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Uniaxial compression of rotationally symmetric Norway spruce samples: surface deformation and size effect

机译：旋转对称挪威云杉样品的单轴压缩：表面变形和尺寸效应

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摘要

The influence of size on strength is well known for various materials and testing methods, but not enough data and knowledge of the effect on wood under compressive strength can be found. Therefore, the deformation and compressive strength of hyperboloid Norway spruce samples were tested for different dimensions. To determine the influence of size on the strength, three different approaches were used: "weakest link theory", "size effect law" and "multifractal scaling law". Of the three scaling theories, the "size effect law" and the "weakest link theory" predicted the effect well. Additionally, to determine the surface deformation of various samples, DIC3D was used on the largest sample geometry. The experiments show the existence of a possible size effect during compression, while digital image correlation illustrates the expected differences in deformation due to the shape and dependence of the strain distribution on the structure of wood. Additional experiments are proposed to further verify the observed effects and expand the knowledge of the size effect.
机译：尺寸对强度的影响对于各种材料和测试方法是众所周知的，但是找不到足够的数据和抗压强度对木材的影响的知识。因此，对双曲面挪威云杉样品的变形和抗压强度进行了不同尺寸的测试。为了确定尺寸对强度的影响，使用了三种不同的方法：“最弱链接理论”，“尺寸效应定律”和“多重分形标度定律”。在这三种定标理论中，“规模效应定律”和“最弱联系理论”很好地预测了这种效应。此外，为了确定各种样品的表面变形，将DIC3D用于最大的样品几何形状。实验表明在压缩过程中可能存在尺寸效应，而数字图像相关性说明了由于形状和应变分布对木材结构的依赖性而导致的预期变形差异。提出了其他实验，以进一步验证观察到的效果并扩大对尺寸效果的了解。

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  • 来源
    《Wood Science and Technology》 |2014年第5期|1019-1032|共14页
  • 作者

    Michaela Zauner; Peter Niemz;

  • 作者单位

    Department of Civil, Environmental and Geomatic Engineering, Institute for Building Materials, ETH Zurich, 8093 Zurich, Switzerland;

    Department of Civil, Environmental and Geomatic Engineering, Institute for Building Materials, ETH Zurich, 8093 Zurich, Switzerland;

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