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Monitoring damage in composite plates from crack initiation to macro-crack propagation combining linear and nonlinear ultrasonic techniques
Structural Health Monitoring ( IF 6.6 ) Pub Date : 2020-06-07 , DOI: 10.1177/1475921720922922
Hamad Alnuaimi 1 , Umar Amjad 1 , Pietro Russo 2 , Valentina Lopresto 3 , Tribikram Kundu 1
Affiliation  

In this article, a holistic technique for sensing damage initiation, as well as damage progression in composite plates, is presented combining linear and nonlinear ultrasonic techniques. For this investigation, multiple sets of composite plate specimens made of two different composite materials were fabricated to check if the proposed technique works for different types of specimens. The specimens were damaged by impact loading and then inspected by propagating Lamb waves through them. Different failure mechanisms, such as fiber breaks, matrix cracking, debonding, and delamination, cause composite damage. Two groups of composite specimens that were fabricated and damaged were glass fiber–reinforced polymer composite and basalt fiber–reinforced polymer composite. A chirp signal excited by PZT (lead zirconate titanate) transducer was propagated through undamaged and damaged specimens to investigate the effects of varying degrees of damage on the recorded signals. Both linear and nonlinear ultrasonic parameters were extracted from the recorded signals and analyzed. The change in the linear ultrasonic parameters such as the wave speed and attenuation with damage progression were recorded. A new nonlinear ultrasonic parameter, the sideband peak count or sideband peak count-index, is also introduced and calculated from the recorded signals. It is observed that the nonlinear ultrasonic parameter can monitor the early stage of damage progression better than the linear ultrasonic parameters, while some linear ultrasonic parameters are more effective than the nonlinear ultrasonic parameter for monitoring the advanced stage of damage. Therefore, a combination of linear ultrasonic and nonlinear ultrasonic analyses is ideal for the holistic monitoring of the composite panels from the crack nucleation stage to the structural failure stage.

中文翻译:

结合线性和非线性超声技术监测复合板从裂纹萌生到宏观裂纹扩展的损伤

在本文中,结合线性和非线性超声技术,提出了一种用于感知复合板损伤起始和损伤进展的整体技术。在这项研究中,制作了多组由两种不同复合材料制成的复合板试样,以检查所提出的技术是否适用于不同类型的试样。试样被冲击载荷损坏,然后通过传播兰姆波进行检查。不同的失效机制,如纤维断裂、基体开裂、脱粘和分层,会导致复合材料损坏。制造和损坏的两组复合材料试样是玻璃纤维增​​强聚合物复合材料和玄武岩纤维增强聚合物复合材料。由 PZT(锆钛酸铅)换能器激发的啁啾信号通过未损坏和损坏的样本传播,以研究不同程度的损坏对记录信号的影响。从记录的信号中提取线性和非线性超声参数并进行分析。记录线性超声参数的变化,如波速和衰减随损伤进展。还引入了一个新的非线性超声参数,即边带峰值计数或边带峰值计数指数,并根据记录的信号进行计算。观察到非线性超声参数比线性超声参数可以更好地监测损伤进展的早期阶段,而一些线性超声参数比非线性超声参数更有效地监测损伤的晚期阶段。因此,线性超声和非线性超声分析的结合是复合板从裂纹成核阶段到结构破坏阶段的整体监测的理想选择。
更新日期:2020-06-07
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