Mechanical, Physical, and Machining Properties of Black Walnut From Indiana and Missouri

Authors

  • David R. Schumann

Keywords:

<i>Juglans nigra</i>, wood quality, specific gravity, volumetric shrinkage, hardness, toughness

Abstract

The relationships of the anatomical characteristics and physical features of black walnut to the machining and mechanical properties were investigated. The influence of geographic location, site quality, and growth conditions on these properties was also examined. Machining properties of black walnut were satisfactory regardless of locality, site, growth rate, and anatomical characteristics.

Specific gravity influenced the machining and mechanical properties of black walnut more than any other feature. Specific gravity increased slightly with an increase in growth rate.

Indiana-grown black walnut heartwood contained less extractive material and conscquently shrank more than Missouri-grown wood. Good sites, regardless of location, produced tougher wood than poor sites.

References

American Society for Testing and Materials. 1970. Standard methods of testing small clear specimens of timber. ASTM D 143-52. Philadelphia, Pa.nDavis, E. M. 1962. Machining and related characteristics of United States hardwoods. USDA Tech. Bull. 1267. 68 pp., illus.nEnglerth, G. H. 1966. Machining and other properties of fast versus slow grown trees. Pages 77-82, in Black walnut culture, USDA For. Serv., No. Cent. For. Exp. Sta., St. Paul, Minn.nHiller, C. H., F. Freese, and D. M. Smith. 1972. Relationships in black walnut heart-wood between color and other physical and anatomical characteristics. Wood Fiber 4(1):38-42.nMoslemi, A. A. 1967. Quantitative color measurement for black walnut wood. USDA For. Serv. Res. Paper NC-17 No. Cent. For. Exp. Sta., St. Paul, Minn.nNelson, N. D., R. R. Maeglin, and H. E. Wahlgren. 1969. Relationship of black walnut wood color to soil properties and site. Wood Fiber 1(1):29-37.nPaul, B. H. 1963. The application of silviculture in controlling the specific gravity of wood. USDA Tech. Bull. 1288. 97 pp., illus.nWood Handbook. 1955. Forest Products Laboratory, USDA Agric. Handb. 72. 528 pp., illus.n

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Published

2007-06-05

Issue

Number 1 / Spring 1973

Section

Research Contributions

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