caa a22 4500 397521235 CHVBK 20180308164633.0 cr unu---uuuuu 161202e199508 xx s 000 0 eng 10.1093/jxb/46.8.981 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.8.981 Vogel Steven Department of Zoology, Duke University, Durham, NC 27708-0325, USA Twist-to-bend ratios of woody structures [Elektronische Daten] [Steven Vogel] Flexural rigidity (El), or resistance to bending loads, and torsional rigidity (GJ), or resistance to twisting loads, were measured on a variety of woody structures-bamboo culms, three kinds of hardwood trunks, two softwood trunks, two vines, and pine roots. The ratios of these rigidities, EI/GJ, was highest and relatively constant for bamboo and hardwoods, slightly lower for softwoods, and lower still for vines and roots. All values were substantially above those for circular cylinders of ordinary isotropic materials; since all specimens were nearly circular in cross-section, the high values reflect the elastic moduli of wood rather than geometric factors. While all material showed substantial creep under torsional loading, only the vine, Wisteria, crept appreciably under flexural loading as well. © Oxford University Press Research Papers nationallicence Wood nationallicence trees nationallicence flexural rigidity nationallicence torsional rigidity nationallicence biomechanics nationallicence Journal of Experimental Botany Oxford University Press 46/8(1995-08), 981-985 0022-0957 46:8<981 1995 46 exbotj https://doi.org/10.1093/jxb/46.8.981 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.8.981 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Vogel Steven Department of Zoology, Duke University, Durham, NC 27708-0325, USA NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/8(1995-08), 981-985 0022-0957 46:8<981 1995 46 exbotj Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford