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RESEARCH PAPERS

A Stress Model for Lumber Drying Control

[+] Author and Article Information
R. A. Lessard

Electrical Engineering Department, Norwich University, Northfield, Vt. 05663

D. E. Limbert

Mechanical Engineering Department, University of New Hampshire, Durham, N.H. 03824

J. L. Pokoski

Electrical Engineering Department, University of New Hampshire, Durham, N.H. 03824

J. L. Hill

Institute of Natural and Environmental Resources, University of New Hampshire, Durham, N.H. 03824

J. Dyn. Sys., Meas., Control 104(4), 283-289 (Dec 01, 1982) (7 pages) doi:10.1115/1.3139710 History: Received March 17, 1980; Online July 21, 2009

Abstract

Rapid changes in lumber value and energy costs have forced concern for more efficient lumber drying and a higher quality end product. Computer automation provides a practical solution to this problem. Mathematical predictions of moisture loss and shrinkage induced stress are required for effective automation. In response to this need an elastic-plastic hysteresis stress model to predict stresses in boards during kiln drying was developed. The model prediction is compared to experimental data for release strain, set strain, prong deflection, and board failures.

Copyright © 1982 by ASME
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