抄録
In this study, the yield behavior of wood under the compression-shear stress conditions was examined by compression-torsion combined loading tests. The materials used for the experiment were Sitka spruce (Picea sitchensis Carr.) and katsura (Cercidiphyllum japonicum Sieb. and Zucc.). The compression load was applied along the longitudinal direction of the specimen, whereas the torsional moment was applied around the longitudinal direction. By varying the combined stress conditions, the couples of compression and shear stresses at the occurrence of yielding were obtained, and the applicability of three yield criteria, Hill-type, Gol'denblat-Kopnov's, and Jenkin's criteria, was examined.
Although the testing results were more close to Hill-type criterion than Jenkin's one for both species, it is still early to say that the yield behavior of wood under the compression-shear combined stress condition is described by Hill-type criterion precisely.
