Influence of void defects on progressive tensile damage of three-dimensional braided composites

Dong, Jie; Gong, Yaohua

doi:10.1177/0021998317737829

Cited by 25 publications

(6 citation statements)

References 26 publications

(43 reference statements)

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“…21,22 Many scholars have explored the effect of defects on the mechanical properties of composites. 23,24 Dong et al 25 proposed a stiffness degradation method for generating random void defect cells, and simulated the tensile progressive damage of 3D woven composites using a mesoscopic finite element model containing random voids. The results showed that void defects in the matrix redistribute the stresses in the material, accelerate the damage extension of the material, and reduce the strength and plasticity of the material.…”

Section: Introductionmentioning

confidence: 99%

Tensile‐after‐ablation progressive damage and the failure mechanism of 2.5D woven composites with crack pores

Yang,

Dong,

Zhang

2023

Polymer Composites

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Abstract2.5D woven structures are of interest in new thermal protection systems for their excellent interlayer properties and structural stability. In this paper, dense (CDP) and lightweight (CLP) carbon/phenolic 2.5D woven composites were prepared. Quasi‐static tensile experiments were performed on the specimens before ablation (TCDP‐0, TCLP‐0) and after ablation for 30 s (TCDP‐30, TCLP‐30). A quarter macro–meso hybrid model that takes into account the degradation of material properties after ablation and ablative crack pores was innovatively proposed. The predicted tensile elastic modulus is within 9% error from the experimental results. The results show that TCDP‐30 and TCLP‐30 have rapid damage expansion and lethal injury at smaller displacements than the pre‐ablation specimens. The displacement of the maximum load point of TCDP‐30 is 38.7% lower than that of TCLP‐30. The forms of damage in TCDP‐30 are dominated by matrix fragmentation and matrix cracks. The damage forms of TCLP‐30 are dominated by debonding and delamination.Highlights Micro‐CT was used to collect matrix fabrication defects and ablative crack pores defect. A quarter macro–meso hybrid model that takes into account the degradation of material properties after ablation and ablative crack pore was innovatively proposed. The tensile failure mechanism of the material after ablation was revealed by the combination of experiment and numerical method.

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Section: Introductionmentioning

confidence: 99%

Tensile‐after‐ablation progressive damage and the failure mechanism of 2.5D woven composites with crack pores

Yang,

Dong,

Zhang

2023

Polymer Composites

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“…In order to understand the damage evolution behaviors of composites containing voids during the loading process, progressive damage analysis was employed from the theoretical simulation and the real experimental. [23][24][25][26][27] The acoustic emission (AE) technique as NDT method with high sensitivity and accuracy is often used to monitor the damage progression of composites. [28][29][30] Kosmann et al 31 applied AE measurement to detect the influence of voids on the failure behavior during compression tests.…”

Section: Introductionmentioning

confidence: 99%

Effects of various porosities on the damage evolution behavior of carbon fiber/epoxy composites using acoustic emission and micro-CT

Wang

Zhou

Wei

et al. 2022

Journal of Composite Materials

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Void defects can reduce the mechanical properties of composites and increase the potential danger of composite components in service. The effects of various porosities on damage evolution behaviors of carbon fiber/epoxy composites are deeply investigated by combining the damage visualization and acoustic emission response. The results showed that the increased porosity accelerates the damage evolution from micro-scale to macro-damage. Acoustic signals in composites are captured in advance when the porosity is high, and the voids below the kink band accelerate matrix cracking and delamination, while specimens with low porosity easily cause fiber damage and fiber/matrix debonding. Additionally, applying extra pressure during the resin transfer molding process can decrease the porosity, but excessive extra pressure may result in an inverse result. The method combining acoustic emission and micro-CT can provide a reference for improving quality and the health monitoring of composites.

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“…At present, researchers have used different methods to characterize the mechanical properties of 3D braided composites, for example, analytical methods, 2,3 multiscale modeling, 4 and parameterized modeling. 5 Wu 6 established a three-cell model based on the microstructures of each region of the braided composites, and the proposed interior unit cell accounts for the largest volume fraction and contains eight yarns.…”

Section: Introductionmentioning

confidence: 99%

A parameterized unit cell model for 3D braided composites considering transverse braiding angle variation

Zhang

Yan

et al. 2021

Journal of Composite Materials

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In this paper, a parameterized unit cell model for 3D braided composites considering transverse braiding angle variation is proposed, to assist the mechanical characterization of such materials. According to the geometric characteristics of 3D braided composites, a method for automatically generating textile geometries based on practical braiding parameters, including the main braiding angle, the transverse braiding angle, and the fiber volume fraction, is established and implemented in a CAD software package. In this model, the addition of transverse braiding angle educes a more flexible control of fiber volume fraction distribution, and with the combination of control parameters according to the actual fiber distribution needs of users, it can suggest the appropriate parameters for the unit cell. The generated unit cell models are used in finite element analysis and the results are validated against experiments for a number of 3D braided composites in terms of fiber volume fraction and elastic constants, and good agreement is observed. Based on the parameterized unit cell model, the effects of main braiding parameters on the elastic properties of 3D braided composites are discussed.

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Influence of void defects on progressive tensile damage of three-dimensional braided composites

Cited by 25 publications

References 26 publications

Tensile‐after‐ablation progressive damage and the failure mechanism of 2.5D woven composites with crack pores

Tensile‐after‐ablation progressive damage and the failure mechanism of 2.5D woven composites with crack pores

Effects of various porosities on the damage evolution behavior of carbon fiber/epoxy composites using acoustic emission and micro-CT

A parameterized unit cell model for 3D braided composites considering transverse braiding angle variation

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