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首页> 外文会议>International Symposium on Nondestructive Testing of Wood; 20000913-20000915; Sopron; HU >Kaiser effect experiments in wood by acoustic emission testing
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Kaiser effect experiments in wood by acoustic emission testing

机译：通过声发射测试在木材中进行Kaiser效应实验

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摘要

It is well known in the field of metal research that if the metal is loaded with a certain force then the load is taken away, in the next loading period the material does not show acoustic activity, while the stress reaches the maximum of the last load. This is called Kaiser effect. The question is whether the wood shows this effect or not? The examination consisted of short term experiments - also with changed moisture content and temperature - and longer term experiments. The second loading period followed the previous one directly in short term experiments and in 1 or 2 months in the case of longer term tests. The tested species was Scots pine. The investigation proved that Scots pine shows the Kaiser effect during short term experiments. However the more time elapses till the second loading period the less the effect can be observed . Also the significant change in moisture content and temperature results in disappearing of the Kaiser effect. The results help us to understand the special behaviour of wood, namely, it gives a possible answer why the wood does not show the Kaiser effect in the first loading period while living trees endure loads of wind and snow up to the 50-60% of its ultimate strength.
机译：在金属研究领域众所周知，如果以一定的力加载金属，那么该负载就会被带走，在下一个加载期间，材料不会表现出声活动，而应力会达到最后一次加载的最大值。这称为凯撒效应。问题是木材是否显示出这种效果？该检查包括短期实验-水分含量和温度变化-以及长期实验。在短期实验中，第二个加载期直接在前一个加载期之后；对于长期测试，则在1或2个月后。测试的物种是苏格兰松树。调查证明，苏格兰松树在短期实验中显示出Kaiser效应。但是，到第二次加载阶段所花费的时间越多，所观察到的效果就越小。水分含量和温度的显着变化也导致Kaiser效应的消失。结果有助于我们了解木材的特殊性能，即，它给出了一个可能的答案，即为什么木材在第一个加载期间没有表现出Kaiser效应，而活树却承受了风雪的50-60％的负荷。它的极限力量。

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