The Mechanical Properties of Wood eBook

This eBook from the Gutenberg Project consists of approximately 160 pages of information about The Mechanical Properties of Wood.

The Mechanical Properties of Wood eBook

This eBook from the Gutenberg Project consists of approximately 160 pages of information about The Mechanical Properties of Wood.
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----------------| | TABLE XV | |-----------------------------------------------------------
-----------| | EFFECT OF DRYING ON THE MECHANICAL PROPERTIES OF WOOD, SHOWN IN | | RATIO OF INCREASE DUE TO REDUCING MOISTURE CONTENT FROM | | THE GREEN CONDITION TO KILN-DRY (3.5 PER CENT) | | (Forest Service Bul. 70, p. 89) | |-----------------------------------------------------------
-----------| | KIND OF STRENGTH | Longleaf | Spruce | Chestnut | | | pine | | | |----------------------------+-------------+-------------+--
-----------| | | (1) (2) | (1) (2) | (1) (2) | | | | | | | Crushing strength parallel | | | | | to grain | 2.89 2.60 | 3.71 3.41 | 2.83 2.55 | | Elastic limit in | | | | | compression | | | | | parallel to grain | 2.60 2.34 | 3.80 3.49 | 2.40 2.26 | | Modulus of rupture in | | | | | bending | 2.50 2.20 | 2.81 2.50 | 2.09 1.82 | | Stress at elastic limit in | | | | | bending | 2.90 2.55 | 2.90 2.58 | 2.30 2.00 | | Crushing strength at right | | | | | angles to grain | | 2.58 2.48 | | | Shearing strength parallel | | | | | to grain | 2.01 1.91 | 2.03 1.95 | 1.55 1.47 | | Modulus of elasticity in | | | | | compression parallel to | | | | | grain | 1.63 1.47 | 2.26 2.08 | 1.43 1.29 | | Modulus of elasticity in | | | | | bending | 1.59 1.35 | 1.43 1.23 | 1.44 1.21 | |-----------------------------------------------------------
-----------| | NOTE.--The figures in the first column show the relative increase in | | strength between a green specimen and a kiln-dry specimen of equal | | size.  The figures in the second column show the relative increase of | | strength of the same block after being dried from a green condition | | to 3.5 per cent moisture, correction having been made for shrinkage. | | That is, in the first column the strength values per actual unit of | | area are used; in the second the values per unit of area of green | | wood which shrinks to smaller size when dried. | | | | See also Cir. 108, Fig. 1, p. 8. |
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The Mechanical Properties of Wood from Project Gutenberg. Public domain.