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The Elastic Constants of Spruce as Influenced by Moisture

Published online by Cambridge University Press:  14 September 2016

Extract

Previous investigations on the effect of moisture on the elastic constants of spruce have been confined to its effect on Young's modulus in the direction of the grain. The most important work in this connection is probably that of H. D. Tiemann, who deduced curves for pine spruce and chestnut showing that Young's modulus along the grain decreased as the moisture increased up to the fibre saturation point, and that further addition of moisture had little or no effect on the value of the modulus. Tiemann thus found that the modulus decreased to a minimum at the fibre saturation point and then remained nearly constant and independent of any further addition of moisture. The reason for the independence of the modulus on the moisture beyond the fibre saturation point becomes evident if it is considered that when the fibres are saturated, any further moisture added is retained in the cells and in all probability cannot further affect the stiffness and strength of the wood.

Type
Research Article
Copyright
Copyright © Royal Aeronautical Society 1922

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References

page 462 note * U.S. Department of Agriculture, Forest Service Circ. 108, dated August, 1907.

page 463 note * Phil. Mag., June, 1921, and May, 1922.

page 463 note † Phil. Mag., Feb., 1921.

page 463 note ‡ Phil. Mag., June, 1921.

page 464 note * Phil. Mag., May, 1922.