Effect of Nesting of Fiber Bundles on Micro Fracture of Laminated Woven Fabric Composite

2002 ◽  
Author(s):  
Toshiko Osada ◽  
Asami Nakai ◽  
Hiroyuki Hamada
Keyword(s):  
Volume Fraction ◽  
Woven Fabric ◽  
Fiber Bundles ◽  
Fiber Volume ◽  
Woven Fabric Composites ◽  
Number Of Layers ◽  
Fabric Composite ◽  
Knee Point ◽  
Fabric Composites ◽  
Layer Increase

In laminated woven fabric composites, fiber bundles do not pack tightly because there are resin rich regions caused by crimp of fiber bundles. The fiber bundles in one layer are often fitted into the neighboring layer, which is called nesting. In this study, the effect of nesting by laminating on mechanical properties and micro fracture behavior of composites was investigated. Tensile testing of woven fabric composites with different number of layers and observation using optical microscopy were performed. With the increase of number of layers, nesting is more likely to occur, resulting in a decrease in thickness per layer increase in fiber volume fraction. This also lead to an increase in modulus and strength but a decrease in knee point stress. The locations at which cracks occurred were different in specimens with and without nesting.

Thermo-Mechanical Modeling of 3D Woven Fabric Composites Using Two-Step Homogenization Approach

2019 ◽  
Author(s):  
Nagappa Siddgonde ◽  
Anup Ghosh
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Woven Fabric ◽  
Fiber Volume ◽  
Woven Fabric Composites ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Matrix Properties ◽  
Homogenization Approach ◽  
3D Fea

Abstract A 3D finite element based Representative Volume Element (RVE) model has been developed to predict the thermo-mechanical properties of 3D orthogonal interlock woven fabric composites (OIWFC) and angle interlock woven fabric composite (AIWFC) using a two-step homogenization approach. The first step homogenization, micro-homogenization, deals with resin infiltration effect of yarn as a unidirectional continuous fiber with an assumption of 80 percent of fiber volume fraction based on initial fiber and matrix properties. The second step, meso-homogenization, predicts effective thermo-mechanical properties of 3D woven fabric composites based on effective yarn and matrix properties. The RVE analysis has been performed using 3D FEA method with periodic boundary conditions (PBCs). Further, a void study has been performed considering the influences of void on thermo-mechanical properties of the 3D woven fabric composite. It is noted that the influence of void contents plays a significant role in predicting the thermo-mechanical properties of the 3D WFC. The thermo-mechanical properties gradually decrease with an increase of void contents. Studies have been carried out considering the same fiber volume fractions in both 3D WFC models. An AIWFC model predicts higher values of thermo-mechanical constants than OIWFC model.

Measurement and Prediction of Effective Thermal Conductivity for Woven Fabric Composites

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1808-1813 ◽  
Author(s):  
Nam Seo Goo ◽  
Kyeongsik Woo
Keyword(s):  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Woven Fabric ◽  
Fiber Volume ◽  
Plain Weave ◽  
Woven Fabric Composites ◽  
Weave Fabric ◽  
Experimental Apparatus ◽  
Fabric Composites ◽  
Thermal Conductivities

The current paper deals with the measurement and prediction of thermal conductivities for plain weave fabric composites. An experimental apparatus was setup to measure the temperature gradients from which the thermal conductivities were obtained. The thermal conductivities were also calculated using finite element analyses for plain weave unit cell models and then compared with experimental results. In addition, the effect of a phase shift and the fiber volume fraction in the tow on the thermal conductivities was addressed.

Effect of warp and fill-fiber volume fractions on mechanical properties of glass/epoxy woven fabric composites

2020 ◽  
Vol 54 (24) ◽  
pp. 3501-3513
Author(s):  
Mohammad Aghaei ◽  
Mahmood M Shokrieh ◽  
Reza Mosalmani
Keyword(s):  
Mechanical Properties ◽  
Micromechanical Model ◽  
Woven Fabrics ◽  
Woven Fabric ◽  
Experimental Program ◽  
Fiber Volume ◽  
Volume Fractions ◽  
Woven Fabric Composites ◽  
New Concepts ◽  
Fabric Composites

Mechanical properties of woven fabric composites are influenced by fabric geometry and harness. In the present research, woven fabric composites made of ML-506 epoxy resin and E-glass woven fabrics with three different fabric geometries (harnesses of 2, 5, and 8) were studied experimentally. The new concepts of warp and fill-fiber volume fractions were introduced. Based on these new concepts, a micromechanical model for predicting the stiffness and strength of composites made of woven fabrics was developed. An experimental program was conducted to evaluate the present model and the new concepts of warp and fill-fiber volume fractions. The results obtained by the new micromechanical model have been compared with the conducted experimental results as well as the experimental data available in the literature, and very good correlations were obtained.

A parametric investigation into the flexural properties of singly curved composites reinforced with 3D-integrated woven fabrics

2018 ◽  
Vol 49 (10) ◽  
pp. 1411-1439
Author(s):  
Tohid Dastan ◽  
Sayyed MAHDI Hejazi ◽  
Mohammad Sheikhzadeh
Keyword(s):  
Total Energy ◽  
Energy Absorption ◽  
Peak Load ◽  
Woven Fabric ◽  
Composite Sample ◽  
Flexural Properties ◽  
Woven Fabric Composites ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Foam Filling

In this study, the effect of curvature on the flexural behavior of 3D integrated woven fabric composites was initially investigated. After optimizing the effect of curvature, two strengthening methods (thickening upper skin and foam-filling) were applied on curved 3D integrated woven fabric composites separately and simultaneously. Normalized-weight flexural properties were used as an efficiency index to analyze and compare the efficiency of both methods. Results showed that as curvature increases from 0 to 0.007 and 0.014 cm−1, peak load increases about 29.8 and 36.7%, respectively. In addition, as upper skin thickness increases, most of flexural properties increase and then decrease. Moreover, flexural properties improved by injecting polyurethane foam into the empty core. Furthermore, applying both methods on curved 3D integrated woven fabric composite sample made an outstanding improvement in flexural properties. That is, the flexural peak load, stiffness, and total energy absorption increased 244.4, 142.7, and 496.4%, respectively, in comparison to the unreinforced 3D integrated woven fabric composite sample. Based on the normalized results, it could be concluded that applying thickening upper skin and foam-filling the core methods separately have no considerable improvement in specific flexural properties; however, applying both methods simultaneously improved specific peak load and specific total energy absorption 35.3 and 134.1%, respectively.

Response surface analysis of biaxial mechanical properties and elastic parameters for woven fabric composites

2018 ◽  
Vol 49 (2) ◽  
pp. 219-242 ◽  
Author(s):  
JW Chen ◽  
B Zhao ◽  
WJ Chen ◽  
MY Wang ◽  
XY Guan ◽  
...  
Keyword(s):  
Response Surface ◽  
Woven Fabrics ◽  
Woven Fabric ◽  
Elastic Parameters ◽  
Complex Deformation ◽  
Woven Fabric Composites ◽  
Fabric Composite ◽  
Deformation Properties ◽  
Fabric Composites ◽  
Stress Levels

This paper describes a self-developed MATLAB program for achieving complex deformation properties and accurate elastic parameters of woven fabrics. Using this program, the response surface analyses of deformation and elastic parameters were conducted to reveal the variation and evolution in stiffness, Poisson’s ratio, and orthotropy of the laminated woven fabric composite under different loading/unloading stages, cycles, stress levels and ratios, which is a further development of our prior work. Results show that elastic parameters and orthotropic characteristics of the material vary noticeably with the loading/unloading stages, cycles, stress levels, and ratios. As higher values are required to model the remarkable warp–weft interaction and large negative strains, Poisson’s ratios in boundary regions with a maximum of 1.0 (loading) or 1.5 (unloading) are outside the bounds normally expected for these parameters. In addition, the proposed method is feasible to evaluate elastic parameters for any stress state, and thereby provides new insights into underlying deformation mechanisms of woven fabric composites.

scholarly journals A New Evaluation Method of Interface between Fiber Bundles in Woven Fabric Composites

1998 ◽  
Vol 7 (2) ◽  
pp. 096369359800700 ◽  
Author(s):  
H. Hamada ◽  
A. Nakai ◽  
K. Hana ◽  
T. Harada
Keyword(s):  
Shear Strength ◽  
Evaluation Method ◽  
Woven Fabric ◽  
Fiber Bundles ◽  
Coupling Agents ◽  
Silane Coupling Agents ◽  
Pull Out ◽  
Woven Fabric Composites ◽  
Fabric Composites ◽  
Silane Coupling

Evaluation method of interface between fiber bundles in woven fabric composites called “Fiber bundle pull-out test” was proposed. Apparent shear deformation could be applied to the fiber crossing part and the strength could be obtained. The effects of concentration of silane coupling agents on shear strength of fiber crossing part were clarified.

Experimental investigation of the tensile and bending behavior of multi-axial warp-knitted fabric composites

2016 ◽  
Vol 88 (3) ◽  
pp. 333-344 ◽  
Author(s):  
Xiaoping Gao ◽  
Danxi Li ◽  
Wei Wu ◽  
Si Chen
Keyword(s):  
Volume Fraction ◽  
Orientation Distribution ◽  
Knitted Fabric ◽  
Fiber Volume ◽  
Molding Method ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Static Tensile ◽  
Bending Behavior ◽  
Warp Knitted Fabric

An experimental study was carried out on the tensile and bending behavior of multi-axial warp-knitted fabric composites. Five specimens reinforced with multi-axial warp-knitted fabric/epoxy were manufactured by a vacuum-assisted resin transfer molding method. Quasi-static tensile and three-point bending tests were carried out in a number of orientations relative to the stitching direction: quadriaxial, triaxial, biaxial (±45° and 0/90°) and unidirectional. The results of the tests revealed that the quadriaxial and biaxial (±45°) samples showed quasi-isotropic behavior, whereas the other laminates showed anisotropic behavior. The influence of fiber volume fraction and the orientation distribution of the constituent material on the tensile and bending behavior were also analyzed. The relationships between the stress and strain and the tensile and bending behavior of different multi-axial warp-knitted fabric composite were obtained by polynomial fitting.

Effective Transverse Electrical Permittivities of Plain Weave, Twill Weave and Satin Fabric Composites

1995 ◽  
Vol 411 ◽  
Author(s):  
T.-W. Chou ◽  
Q-G. Ning
Keyword(s):  
Volume Fraction ◽  
Effective Properties ◽  
Dielectric Behavior ◽  
Analytical Prediction ◽  
Fiber Volume ◽  
Plain Weave ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Electrical Permittivity ◽  
Twill Weave

ABSTRACTThis paper reports the analytical prediction of effective transverse electrical permittivities of plain weave, twill weave, 4-harness irregular satin, as well as 5-harness and 8-harness satin fabric composites with lossy constituents. Analytical solutions of the effective properties are presented. Numerical examples are given to illustrate the effects of fiber volume fraction and fabric architecture on the composite effective transverse dielectric behavior. Key words: electrical permittivity, plain weave, twill weave, satin weave, fabric composite, analytical solution.

Ceramic Fiber - Fluoropolymer Composites for Electronic Packaging Materials

1989 ◽  
Vol 155 ◽  
Author(s):  
John D. Bolt
Keyword(s):  
Fiber Composites ◽  
Short Fiber ◽  
Dielectric Constants ◽  
Woven Fabric ◽  
Ceramic Fiber ◽  
Fiber Volume ◽  
Woven Fabric Composites ◽  
Fabric Composites ◽  
Out Of Plane ◽  
Thermal Conductivities

ABSTRACTAluminum nitride (AIN), alumina and aramid fibers have been incorporated into epoxy and fluoropolymer matrices. The fluoropolymer composites have dielectric constants less than 3.4 and losses below 0.3%, measured out-of-plane. In-plane and out-of-plane thermal conductivities of the AIN-fluoropolymer composites averaged 5.2 and 1.3 W/mK, respectively, at fiber volume fractions of 0.26 to 0.29. In-plane thermal conductivities of woven fabric composites were accurately predicted by mixing rules; for non-woven and short fiber composites, thermal conductivities were less than predicted. These composites had higher out-of-plane thermal conductivities due to out-of-plane components of the fiber orientations.

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