Verification of Mukudai's mechano-sorptive model
Verification of Mukudai's mechano-sorptive model
复制标题
Mukudai 机械吸附模型的验证
DOI：
10.1007/bf00353227
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发表时间：
1988
影响因子：
3.4
通讯作者：
S. Yata
中科院分区：
文献类型：
--
作者：
J. Mukudai;S. Yata
Mukudai和Yata在以前的报告中对机械吸附行为的解释是，木材在水分变化下的粘弹性行为的特征可能是由于由于S1和S2层之间的松弛引起的含水量变化引起的S1和S2层之间的摩擦力变化引起的细胞壁中施加应力的重新分布，在此基础上，提出了机械吸附模型，为寻找支持机械吸附行为是由S1和S2层之间的疏松引起的解释的证据，用电子显微镜观察了在湿含量变化的蠕变过程中通过增加载荷而断裂的试样的表面。通过与试验结果的对比，验证了计算机模拟得到的15%、30%和45%应力水平下的机械吸附蠕变和回复挠度曲线的特征，发现断裂发生在梁受拉侧单元中S1和S2层的界面处，S1和S2层界面处的裂缝在断裂面各处发生。此外，由模拟得到的蠕变和恢复挠度曲线的特征与试验结果吻合较好。
Mukudai and Yata have shown in the previous reports an interpretation of mechano-sorptive behavior that characteristic of viscoelastic behavior of wood under moisture change may be resulted from redistribution of applied stress in the cell wall because of change of friction between the S1and S2layers induced by moisture content change due to the looseness between the both layers, and have proposed a mechano-sorptive model based on the interpretation.In this report, to find out evidence supporting the interpretation that mechano-sorptive behavior is resulted from the looseness between the S1and S2layers, surfaces of specimens fractured by increasing load during creep under moisture content change were observed with electron microscopes. And, characteristic features of mechano-sorptive creep and recovery deflection curves at 15%, 30% and 45% stress levels which were obtained by computer simulation were checked by comparison with those of the corresponding experiments.As the results, it could be observed that fractures took place at the interface of the S1and S2layers in cells of the tension side of beams, and splits at the interface of the S1and S2layers took place here and there in the fractured surfaces. Furthermore, the characteristic features of creep and recovery deflection curves obtained by the simulations agreed well with those of the experiments.