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首页> 外文期刊>Journal Of Theoretical And Applied Mechanics >MODELLING OF ACOUSTIC EMISSION SOURCE AND WAVE RESPONSE IN LAYERED MATERIALS
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MODELLING OF ACOUSTIC EMISSION SOURCE AND WAVE RESPONSE IN LAYERED MATERIALS

机译:层状材料中声发射源和波响应的建模

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This study proposes a model of wave propagation in layered media for the use in acoustic emission (AE) studies. This model aims to find an AE response at a free surface to the propagating waves originating at a dislocation source either in one layer medium or a layer-to-layer interface. Each of the layered media is assumed to be homogenous, linear elastic and isotropic. An integral transformation method has been applied to determine the wave response in frequency-wave number domain, which is then converted to time-space domain. In the numerical examples, we first select truncated values with the finite integral transformation, so that no wave interference happens in the responses from wave reflection at truncated boundaries. Next, we simulate wave propagation in an elastic half space, and compare results obtained with that from other kind bottom boundary. Next, we introduce a dis- location source in interface and compare a simulated AE wave response obtained with that computed in the layered medium to demonstrate the performance of the model. In each simulation, the results show good agreement with the reference solutions.
机译:这项研究提出了一种用于声发射(AE)研究的分层介质中波传播的模型。该模型旨在找到自由表面对层介质或层与层界面中的位错源所产生的传播波的AE响应。假定每个分层介质是均质的,线性弹性的和各向同性的。已经应用积分变换方法来确定频率-波数域中的波响应,然后将其转换为时空域。在数值示例中,我们首先通过有限积分变换选择截断值,这样在截断边界处的波反射响应中就不会发生波干扰。接下来,我们模拟在弹性半空间中的波传播,并将其与从其他种类的底部边界获得的结果进行比较。接下来,我们在界面中引入位错源,并将获得的模拟AE波响应与在分层介质中计算出的结果进行比较,以证明该模型的性能。在每次仿真中,结果均与参考解决方案吻合良好。

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