M.Y. Matveev

Bio: M.Y. Matveev is an academic researcher from University of Nottingham. The author has contributed to research in topics: Composite number & Composite material. The author has an hindex of 8, co-authored 16 publications receiving 391 citations.

Geometrical modelling of 3D woven reinforcements for polymer composites: Prediction of fabric permeability and composite mechanical properties

Abstract: For a 3D orthogonal carbon fibre weave, geometrical parameters characterising the unit cell were quantified using micro-Computed Tomography and image analysis. Novel procedures for generation of unit cell models, reflecting systematic local variations in yarn paths and yarn cross-sections, and discretisation into voxels for numerical analysis were implemented in TexGen. Resin flow during reinforcement impregnation was simulated using Computational Fluid Dynamics to predict the in-plane permeability. With increasing degree of local refinement of the geometrical models, agreement of the predicted permeabilities with experimental data improved significantly. A significant effect of the binder configuration at the fabric surfaces on the permeability was observed. In-plane tensile properties of composites predicted using mechanical finite element analysis showed good quantitative agreement with experimental results. Accurate modelling of the fabric surface layers predicted a reduction of the composite strength, particularly in the direction of yarns with crimp caused by compression at binder cross-over points.

Understanding the buckling behaviour of steered tows in Automated Dry Fibre Placement (ADFP)

Abstract: Technologies for automated fibre lay-up have proven their usefulness in composites manufacturing. Further development of the technologies, such as Automated Dry Fibre Placement (ADFP), allow further reduction of waste and increase of the design space through tow steering which enables creation of composites with tailored properties. Tow steering is, however, limited by possible defects such as wrinkles which result from mismatch of fibre length and steering path. This paper addresses wrinkle formation at different steering radii and provides a closed-form solution for the problem. Experimental results are used for estimation of the model parameters and validation of the model. An analytical framework is used to explore effects of processing parameters on defect formation. It was found that the tack stiffness has the greatest influence on defect formation. Parametric studies showed that increase of the temperature within the admissible temperature window can improve the tack properties and hence improve the lay-up.

Effect of yarn cross-sectional shape on resin flow through inter-yarn gaps in textile reinforcements

Abstract: Axial flow through gaps between aligned straight yarns with realistic cross-sectional shapes, described by power-ellipses, was analysed numerically. At a given fibre volume fraction, equivalent gap permeabilities have a maximum at minimum size of elongated tapering parts of the gap cross-section and a ratio of gap width to height near 1. When the yarn spacing is given in addition to the fibre volume fraction, calculated maximum and minimum values for the equivalent permeability of inter-yarn gaps, which occur at near-rectangular and lenticular cross-sections, differ by factors of up to 3.3. Novel approximations for the shape factor and the hydraulic diameter in Poiseuille flow were derived as a function of the fibre volume fraction, the yarn cross-sectional aspect ratio and the exponent describing the shape of the power-elliptical yarn cross-section. This allows the equivalent gap permeability to be predicted with good accuracy for any fibre volume fraction and yarn cross-section.

Process Modeling in Composites Manufacturing

Abstract: Introduction Motivation and Contents Preliminaries Polymer Matrices for Composites Fibers Classification General Approach to Modeling Organization of the Book Overview of Manufacturing Processes Background Classification Based on Dominant Flow Process Short Fiber Suspension Manufacturing Methods Advanced Thermoplastic Manufacturing Methods Advanced Thermoset Composite Manufacturing Methods Transport Equations for Composite Processing Introduction to Process Models Conservation of Mass (Continuity Equation) Conservation of Momentum (Equation of Motion) Stress-Strain Rate Relationship Examples to Solve Viscous Flow Problems Conservation of Energy Constitutive Laws and Their Characterization Resin Viscosity Viscosity of Aligned Fiber Thermoplastic Laminates Suspension Viscosity Reaction Kinetics Thermoplastic Reactive Processing Crystallization Kinetics Permeability Fiber Stress Model Simplifications and Solution Formulation of Models Model and Geometry Simplifications Dimensionless Analysis and Dimensionless Numbers Customary Assumptions in Polymer Composite Processing Boundary Conditions for Flow Analysis Convection of Variables Process Models from Simplified Geometries Mathematical Tools for Simplification Solution Methods Numerical Methods Validation Short Fiber Composites Compression Molding Extrusion Injection Molding Exercises Advanced Thermoplastic Manufacturing Processes Composite Sheet Forming Processes Pultrusion Thermal Model Online Consolidation of Thermoplastics Processing Advanced Thermoset Fiber Composites Autoclave Molding Liquid Composite Molding Filament Winding of Thermosetting Matrix Composites Summary and Outlook MATLAB Files Solution to Example 8.13 using FDM Additional Examples with LIMS to Model Liquid Mold Filling Bibliography Index

Evaluation of the mechanical behavior of epoxy composite reinforced with Kevlar plain fabric and glass/Kevlar hybrid fabric

Abstract: In this study, composite plates were manufactured by hand lay-up process with epoxy matrix (DGEBA) reinforced with Kevlar fiber plain fabric and Kevlar/glass hybrid fabric, using to an innovative architecture. Results of the mechanical properties of composites were obtained by tensile, bending and impact tests. These tests were performed in the parallel direction or fill directions of the warp and in a 90° direction. FTIR was used in order to verify the minimum curing time of the resin to perform the mechanical tests, and scanning electron microscopy was used to observe reinforcement and matrix fractures. Composites with Kevlar/glass hybrid structure in the reinforcing fabric showed the better results with respect to specific mechanical strength, as well as bending and impact energy.