Super-Strength Beams Laminated From Rotary-Cut Southern Pine Veneer

Very strong beams were made by arranging 42 laminae of 1/6-inch rotary-cut southern pine veneer so that the stiffest veneers were on the tension and compression flanges and the most limber in the center. Beams thus fabricated to a ,3–inch width and a 100-inch length averaged 13,280 p.s.i. stress in the outer laminae when failed in flexure. Modulus of elasticity averaged 2,330,000 p.s.i. Similarly arranged beams were further strengthened by having the outer 6 veneers on both tension and compression sides impregnated with polymethylmethacrylate and then irradiated. These beams withstood 15,030 p.s.i. stress and had an MOE of 2,570,000. Comparable beams strengthened by having the outer 6 laminae on both sides densified by heat and pressure a…