Piezoelectric behavior of wood under combined compression and vibration stresses -: I:: Relation between piezoelectric voltage and microscopic deformation of a Sitka spruce (Picea sitchensis Carr.)
Piezoelectric behavior of wood under combined compression and vibration stresses -: I:: Relation between piezoelectric voltage and microscopic deformation of a Sitka spruce (Picea sitchensis Carr.)
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DOI：
10.1007/bf00521871
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发表时间：
1998-01-01
影响因子：
2.9
通讯作者：
Ando, K
中科院分区：
文献类型：
--
作者：
Nakai, T;Igushi, N;Ando, K
本文研究了在压缩和振动复合应力作用下，波纹管在真实的时间内的变形与压电行为之间的关系。扫描电子显微镜图像直接记录到录像机中。在标本中观察到两种类型的微观破坏。第一种类型，虽然在年轮边界附近观察到一个小的隆起，但试样仅在45度方向上通过剪切断裂而断裂。第二类是试件在反复屈曲后发生剪切断裂。在这些情况下，压电电压几乎线性增加的弹性区域，进行到最大点，然后逐渐下降。最终屈曲剪切断裂出现明显的峰值。当考虑孔隙的影响时，材料的比重与压电参数之间存在曲线关系;当考虑应力的影响时，材料的动态杨氏模量与压电参数之间存在线性关系。
This study investigated the relation between piezoelectric behavior and the deformation of trachieds in real time under combined compression and vibration stresses. Scanning electron microscope images were recorded directly into a video recorder. Two types of microscopic destruction were observed in the specimens. With the first type, although a small uprush around the boundary of the annual ring was observed, the specimens were broken only by shearing fracture in the 45 degrees direction. With the second type, the specimens were finally broken by shearing fracture after repeated buckling. In these cases the piezoelectric voltage increased almost linearly in the elastic region, proceeded to the maximal point, and then decreased gradually. Finally a clear peak appeared in the buckling and shearing fracture. There is a curved relation between the specific gravity and the piezoelectric parameter when the influence of voids is considered, and there is a linear relation between the dynamic Young's modulus and the piezoelectric parameter when the stress is considered.