Numerical prediction of the stiffness and strength of medium density fiberboards

Šliseris, Jānis; Andrä, Heiko; Kabel, Matthias; Dix, B.; Plinke, Burkhard; Wirjadi, Oliver; Frolovs, Ģirts

doi:10.1016/j.mechmat.2014.08.005

Cited by 34 publications

(22 citation statements)

References 35 publications

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“…Studies on wood fiber reinforced composites have mainly focused on low-density fiberboard (LDF) (< 600 kg/m 3 ) (Chen et al 2015a,b;Cai et al 2016) and medium-density fiberboard (MDF) (600 kg/m 3 to 800 kg/m 3 ) (Sliseris et al 2014;Taghiyari et al 2015a,b;Liang et al 2016;Taghiyari et al 2016). The LDF is often referred to as insulation board because it is mainly used for thermal insulation in civil engineering.…”

Section: Introductionmentioning

confidence: 99%

Investigation into Mechanical, Thermal, Flame-Retardant Properties of Wood Fiber Reinforced Ultra-High-Density Fiberboards

2017

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The demand has grown in many fields for materials that are eco-friendly and sustainably developed. In this study, several formulations of novel wood fiber reinforced ultra-high-density fiberboards (UHDFs) using resoltype phenolic resin (RTPR) as binders were manufactured for application in decorative building facades. The influences of the various formulations on water resistance and the mechanical, thermal, and fire-resistant properties were systematically examined. All formulations of the UHDFs exhibited better water resistance, internal bonding, and fire resistance as the RTPR content and density increased. To better evaluate mechanical properties, the microstructure of the UHDFs was observed using scanning electron microscopy. After optimization of hot-pressing conditions, UHDFs with excellent mechanical properties of approximately 7.2 GPa, 85.9 MPa, and 5.4 MPa for bending modulus, bending strength, and internal bonding, respectively, were achieved. Good water and flame resistance were also achieved, which makes these materials competitive with other commercial products. District, Beijing, PR China, 100091; b: College of Furniture and Industrial Design, Nanjing Forestry University, No. 159 LongPan Road, Nanjing, Jiangsu, P.R. China, 210037; * Corresponding author: Guowj717@sina.com Keywords INTRODUCTIONCurrently, reducing carbon and promoting sustainable development are among the most pressing issues in high-energy-dissipation building projects, which are now making great efforts to develop green building materials. Ceramic tiles are an important material for use in decorative building facades. However, their production process creates a lot of dust and consumes a lot of electrical energy. Therefore, the authors proposed a novel, natural, fiber-reinforced biomass composite as an alternative to ceramic tiles for use in decorative facades, contributing to the sustainable development of green buildings.Wood fibers, an environmentally friendly, natural fiber, have been widely used in indoor furniture (Saz-Orozco et al. 2014;Sommerhuber et al. 2016;Wang et al. 2016) and automobile interiors (Ann Gnpta et al. 2008;Gallo et al. 2013), but are not often used as structural materials in engineering due to their poor mechanical properties.Conventionally, wood fiber reinforced composites are composed of wood fibers that have been pressed together under high temperature and pressure with a resin binder to form a homogeneous board. Studies on wood fiber reinforced composites have mainly focused on low-density fiberboard (LDF) (< 600 kg/m 3 ) (Chen et al. 2015a,b;Cai et al. 2016) and medium-density fiberboard (MDF) (600 kg/m 3 to 800 kg/m 3 ) (Sliseris et al. (2015) and Arévalo and Peijs (2016) prepared MDF using methylene diphenyl diisocyanate and the self-binding capability of cellulose, respectively. However, these improvements are very limited and cannot be used in decorative facades due to its low mechanical properties according to JG/T 260 (2009). To promote the application of wood fiber reinforced composite...

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Section: Introductionmentioning

confidence: 99%

Investigation into Mechanical, Thermal, Flame-Retardant Properties of Wood Fiber Reinforced Ultra-High-Density Fiberboards

2017

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“…Usage of the spectral method approach based on the fast Fourier transform was pioneered by Moulinec and Suquet 24 and has gained significant attention in computational material mechanics. 25,26 Besides the computational performanceespecially when simulating periodic microstructures-one significant advantage of the spectral method is the straightforward use of experimental datasets consisting of regularly arranged measurement points. One drawback of the early spectral method variants, namely the poor convergence rate for materials with a high difference in stiffness or strength, has been overcome by the use of sophisticated root-finding algorithms instead of the original fix-point scheme.…”

Section: Numerical Solvermentioning

confidence: 99%

Coupled Crystal Plasticity–Phase Field Fracture Simulation Study on Damage Evolution Around a Void: Pore Shape Versus Crystallographic Orientation

Diehl

Wicke

Shanthraj

et al. 2017

JOM

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Various mechanisms such as anisotropic plastic flow, damage nucleation, and crack propagation govern the overall mechanical response of structural materials. Understanding how these mechanisms interact, i.e. if they amplify mutually or compete with each other, is an essential prerequisite for the design of improved alloys. This study shows-by using the free and open source software DAMASK (the Dü sseldorf Advanced Material Simulation Kit)-how the coupling of crystal plasticity and phase field fracture methods can increase the understanding of the complex interplay between crystallographic orientation and the geometry of a void. To this end, crack initiation and propagation around an experimentally obtained pore with complex shape is investigated and compared to the situation of a simplified spherical void. Three different crystallographic orientations of the aluminum matrix hosting the defects are considered. It is shown that crack initiation and propagation depend in a non-trivial way on crystallographic orientation and its associated plastic behavior as well as on the shape of the pore.

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“…The continuum damage approach was used to predict the strength (Souza et al 2011). Three damage variables and three maximal stress criteria were used (Sliseris et al 2014;Qing and Mishnaevsky 2010). The damage variables d i were computed by using exponential expression:…”

Section: Solution Of Elasticity Problemmentioning

confidence: 99%

“…MDF is formed from defibrated wood fibers and glue, providing several advantages such as less material properties deviation, no knots, shape and size variety, less moisture and temperature caused expansion compared to wood. The virtual design of MDF microstructures can successfully be used to tailor material mechanical properties (strength, stiffness), moisture and temperature properties for specific needs (Sliseris et al 2014). The contribution of this publication is the numerical method for strength and stiffness analysis of the MDF microstructure.…”

Section: Introductionmentioning

confidence: 99%

“…The thickness of the S2 layer is about 85 % of the total cell wall thickness and the microfibril angle (with respect to the fiber axis) in the S2 layer varies from 10°to 30° (Persson 2000). To approximate the microfibril angle in the S2 layer the log-normal probability distribution is suitable (Persson 2000;Sliseris et al 2014). MDF is produced mainly with urea-formaldehyde resins (partly modified with melamine) and to a small part with PMDI (polymeric diisocyanate) (Osemeahon and Barminas 2007).…”

Section: Introductionmentioning

confidence: 99%

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Virtual characterization of MDF fiber network

et al. 2016

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A virtual design method for medium density fiberboards (MDF) is proposed with the aim to optimize the fiber orientation and lay-up of MDF. The new method estimates the stiffness and strength by using microstructure models of the MDF fiber network. The virtual design is used to improve the manufacturing technology of MDF plates with multilayer oriented fiber structure. Experimental investigations of the mechanical behavior of MDF microstructure for various fiber geometries, glue content and distribution are complicated, time consuming and expensive. On the other side, virtual microstructure design allows to develop a new wood fiber based material with less experimental work. Microstructure models help to better understand the non-linear damage mechanical behavior of a wood fiber network depending on fiber geometrical parameters. Such parameters as crack distribution and fiber deformation on micro-scale level are complicated to experimentally measure, but possible to model using computer simulations. The virtual design tool requires less empirical data. The model takes into account information on average wood fiber orientation, fiber diameter, fiber length and mechanical properties of wood fiber cell wall and glue. The numerical method for strength and stiffness analysis of MDF microstructure was calibrated using standard MDF with non-oriented fibers. It turned out that this method gives precise results for MDF with oriented fibers and even with multilayer structure. The proposed virtual microstructure design tool can significantly improve and speed-up the optimization manufacturing technology of MDF and other wood fiber based composites

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Numerical prediction of the stiffness and strength of medium density fiberboards

Cited by 34 publications

References 35 publications

Investigation into Mechanical, Thermal, Flame-Retardant Properties of Wood Fiber Reinforced Ultra-High-Density Fiberboards

Investigation into Mechanical, Thermal, Flame-Retardant Properties of Wood Fiber Reinforced Ultra-High-Density Fiberboards

Coupled Crystal Plasticity–Phase Field Fracture Simulation Study on Damage Evolution Around a Void: Pore Shape Versus Crystallographic Orientation

Virtual characterization of MDF fiber network

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