Author: Green, David W.; White, Robert H.; TenWolde, Antoni; Simpson, William; Murphy, Joseph; Ross, Robert J.; Hernandez, Roland; Lebow, Stan T.
Source: Marks' standard handbook for mechanical engineers. New York : McGraw-Hill, 2006: ISBN: 0071428674: 9780071428675: Pages 6.115-6.131
Publication Series: Not categorized
Description: Wood is a naturally formed organic material consisting essentially of elongated tubular elements called cells arranged in a parallel manner for the most part. These cells vary in dimensions and wall thickness with position in the tree, age, conditions of growth, and kind of tree. The walls of the cells are formed principally of chain molecules of cellulose, polymerized from glucose residues and oriented as a partly crystalline material. These chains are aggregated in the cell wall at a variable angle, roughly parallel to the axis of the cell. The cells are cemented by an amorphous material called lignin. The complex structure of the gross wood approximates a rhombic system. The direction parallel to the grain and the axis of the stem is longitudinal (L), the two axes across the grain are radial (R) and tangential (T) with respect to the cylinder of the tree stem. This anisotropy and the molecular orientation account for the major differences in physical and mechanical properties with respect to direction which are present in wood.
Keywords: Wood density, wood moisture, composite materials, mechanical properties, lumber, wood chemistry, lignin, structure, wood, nomenclature, mechanical properties, wood properties, thermal properties, elasticity, wood, wood construction
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
XML: View XML
Green, David W.; White, Robert H.; TenWolde, Antoni; Simpson, William; Murphy, Joseph; Ross, Robert J.; Hernandez, Roland; Lebow, Stan T. 2006. Wood. Marks'' standard handbook for mechanical engineers. New York : McGraw-Hill, 2006: ISBN: 0071428674: 9780071428675: Pages 6.115-6.131
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility