Numerical evaluation on the influence of void defects and interphase on the thermal expansion coefficients of three-dimensional woven carbon/carbon composites

Wei, Kunlong; Li, Jiang; Shi, Hang; Tang, Min

doi:10.1080/09276440.2019.1707586

Cited by 9 publications

(12 citation statements)

References 32 publications

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“…The volume fraction of the orthotropic sphere is equal to the total volume fraction of the pores and fibers. The three-dimensional parametric FVDAM is used to establish the micro-scale model according to the micromechanical formula of composites [15]. The stress-strain relationship of the equivalent model and the equivalent stiffness 1 C can be calculated as follows:…”

Section: First Step-equivalence Of Pores and Random Micro-fibersmentioning

confidence: 99%

“…With respective to pore distributed in matrix and fiber bundle, Mekonnen et al [14] developed a finite element model, which demonstrated that elastic modulus gradually decreased Page2 when more pore defects were considered. Wei et al [15] investigated the influence of pore defects on thermal expansion coefficient of composites, and employed a finite element method to calculate their thermal expansion coefficients. In addition, Yang et al [16] established a Voronoi-structure model and evaluated equivalent shear modulus of composites with different pore shapes by finite element software.…”

Section: Introductionmentioning

confidence: 99%

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A new two-step modeling strategy for random micro-fiber reinforced composites with consideration of primary pores

Cai

Shi

et al. 2022

Composites Science and Technology

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Section: First Step-equivalence Of Pores and Random Micro-fibersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new two-step modeling strategy for random micro-fiber reinforced composites with consideration of primary pores

Cai

Shi

et al. 2022

Composites Science and Technology

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“…The mismatch effect on the properties can also be estimated by adopting a micromechanics approach [ 21 , 22 ]. Many authors have used two-stage homogenization techniques to characterize the elastic and thermal behavior of composite materials in the presence of defects such as voids and debonding [ 23 , 24 ]. NFR composites’ mechanical properties are certainly influenced by non-cellulosic compounds such as hemicelluloses, lignin, waxes, pectin, etc.…”

Section: Introductionmentioning

confidence: 99%

Elastic Properties of Jute Fiber Reinforced Polymer Composites with Different Hierarchical Structures

et al. 2022

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A two-stage micromechanics technique is used to predict the elastic modulus, as well as the major and minor Poisson’s ratio of unidirectional natural fiber (NF) reinforced composites. The actual NF microstructure consists of cellulose, hemicellulose, lignin, lumen, etc., and these constituents and their contributions are neglected in classical models while quantifying their mechanical properties. The present paper addresses the effect of the real microstructure of the natural jute fiber (JF) by applying a micromechanics approach with the Finite Element Method. Six different hierarchically micro-structured JFs are considered to quantify the JF elastic properties in the first level of homogenization. Later, the JF reinforced polypropylene matrix properties are investigated in the second stage by adopting a homogenization approach. Taking into account the different hierarchical structures (HS), the fiber direction modulus (E1), transverse modulus (E2 and E3), in-plane and out-of-plane shear modulus (G12 and G23), and major (ν12, ν13) and minor (ν23, ν21) Poisson’s ratios are estimated for JF and JF reinforced polypropylene composites. The predicted elastic modulus from micromechanics models is validated against the analytical results and experimental predictions. From the present work, it is observed that the HS of NF needs to be considered while addressing the elastic properties of the NF-reinforced composite for their effective design, particularly at a higher volume fraction of NF.

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“…The thermal protection structure in aircraft usually consists of several layers, such as the fiber, matrix and interphase layer of composites. 11,12…”

mentioning

confidence: 99%

“…The thermal protection structure in aircraft usually consists of several layers, such as the fiber, matrix and interphase layer of composites. 11,12 Normally, fiber rods pierce spread tow woven fabrics in the direction of thickness to construct a spread tow woven pierced fabric to improve interlayer performance. [13][14][15] Theoretical computation and finite element analysis (FEA) methods for predicting the thermal conductive behavior of textile reinforced composites have always been the focus of researchers.…”

mentioning

confidence: 99%

Numerical study on thermal conductivities of spread tow woven pierced composites

Dou

et al. 2022

Textile Research Journal

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Textile reinforced composites are extensively used in thermal protection engineering because of their outstanding mechanical and physical properties. Spread tow woven pierced composites (STWPs) are composed of fiber rods, a spread tow and a matrix with small air pores. In the experiment, the STWPs displayed improved thermal conductivities compared with traditional woven composites. Thermal conductivities in the in-plane and out-of-plane directions have increments of 18.7% and 16.7%, respectively. This is mainly attributed to the influence of the fiber volume fraction. Herein, three numerical models were constructed to predict the thermal conductivities of the matrix, spread tow and fiber rods, and as the input parameter of the mesoscale model. The curvature of the interlaced tow in the mesoscale model was defined considering that the spread tow is extremely light and thin. The predicted results are in accordance with the experimental results, with only 8.13% and 8.94% errors in the in-plane and out-of-plane directions, respectively, indicating that the numerical models are accurate and effective. In addition, the thermal conductivities of STWPs decrease with the increase of porosity, but increase with the increment in fiber volume fraction and interphase thermal conductance. This work can provide effective guidance for the thermal design of STWPs.

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Numerical evaluation on the influence of void defects and interphase on the thermal expansion coefficients of three-dimensional woven carbon/carbon composites

Cited by 9 publications

References 32 publications

A new two-step modeling strategy for random micro-fiber reinforced composites with consideration of primary pores

A new two-step modeling strategy for random micro-fiber reinforced composites with consideration of primary pores

Elastic Properties of Jute Fiber Reinforced Polymer Composites with Different Hierarchical Structures

Numerical study on thermal conductivities of spread tow woven pierced composites

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