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首页> 外文会议>2003 International Paper Physics Conference >TENSILE AND ULTRASONIC STIFFNESS OF PAPER AT DIFFERENT MOISTURES - A CLARIFICATION OF THE DIFFERENCES
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TENSILE AND ULTRASONIC STIFFNESS OF PAPER AT DIFFERENT MOISTURES - A CLARIFICATION OF THE DIFFERENCES

机译：不同水分下纸张的拉伸和超声刚度-差异的澄清

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摘要

A clarification of the difference between the tensile and the ultrasonic stiffness indices of paper is provided. It is emphasized that the material response of paper is typical of many polymers. As a consequence, the primary difference in the two measurements is due to the time dependent behavior and the very different time scales involved in the two measurements. Secondary differences are due to differences in stress states, limitations of the experimental techniques employed, or experimental errors. To eliminate any confusion and clarify the meaning of these two measurements, the literature is critically reviewed, experiments are conducted, and a discussion provided. Specifically, tensile and ultrasonic stiffness indices for a range of papers and moisture ratios are determined. It is argued that moisture acts as a plasticizer, which decreases the stiffness and amplifies the difference between the tensile and ultrasonic measurements. MD and CD directional sensitivity is a result of both fiber orientation and drying restraints since the amount of amorphous load bearing components varies with direction.
机译：提供了纸张的拉伸和超声刚度指数之间差异的澄清。要强调的是，纸的材料响应是许多聚合物的典型特征。结果，两次测量中的主要差异是由于时间相关的行为以及两次测量中涉及的非常不同的时间标度。次要差异是由于应力状态的差异，所采用的实验技术的局限性或实验错误引起的。为了消除任何混淆并阐明这两种测量的含义，对文献进行了严格审查，进行了实验并提供了讨论。具体而言，确定了一系列纸张的拉伸强度和超声刚度指数以及水分比。有人认为，水分起增塑剂的作用，它会降低刚度并扩大拉伸和超声测量之间的差异。 MD和CD方向敏感性是纤维取向和干燥限制的结果，因为非晶态承重成分的数量随方向变化。

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