Dynamic Mechanical Behavior of Black Cherry (<i>Prunus Serotina</i> EHRH.)
Keywords:Prunus serotina, thermodynamic properties, dynamic modulus of elasticity, internal friction, moisture content
AbstractThe dynamic mechanical properties of black cherry (Prunus serotina Ehrh.) have been investigated as a function of temperature at audio frequencies. Relaxation processes are evident near 200, 360, and 510 K. The process near 200 K was investigated as a function of initial moisture content (based on mass measurements prior to testing). At moisture contents greater than about 20%, the damping peak is centered near 185 K. This relaxation shifts with moisture content, and at moisture contents below 6%, the peak is centered near 225 K. The relaxation in the 360 K region is also associated with initial moisture content. For oven-dry black cherry specimens, the dynamic mechanical properties in the 360 K region are nearly temperature-independent. The relaxation near 510 K is believed to be associated with thermal degradation of wood constituents that are known to degrade in that temperature region.
Beall, F. C., and H. W. Eickner. 1970. Thermal degradation of wood components: a review of the literature. U.S. Forest Service Research Paper. FPL 130:1-26.nBernier, G. A., and D. E. Kline. 1968a. Dynamic mechanical behavior of birch compared with methyl methacrylate impregnated birch from 90 to 475 K. For. Prod. J. 18(4):79-82.nBernier, G. A., and D. E. Kline. 1968b. Dynamic mechanical behavior of a polyimide. J. Appl. Polym. Sci. 12:593-604.nBlankenhorn, P. R. 1972. Dynamic mechanical behavior of black cherry (Prunus serotina Ehrh.). Ph.D. Thesis. Pennsylvania State University, University Park, Pa.nDiener, R. G., F. H. Buelow, and G. E. Mase. 1968. Viscoelastic analysis of the behavior and properties of cherry bark and wood under static and dynamic loading. ASAE 2(3):323-331.nDunell, B. A., and S. J. W. Price. 1955. Dispersion of mechanical properties of viscose rayon at low temperature. J. Polym. Sci. 18: 305-306.nFukada, E. 1950. The vibrational properties of wood I. J. Phys. Soc. Jap. 5:321-327.nFukada, E. 1951. The vibrational properties of wood II. J. Phys. Soc. Jap. 6:417-421.nHearmon, R. F. S. 1958. The influence of shear and rotatory inertia on the free flexural vibration of wooden beams. Brit. J. Appl. Phys. 9:381-388.nJames, W. L. 1961. Effect of temperature and moisture content on: internal friction and speed of sound in Douglas fir. For. Prod. J. 11(9):383-390.nJayne, B. A. 1955. A non-destructive test of glue bond quality. For. Prod. J. 5(5):294-301.nJayne, B. A. 1959. Indices of quality… vibrational properties of wood. For. Prod. J. 9(11):413-416.nKimura, M., H. Hatakeyama, M. Usuda, and J. Nakano. 1972. Studies on adsorbed water in cellulose by broad-line NMR. J. Appl. Polym. Sci. 16:1749-1759.nKline, D. E. 1956. A recording apparatus for measuring the dynamic mechanical properties of polymers. J. Polym. Sci. 22:449-454.nKline, D. E., R. P. Kreahling, and P. R. Blanken-horn. 1972. Dynamic mechanical properties and structure of white ash (Fraxinus americana L.) wood. Pages 185-205 in Advances in polymer science and engineering. Plenum Press, New York.nKollmann, F., and H. Krech. 1960. Dynamische Messung der elastischen Holzeigen-schaften und Dampfung. Holz Roh-Werkst. 18(2):41-54.nMackay, G. D. M. 1967. Mechanism of thermal degradation of cellulose: a review of the literature. Canada Department of Forestry and Rural Development, Forestry Branch, Dept. Pub. 1201, O.D.C. 813(4):1-20.nMoslemi, A. A. 1968. A study of moisture content gradients in wood by vibrational techniques. Wood Sci. 1(2):77-85.nPentoney, R. E. 1955. Effect of moisture content and grain angle on the internal friction of wood. Compos. Wood 2:131-136.nStepanov, V. I., B. S. Chudinov, and L. V. Kashkina. 1968. Zh. Khim. ABIPC 39(10):8783.nSuzuki, M. 1962. The effects of water-sorption and temperature on dynamic Young's modulus and logarithmic decrement of wood. J. Jap. Wood Res. Soc. 8(1):13-18.nTang, R. C., and N. N. Hsu. 1972. Dynamic Young's moduli of wood related to moisture content. Wood Sci. 5(1):7-14.nWoodward, A. E., and J. A. Sauer. 1965. Mechanical relaxation phenomena. Pages 637-723 in Physics and chemistry of the organic solid state. Interscience Publishers, New York.n
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.