Acoustic Emission Monitoring of Thin Ply Hybrid Composites under Repeated Quasi-Static Tensile Loading
Acoustic Emission Monitoring of Thin Ply Hybrid Composites under Repeated Quasi-Static Tensile Loading
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DOI：
10.5937/fmet1802238f
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发表时间：
2018-01-01
期刊：
影响因子：
1.6
通讯作者：
Wisnom, Michael R.
中科院分区：
文献类型：
--
作者：
Fotouhi, Mohamad;Suwarta, Putu;Wisnom, Michael R.
本文研究了声发射 (AE) 技术在重复准静态拉伸载荷下识别 S-Glass/TR30-Carbon 混合层压板损伤发生和累积的适用性。样品由 2 层单向薄碳预浸料层制成，夹在 2 个标准厚度的 S 玻璃预浸料层之间。 AE 结果分析表明，关于 AE 信号的能量和幅度范围，存在两种类型的事件。发现具有低值的信号与碳/玻璃界面的分层有关，而具有高值的信号与碳层碎裂相关。由于现有裂纹面之间的碰撞和摩擦，卸载阶段比加载阶段有更多与摩擦相关的 AE 信号。增加应变水平会增加碎片数量，AE 技术能够对此进行量化。结论是，AE 技术可用于评估碎片数量，并可识别混合层合板在重复准静态拉伸载荷下的损伤演变。
This paper investigates the applicability of the acoustic emission (AE) technique for identification of the damage onset and accumulation in S-Glass/TR30-Carbon hybrid laminates under repeated quasi-static tensile loading. The samples were made of 2 layers of unidirectional thin carbon prepreg plies which were sandwiched between 2 standard thickness S-glass prepreg plies. Analysis of the AE results shows that there are two types of events regarding energy and amplitude ranges of the AE signals. The signals with low values are found to be related to the delamination of the carbon/glass interface whereas the signals with high values are linked with the carbon layer fragmentation. There are more friction related AE signals during the unloading stage than the loading stage due to collision and rubbing between existing crack faces. Increasing the strain level increases the number of fragmentations and the AE technique is able to quantify this. It is concluded that the AE technique can be used to evaluate the number of fragmentations and can identify the damage evolution of the hybrid laminate under repeated quasi-static tensile loading.