1A-03

Biomechanics of Wheat/Barley Straw and Corn Stover

Christopher T. Wright,* Peter A. Pryfogle, Nathan Stevens,

Eric D. Steffler and J. Richard Hess

Idaho National Engineering and Environmental Laboratory

P.O. Box 1625

Idaho Falls, Idaho 83415-2210

(208) 526-4638

Fax (208) 526-0690

wrigct@inel.gov

The lack of data describing the structural characteristics and mechanical behavior of cellulosic feedstocks is a limiting factor for the economic collection and prepossessing of crop residues, primarily wheat/barley stems and corn stover.  The biomechanical data from these crop residues will be used to develop computer models that will help advance selective, single-pass harvesting techniques and increase the efficiencies of bulk handling methods.  Several testing methods, including compression, tension, torsion, bend, and shear, have been developed to increase our understanding of the structural characteristics and mechanical behavior of cellulosic feedstocks.  These methods are performed with miniature and full-size load frames to accommodate both wheat/barley steams and corn stover.  Video imaging techniques were used to follow and confirm load test measurements collected simultaneously.  Microscopic analyses were performed on feedstock samples to identify changes in structural components based on the type of test conducted and to compare modes of failure among the varieties tested.  Each test provided a range of mechanical data from different parts of the plant and from different varieties of wheat/barley and corn.  Results from the mechanical testing show a 15% difference in the compressive modulus for two varieties of wheat and a 20% difference for two varieties of barley allowing the collection and preprocessing methods to be tailored to the specific types of plants.