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Related Concept Videos

Softwoods and Hardwoods01:28

Softwoods and Hardwoods

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Softwoods and hardwoods, derived from different types of trees, are distinguished by their leaf structures and cellular compositions, each serving unique purposes in construction and manufacturing. Softwoods come from cone-bearing trees with needle-like leaves and are predominantly composed of longitudinal cells called tracheids and a smaller proportion of radial cells known as rays. Due to their cellular structure, softwoods are commonly used in construction for structural frames, sheathing,...
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Bending of Members Made of Several Materials01:11

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Mechanistic models, a category encompassing both physiological and compartmental modeling, differ from empirical models' approaches to incorporating known factors about the systems being modeled. Empirical models describe data with minimal assumptions, while mechanistic models aim to provide a robust description of available data by specifying assumptions and integrating known factors about the system. Compartmental analysis is a key example of a mechanistic model in pharmacokinetics and...
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Structural Properties and Dimensions of Lumber01:21

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Wood's structural properties derive from fibers aligned along the tree's length, contributing significantly to its mechanical strength. Wood exhibits up to twenty times greater tensile strength along these fibers compared to across them, and generally shows better performance under compression than tension. The length of fibers varies, with hardwoods having fibers around one twenty-fifth inch long and softwoods ranging from one-eighth to one-third inch.
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Indeterminate Structure01:18

Indeterminate Structure

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Indeterminate structures refer to structures where internal forces and reactions cannot be determined using only the equations of static equilibrium.  Indeterminate structures have more unknown forces and reaction forces than equations of static equilibrium that can be used to determine them. Indeterminate structures are often used in engineering to create complex, efficient, and aesthetically pleasing structures. There are various types of indeterminate structures used in engineering and...
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A Millimeter Scale Flexural Testing System for Measuring the Mechanical Properties of Marine Sponge Spicules
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Structure-function relationships in hardwood--insight from micromechanical modelling.

K de Borst1, T K Bader2

  • 1University of Glasgow, School of Engineering, Rankine Building, Oakfield Avenue, Glasgow G128LT, United Kingdom.

Journal of Theoretical Biology
|December 25, 2013
PubMed
Summary

This study presents a micromechanical model to predict wood stiffness in three directions. The model accurately predicts stiffness across species, revealing vessels reduce stiffness while ray cells reinforce it radially.

Keywords:
Hardwood cell structureMultiscale modellingRay and vessel microstructureWood mechanics

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Area of Science:

  • Wood science
  • Materials science
  • Biomechanics

Background:

  • Wood stiffness is crucial for structural applications.
  • Understanding the relationship between wood's microstructure and its mechanical properties is essential.
  • Existing models often lack the ability to predict stiffness across diverse hardwood species.

Purpose of the Study:

  • To develop a micromechanical model predicting the stiffness of wood tissues in three principal anatomical directions.
  • To validate the model's accuracy across various European and tropical hardwood species.
  • To investigate the influence of microstructural features, specifically vessels and ray cells, on wood stiffness.

Main Methods:

  • A micromechanical model was developed starting from the stiffness of wood polymers: cellulose, hemicellulose, and lignin.
  • Seven homogenization steps were employed to link polymer stiffness to macroscopic wood stiffness.
  • The model's predictions were compared against experimental data from ten different hardwood species.

Main Results:

  • The model accurately predicted wood stiffness in the three principal anatomical directions for ten hardwood species.
  • Vessels were identified as features that reduce wood stiffness at a constant density.
  • Ray cells were found to act as reinforcing elements in the radial direction.

Conclusions:

  • The developed micromechanical model is a functional and accurate tool for predicting wood stiffness.
  • The findings highlight a trade-off between hydraulic efficiency and mechanical support in wood's anatomical design.
  • The model provides insights into how microstructural elements influence the overall mechanical behavior of wood.