models’ parameters on a stress state were observed. It was concluded that multiaxial cyclic loading leads to a significant decrease in mechanical properties, which should be taken into account in composite structure design.

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“…[1][2][3] Therefore, composite tubular structures are extensive applied in aerospace, transport, and pressure vessels. 4,5 Despite the significant advantages of this structure in terms of lightweight and energy absorption, high manufacturing costs and complex processes pose new challenges for its large-scale application. 1,6 Moreover, it is prone to showing brittle fracture behavior when subjecting to high strain loading.…”

Section: Introductionmentioning

confidence: 99%

Failure behavior and crashworthiness characteristic of repaired composites‐metal hybrid tubes by acoustic emission

Su,

Zhang,

et al. 2023

Polymer Composites

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In this study, the transverse indentation test was applied to simulate the damage caused by impact to the carbon fiber‐reinforced plastics (CFRP)/Al hybrid tube, and composites patch repair technology was used to repair the hybrid tube with different damage degrees. The effects of width and ply‐number of the patch on failure behavior and crashworthiness under axial load were investigated. It was concluded that the technology can effectively reduce stress concentration around the indentation and then improve compressive strength. Increasing the ply‐number of the patch can mitigate the failure mode of med‐length collapse of the hybrid tube and can effectively improve the crashworthiness indicators. The optimal repair strategy increased energy absorption by 54.02% and mean crushing force by 53.66%. However, the improvement of failure behavior by the ply‐number is limited by patch width. Acoustic emission and infrared thermography technologies were used to further analyze the damage characteristics and damage evolution of the hybrid tubes in pre‐crushing stage. It was found that the crushing form of the middle collapse tended to produce a more intense acoustic emission response and higher temperature change than that of the end crushing. In engineering practice, it provides a valuable reference for the reasonable repair of composite tubular structures and their hybrid structures.Highlights Composite repair technology is used for the repair of CFRP/Al hybrid tubes. The effects of ply‐number and width of patch on repair quality are studied. The technology can effectively improve residual crashworthiness of structure. The improvement of failure behavior by ply‐number is limited by patch width. The damage behavior of various crushing forms can be revealed by AE and IR.

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Torsion damage mechanisms analysis of two-dimensional braided composite tubes with digital image correction and X-ray micro-computed tomography

Cited by 21 publications

References 26 publications

Analyzing the effect of fiber path curvature on the fracture behavior of braided composite cylinders; experimental study

Analyzing the effect of fiber path curvature on the fracture behavior of braided composite cylinders; experimental study

Mechanical Properties Degradation of Fiberglass Tubes during Biaxial Proportional Cyclic Loading

Failure behavior and crashworthiness characteristic of repaired composites‐metal hybrid tubes by acoustic emission

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