Creep of Wood After Soaking in Liquid Anhydrous Ammonia

In order to relate soak time to degree of plasticity for black cherry (Prunus serotina Ehrh.) specimens 19 inches long, 1 inch wide, and of varying thicknesses and moisture contents were soaked from 30 to 960 minutes in liquid anhydrous ammonia. Treatment was at room temperature and 180 psi pressure. After treatment, the samples were dead-loaded as a simple beam with a load sufficient to cause a maxim bending moment of 0.012 lb. in. The optimum moisture content for treatment was found to be 11 percent. When bending to a short radius of curvature, the maxium practical thickness was around 3/16 inch. A treatment time of 240 minutes was found to be adequate for bending the 3/16-inch material.

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