Damage mechanisms of 3-D rectangular braided composite under multiple impact compressions

Gao, Xingzhong; Sun, Yunlan; Gu, Bohong

doi:10.1016/j.ast.2018.08.031

Cited by 27 publications

(14 citation statements)

References 29 publications

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“…This is because the 3D braided composite mainly suffers shear failure under compression. 36 , 37 It also shows that the shear band zone is the crucial load-bearing zone of the composite under shear stress.…”

Section: Resultsmentioning

confidence: 92%

Failure behaviors of 3D braided composites with defects in different locations under low-velocity impact compression

Guo

Sun

et al. 2021

Textile Research Journal

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This paper aims to investigate the effects of the impurity defects in different locations on the transverse compressive behaviors of three-dimensional (3D) braided carbon fiber/epoxy composites under low-velocity impact. The composites with defects in different locations were prepared by placing polytetrafluoroethylene particles at the bottom surface, corner and center parts, respectively. The compression test was implemented with the drop-weight impact method. The failure morphologies were characterized using high-speed photography and micro computed tomography (Micro-CT). A mesoscale finite element model considering the defect was developed to enhance the physical understanding of the compression process. It is found that defects located at the corner zone and the central zone have a greater impact on the compression behavior of the 3D braided composite than the defect located at the bottom surface part. The defects at the corner and center zones reduce the compressive strength of the composite, increase the failure area, and cause severe damage to both the yarn and resin. In addition, the defect causes local stress concentration on the surrounding yarns. The defects in different locations cannot change the main shear failure mode of the 3D braided composite. It is shown that great attention should be given during the manufacturing or detection process to avoid such a deterioration effect of defects located in those zones on composite strength.

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Section: Resultsmentioning

confidence: 92%

Failure behaviors of 3D braided composites with defects in different locations under low-velocity impact compression

Guo

Sun

et al. 2021

Textile Research Journal

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“…This formed multiple impact compressions is shown in Figure 5. 38 In order to investigate the failure mechanisms of composites during the multiple impact compression, an i-speed 716 high-speed camera (IX Cameras Ltd, United Kingdom) was used to capture the impact compression information (Figure 6). The frequency of high-speed camera was 100,000 frames per second.…”

Section: Methodsmentioning

confidence: 99%

Effect of braiding angle on dynamic mechanical properties of 3-D braided rectangular composites under multiple impact compressions

Gao

Siddique

2018

Journal of Composite Materials

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This paper reports dynamic mechanical behaviors of 3-D rectangular braided composite with different braiding angles under multi-pulse impact load. The composite materials were prepared with braided preforms which have braiding angles of 15 °, 26° and 37 °, respectively. Impact compression tests were conducted in split Hopkinson pressure bar. High-speed camera system was used to capture damage growth process and a meso-scale finite element model was established to investigate failure mechanisms. We found that the braiding angle has significant effects on damage development, failure mechanisms and ultimate damage morphogenesis. The braided composite with 15° braiding angle shows a linear elastic response at the initial stage of stress–strain curves until the peak load. After the peak load, the composite has brittle failure behaviors, while the composites with 26° and 37° braiding angles exhibit non-linear elastic response at the beginning stage of stress–strain curves and ductile failure mode after yielding points. The composites with different braiding angles demonstrated both distinguished damage development and final fracture morphology. In addition, load-bearing ratio of yarns in composite was also affected by braiding angles.

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“…It should be noted that the matrix model is geometrically complicated, because it must fill the space between the curved fibers; hence, it is also necessary to use elements of the tetragonal type. The matrix and fibers were fully modeled by the authors in [23]. The matrix was treated as elastic plastic material.…”

Section: Numerical Studiesmentioning

confidence: 99%

“…The buckling phenomenon can be eliminated by additional reinforcement towards the z axis-an axis perpendicular to the layer system. However, this requires the use of special fabrics (3D braided) and the use of the VARTM (vacuum assisted resin transfer molding) method [18][19][20][21][22][23][24][25][26][27]. In addition, the effects of the strain rate, aging, and temperature are also considered.…”

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confidence: 99%

Material Characterization of PMC/TBC Composite Under High Strain Rates and Elevated Temperatures

2020

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Polymer matrix composites (PMC), despite their many advantages, have limited use at elevated temperatures. To expand the scope of their uses, it becomes necessary to use thermal barrier coatings (TBC). In addition to elevated temperatures, composite structures, and thus TBC barriers, can be exposed to damage from impacts of foreign objects. Therefore, before using the thermal barrier in practice, knowledge about its behavior under high-speed loads is necessary. The paper presents results for samples with the PMC/TBC system subjected to dynamic compression using a split Hopkinson pressure bar (SHPB). The substrate was made of CFRP (carbon reinforced polymer) with epoxy matrix and twill fabric. TBC was made of ceramic mat saturated by commercial hardener from Vitcas company. The tests were carried out at ambient temperature and elevated temperature—55 °C and 90 °C. Tests at ambient temperature were carried out for three pressure levels: 1, 1.5, and 2 bar. Only the pressure of 1 bar was used for the elevated temperature. Studies have shown that the limit load is 1 bar for ambient temperature. At 1.5 bar, cracks occurred in the TBC structure. Increased temperature also adversely affects the TBC barrier strength and it is damaged at a pressure of 1 bar.

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Damage mechanisms of 3-D rectangular braided composite under multiple impact compressions

Cited by 27 publications

References 29 publications

Failure behaviors of 3D braided composites with defects in different locations under low-velocity impact compression

Failure behaviors of 3D braided composites with defects in different locations under low-velocity impact compression

Effect of braiding angle on dynamic mechanical properties of 3-D braided rectangular composites under multiple impact compressions

Material Characterization of PMC/TBC Composite Under High Strain Rates and Elevated Temperatures

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