K-0629 多軸応力下の疲労における木材の変形挙動(G03-8 疲労・変形・損傷評価)(G03 材料力学部門一般講演)

概要

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Deformation behavior (stress-strain properties) of wood during a cyclic compression-torsion or tension-torsion combined loading were investigated experimentally. Materials used for the experiments were rectangular bars of Japanese cypress (Chamaecyparis obtusa Endl.). Axial force and torque were applied along and around the longitudinal axis of the specimen coincided with the longitudinal direction of the wood, respectively. The obtained results were summarized as follows: 1) While the compressive load-strain curves mostly unchanged during a fatigue test, the torque-shear strain curves were changed owing to the cyclic loading. 2) As a whole, the energy loss per one cycle by torsion was larger than that by compression. 3) The change of the compressive stiffness during a cyclic loading showed a similar tendency regardless of the biaxial combined stress ratios and the applied stress levels. 4) As for the effects of the axial stress components on the changes of the torsional elastic properties during fatigue tests, the experimental results under compression-torsion were different from those under tension-torsion.
2001-08-22