K-0630 多軸応力下における木材の疲労強度と寿命予測(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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Fatigue strength of wood under a cyclic tension-torsion or compression-torsion combined loading were investigated experimentally. Material used for the experiments was a rectangular bar of Japanese cypress. Pulsating axial force and torsion combined loading were applied along and around the longitudinal axis of the specimen coincided with the longitudinal direction of the wood, respectively. The obtained results owed to the combined-stress ratios and the applied stress levels, and were summarized as follows: 1) Difference in the S-N plot between tension-torsion and compression-torsion was observed at the high stress level. At the high stress level, while the fatigue life under tension-torsion tended to be shorter than that under pure torsion, it under compression-torsion tended to be longer. 2) Hill's criterion for the static strength showed in better agreement to evaluate the fatigue strength under tension-shear combined-stress. 3) On the basis of the experimental results under tension-shear, the prediction of the fatigue strength and life under compression-shear were made.
2001-08-22