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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >ULTRASONIC STUDY OF QUASI-ISOTROPIC COMPOSITES
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ULTRASONIC STUDY OF QUASI-ISOTROPIC COMPOSITES

机译：准各向同性复合材料的超声研究

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摘要

In this paper propagation of ultrasonic waves in arbitrary directions of multilayered quasi-isotropic composites is investigated theoretically and experimentally. Both δ transfer and global matrix methods are used for calculation. It was found that for an arbitrary lamina orientation the global method is more efficient for number of layers below 64. The transfer matrix method is preferable for any number of layers in the plane of symmetry for a 0°/90° composite lay-up. Experiments were performed for a 16-layer quasi-isotropic graphite epoxy composite using both transmission and reflection measurements. Good agreement is observed between theoretical and experiment results. While for static mechanical properties the material is transverse isotropic with isotropy axis perpendicular to the composite surface, the ultrasonic response exhibits monoclinic symmetry at frequency about 2 MHz. Ultrasonic wave transmission decays very fast with increasing deviation of the incident angle from the normal direction. A transmission window is found at angle about 50° at central frequency 2.25MHz. This makes it possible to use obliquely incident waves for composite evaluation. However the ultrasonic behavior is highly frequency dependent and scattering is significant for wave propagation at higher frequencies.
机译：在理论上和实验上研究了多层准各向同性复合材料在任意方向的超声波传播。 δ传递法和全局矩阵法均用于计算。已经发现，对于任意的薄片取向，全局方法对于低于64的层数更为有效。对于0°/ 90°的复合铺层，对于对称平面中的任何数量的层，传递矩阵法都是可取的。使用透射和反射测量对16层准各向同性石墨环氧复合材料进行了实验。理论和实验结果之间观察到很好的一致性。虽然对于静态机械性能，材料是横向各向同性的，各向同性轴垂直于复合材料表面，但是超声响应在大约2 MHz的频率下表现出单斜对称性。随着入射角与法线方向偏差的增加，超声波的传播衰减非常快。发现在中心频率2.25MHz处以大约50°的角度发射的窗口。这使得可以将倾斜入射波用于合成评估。然而，超声行为高度依赖于频率，并且散射对于在较高频率下的波传播很重要。

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