PROPORTIONAL LIMIT AND VISCOELASTICITY OF WOOD
PROPORTIONAL LIMIT AND VISCOELASTICITY OF WOOD
复制标题
木材的比例极限和粘弹性
DOI：
10.3130/aijs.76.1951
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
H. Kuwamura
中科院分区：
文献类型：
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作者：
H. Kuwamura
以比例极限为重点，研究了杉木在不同应力速率下L、R和45度方向的粘弹性对应力-应变曲线的影响。无论对晶粒进行何种方向的加载，还是对应力速率从慢到快的加载，切线模量都随应力的升高而逐渐减小。这表明所谓的比例极限在确切意义上是不存在的。一个三元素模型解释了被测木材的粘弹性，使得弹簧常数不受应力率和应力重复的影响，就像胡克体一样，而阻尼器对它们很敏感，不像牛顿线性流体。
Compression tests of Japanese cedar in its L, R, and 45-degree directions under various stress rates were done in order to investigate the viscoelastic effect on the stress-strain curves with a focus on the proportional limit. The tangent modulus decreased gradually with the elevation of stress either for any direction of loading to the grain and for any stress rate of slow to fast loading. This suggests that the so-called proportional limit does not exist in an exact sense. A three-element model interpreted the viscoelasticity of the tested wood such that the spring constant is free from stress rates as well as stress repetitions like the Hookean body, while the dashpot is sensitive to them unlike the Newtonian linear fluid.