柞木横纹压缩流变性能

The Rheological Behavior of Mongolian Oak (Quercus mongolica) in Compression perpendicular to Grain

对于柞木(Quercus mongolica),用参数分离法测定其横纹压缩流变参数后表明:弹性变形与恒压应力在很大的范围内成直线关系,瞬间塑性变形与恒压应力成为几个阶段的直线关系;推迟弹性及依赖于时间的塑性都遵循以对数为主体的函数,由弹性及推迟弹性合成的粘弹性具有很好的线性特征。以上研究结果与白杨试验所得结果几乎一致。因此,柞木与白杨之间的横纹压缩流变性能并无质的不同,仅仅表现出量的差别。白杨与柞木之比:弹性柔量为2.4～3.4:1;推迟弹性柔量为1.8～2.7:1;临界应力为1:2。

Rheological parameters of Mongolian Oak in compression perpendicular to grain was determined by the method of Separating the rheological parame ters. The results indicated: the linear relationship between elastic deformation and constant compression stress existed in wide stress range; the instantaneous plastic deformation in different sections was separately dependent on the stress linearly; the behavior of retarded elasticity and plasticity depending on time was mainly experssed in terms of logarithmic function; the behavior of viscoelasticity consisting of elasticity and retarded elasticity was closely corresponding with linear viscoelasticity. The results were almost the same as the results obtained from Poplar. Therefore, the differences on rheological properties between Poplar and Mongolian Oak existed in quantitative aspect only. The ratio of the rheglogical parameters between Poplar and Mongolian Oak respectively is as follows: 1) 2.4—3.4: 1 for elastic compliance; 2) 1.8—2.7: 1 for retarded elasticity. The ratio of the critical stress between Poplar and Mong0Iian Oak in compression perpendicular to grain was 1: 2.