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EFFECT OF AXIAL LOAD ON TORSION FATIGUE BEHAVIOR OF WOOD

机译：轴向载荷对木材扭转疲劳行为的影响

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摘要

The torsion fatigue behavior of solid wood under cyclic torsion-axial combined loading was investigated. The test specimens used were air-dried Japanese cypress that were cut into sections of 17.5 mm (tangential) x 17.5 mm (radial), with their major axis lying along the fiber direction of 300 mm (longitudinal). A pulsating torsion with a triangular waveform was applied along the longitudinal axis of the specimens at 1 Hz, while the specimen was also simultaneously subjected to an axial (tension or compression) load at the same phase along the longitudinal direction, at stress levels corresponding to 50-100% of each static strength. The results obtained are summarized as follows: When tension was added to pure torsion, the inclination of the S-N curve tended to decrease as the tensile stress component increased. On the other hand, when compression was added to pure torsion, the S-N curve generally moved to the long-life side. The strength of the wood was different between dynamic and static modes, under not only pure loading but also axial-torsion combined loading. The torsion deformation under compression-torsion combined loading kept its initial value small until the increase before final failure, and this was considered to cause the lengtheningof the fatigue life under the stress state, in which shear and compression stress components were almost equal.
机译：研究了实木复合材料在循环扭转-轴向联合荷载作用下的扭转疲劳行为。使用的测试样品是风干的日本柏树，将其切成17.5 mm（切向）x 17.5 mm（径向）的部分，其长轴沿纤维方向300 mm（纵向）。沿试样的纵轴以1 Hz施加三角波形的脉动扭力，同时，试样还沿纵向在同一相位同时承受轴向（拉伸或压缩）载荷，应力水平对应于每种静态强度的50-100％。得到的结果总结如下：当在纯扭力上施加张力时，S-N曲线的倾斜度会随着张应力分量的增加而减小。另一方面，当对纯扭转施加压缩时，S-N曲线通常会移至长寿命侧。在动态模式和静态模式下，木材的强度都不同，不仅在纯载荷下，而且在轴向扭转组合载荷下。压扭复合载荷作用下的扭转变形一直保持较小的初始值，直至最终破坏前增大，这被认为是导致应力和剪切应力分量几乎相等的应力状态下疲劳寿命的延长。

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