预测挤压木材聚合物复合材料的取向

IF 4.1 2区 工程技术 Q1 MECHANICS
Sajjad Pashazadeh, Arvindh Seshadri Suresh, Viney Ghai, Tobias Moberg, Anders Brolin, Roland Kádár
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引用次数: 0

摘要

本研究阐述了结合材料函数和数值建模预测高填充木质聚合物复合材料(WPC)在单螺杆挤压中的取向及其验证的一般程序。毛细管流变仪用于确定生物复合材料的剪切粘度和壁滑函数以及熔体密度。数值模型包括一个模型膜模,在该膜模中使用广义牛顿构成方程框架中的有限元法模拟熔体流动。纤维取向采用 Folgar-Tucker 方法建模,并包括过程中纤维与纤维之间的相互作用。在单螺杆挤压机上对生物复合材料进行了参考挤压试验。挤出装置包括两个熔体压力传感器,用于确定模头入口初始条件(挤出机末端/模头入口),并对壁滑边界条件(沿模头排出的压力)提供反馈。总体而言,在 20 wt. % WPC 的所有螺杆速度下,实验与模拟的压力误差均小于 6.5%。生产挤出物时,根据扫描电子显微镜显微照片和图像分析估算木纤维的取向,并与模拟的纤维取向进行比较。结果表明,所概述的一般程序可用于校准,以预测单螺杆挤压过程中木质纤维生物复合材料的总体取向分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Predicting orientation in extruded wood polymer composites
A general procedure for combining material functions and numerical modeling to predict the orientation of highly filled wood polymer composites (WPCs) in a single screw extrusion and validation thereof is elaborated in this study. Capillary rheometry was used to determine the shear viscosity and wall slip functions as well as the melt density of the biocomposites. The numerical model consisted of a model film die where the melt flow was simulated using a finite element method in the generalized Newtonian constitute equation framework. Fiber orientation was modeled using the Folgar–Tucker approach and included fiber–fiber interaction during the process. Reference extrusion tests were performed on a single screw extruder on the biocomposites. The extrusion setup included two melt pressure transducers that were used to determine the die inlet initial conditions (end of the extruder/die inlet) and provide feedback on the wall slip boundary conditions (pressure discharge along the die). Overall, the pressure error between experiments and simulations was less than 6.5% for all screw speeds investigated in 20 wt. % WPCs. Extrudates were produced, and the wood fiber orientation was estimated based on scanning electron microscopy micrographs and image analysis and compared with the simulations of fiber orientation. We show that the general procedure outlined can be calibrated to predict the overall orientation distribution of wood fiber biocomposites during single screw extrusion.
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来源期刊
Physics of Fluids
Physics of Fluids 物理-力学
CiteScore
6.50
自引率
41.30%
发文量
2063
审稿时长
2.6 months
期刊介绍: Physics of Fluids (PoF) is a preeminent journal devoted to publishing original theoretical, computational, and experimental contributions to the understanding of the dynamics of gases, liquids, and complex or multiphase fluids. Topics published in PoF are diverse and reflect the most important subjects in fluid dynamics, including, but not limited to: -Acoustics -Aerospace and aeronautical flow -Astrophysical flow -Biofluid mechanics -Cavitation and cavitating flows -Combustion flows -Complex fluids -Compressible flow -Computational fluid dynamics -Contact lines -Continuum mechanics -Convection -Cryogenic flow -Droplets -Electrical and magnetic effects in fluid flow -Foam, bubble, and film mechanics -Flow control -Flow instability and transition -Flow orientation and anisotropy -Flows with other transport phenomena -Flows with complex boundary conditions -Flow visualization -Fluid mechanics -Fluid physical properties -Fluid–structure interactions -Free surface flows -Geophysical flow -Interfacial flow -Knudsen flow -Laminar flow -Liquid crystals -Mathematics of fluids -Micro- and nanofluid mechanics -Mixing -Molecular theory -Nanofluidics -Particulate, multiphase, and granular flow -Processing flows -Relativistic fluid mechanics -Rotating flows -Shock wave phenomena -Soft matter -Stratified flows -Supercritical fluids -Superfluidity -Thermodynamics of flow systems -Transonic flow -Turbulent flow -Viscous and non-Newtonian flow -Viscoelasticity -Vortex dynamics -Waves
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