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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >ON THE OPPOSITE EFFECT FLUID LOADING HAS ON THE VELOCITY OF DILATATIONAL WAVES IN THIN PLATES AND RODS
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ON THE OPPOSITE EFFECT FLUID LOADING HAS ON THE VELOCITY OF DILATATIONAL WAVES IN THIN PLATES AND RODS

机译：对薄板和杆中的扩散波速度有相反的影响

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摘要

Our main goal in this paper was to experimentally verify our earlier analytical predictions that radiation loading increases the velocity of the dilatational mode in thin plates and decreases it in thin rods. The relative change in the velocity of the dilatational mode in thin plates and rods was measured over a substantially wide frequency range. Simple theoretical considerations showed that, in the case of the rod, the frequency range over which the negative radiation loading effect can be unequivocally observed is very narrow. The problem is less serious in the case of the plate as the positive radiation loading effect is maintained to much higher frequencies where viscosity effects are negligible. Because of these limitations the agreement between the experimental results and the theoretical predictions was better in the case of the plate as compared to the rod. Although the accuracy of the measurements in the case of the rod (± 0.015%) is slightly better than that in the case of the plate (± 0.03%), the absolute value of the detectable velocity change is much less for the rod than for the plate, therefore positive verification of the predicted velocity change is more difficult in the case of the rod. Generally, the agreement between the experimental results and the theoretical predictions in both cases of thin plates and rods was very good. The conducted experiments unequivocally verified that radiation loading decreases the velocity of the dilatational wave in thin rods and increases it in thin plates. Up to our knowledge, these measurements constitute the first experimental verification of this previously reported opposite effect.
机译：本文的主要目的是通过实验验证我们较早的分析预测，即辐射载荷会增加薄板中的扩张模速度，而减小细棒中的扩张模速度。在相当宽的频率范围内测量了薄板和棒中膨胀模式速度的相对变化。简单的理论考虑表明，在棒的情况下，可以明确观察到负辐射负荷效应的频率范围非常窄。在印版的情况下，该问题不太严重，因为在可以忽略粘度影响的情况下，将正辐射加载效果维持到更高的频率。由于这些限制，与棒相比，在板的情况下，实验结果与理论预测之间的一致性更好。尽管在杆的情况下（±0.015％）的测量精度比在板的情况下（±0.03％）的测量精度稍好，但杆的可检测速度变化的绝对值比杆的情况要小得多。板，因此，在杆的情况下，要对预计的速度变化进行可靠的验证更加困难。通常，在薄板和棒的情况下，实验结果与理论预测之间的一致性非常好。进行的实验明确地证明，辐射载荷降低了细棒中的膨胀波的速度，并减小了薄板中的膨胀波的速度。据我们所知，这些测量值是对先前报道的相反作用的首次实验验证。

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