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首页> 外文期刊>Journal of Nondestructive Evaluation >Finite element and plate theory modeling of acoustic emission waveforms
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Finite element and plate theory modeling of acoustic emission waveforms

机译：声发射波形的有限元和板理论建模

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A comparison was made between two approaches topredict acoustic emission waveforms in thin plates. A normalmode solution method for Mindlin plate theory was used to predictthe response of the flexural plate mode to a point source, step-function load, applied on the plate surface. The second approachused a dynamic finite element method to model the problem usingequations of motion based on exact linear elasticity. Calculationswere made using properties for both isotropic (aluminum) andanisotropic (unidirectional graphite/epoxy composite) materials.For simulations of anisotropic plates, propagation along multipledirections was evaluated. In general, agreement between the twotheoretical approaches was good. Discrepancies in the waveformsat longer times were caused by differences in reflections from thelateral plate boundaries. These differences resulted from the factthat the two methods used different boundary conditions. Atshorter times in the signals, before reflections, the slightdiscrepancies in the waveforms were attributed to limitations ofMindlin plate theory, which is an approximate plate theory. Theadvantages of the finite element method are that it used the exactlinear elasticity solutions, and that it can be used to model realsource conditions and complicated, finite specimen geometries aswell as thick plates. These advantages come at a cost of increasedcomputational difficulty, requiring lengthy calculations on work-stations or supercomputers. The Mindlin plate theory solutions,meanwhile, can be quickly generated on personal computers.Specimens with finite geometry can also be modeled. Howeve,only limited simple geometries such as circular or rectangularplates can easily be accommodated with the normal mode solutiontechnique. Likewise, very limited source configurations can bemodeled and plate theory is applicable only to thin plates.
机译：在两种方法之间进行了比较，主张薄板中的声学发射波形。用于态度板理论的普通模型解决方法用于预测弯曲板模式到施加在板表面上的点源的倾斜级载荷的响应。第二接近动态有限元方法来模拟基于精确线性弹性的运动的问题。使用各向同性（铝）和喃类（单向石墨/环氧复合材料）材料的性质进行计算。对于各向异性板的仿真，评估沿多向一体化的繁殖。一般而言，拟象论方法之间的协议很好。波形阶层的差异较长时间是由从头板边界的反射差异引起的。这些差异是由于两种方法使用不同的边界条件。在信号中的ATSHORTER时间，在反射之前，波形中的略微程度归因于MINDLIN板理论的限制，这是一个近似的板理论。有限元方法的TheDvantages是它使用了精确的弹性解决方案，并且它可用于模拟Realsource条件和复杂的有限标本几何形状，作为厚板。这些优点以增加计算困难，需要对工作站或超级计算机进行冗长的计算。同时，Mindlin Plate理论解决方案可以在个人计算机上快速生成。也可以建模具有有限几何形状的特性。 Howeve，只有有限的简单几何形状，如圆形或矩形板，可以通过正常模式解决方案容纳。同样地，非常有限的源配置可以抽出，并且板理论仅适用于薄板。

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