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Evaluation of barely visible indentation damage (BVID) in CF/EP sandwich composites using guided wave signals

机译:使用导波信号评估CF / EP夹芯复合材料中几乎看不见的压痕损伤(BVID)

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摘要

Barely visible indentation damage after quasi-static indentation in sandwich CF/EP composites was assessed using ultrasonic guided wave signals. Finite element analyses were conducted to investigate the interaction between guided waves and damage, further to assist in the selection process of the Lamb wave sensitive modes for debonding identification. Composite sandwich beams and panels structures were investigated. Using the beam structure, a damage index was defined based on the change in the peak magnitude of the captured wave signals before and after the indentation, and the damage index was correlated with the residual deformation (defined as the depth of the dent), that was further correlated with the amount of crushing within the core. Both A_0 and S_0 Lamb wave modes showed high sensitivity to the presence of barely visible indentation damage with residual deformation of 0.2 mm. Furthermore, barely visible indentation damage was assessed in composite sandwich panels after indenting to 3 and 5 mm, and the damage index was defined, based on (a) the peak magnitude of the wave signals before and after indentation or (b) the mismatch between the original and reconstructed wave signals based on a time-reversal algorithm, and was subsequently applied to locate the position of indentation.
机译:使用超声波导波信号评估了CF / EP夹芯复合材料准静态压痕后的几乎可见的压痕损坏。进行了有限元分析,以研究导波与损伤之间的相互作用,进一步协助对Lamb波敏感模式的选择过程进行脱胶鉴定。研究了复合夹层梁和面板结构。使用梁结构,基于压痕前后捕获的波信号的峰值幅度的变化来定义损伤指数,并将损伤指数与残余变形(定义为凹痕的深度)相关,从而与岩心内部的破碎量进一步相关。 A_0和S_0兰姆波模式均显示出对几乎看不见的压痕损伤的高灵敏度,残余变形为0.2 mm。此外,在压入3和5 mm后,在复合夹心板中评估了几乎看不见的压痕损伤,并基于(a)压痕前后的波信号峰值幅度或(b)压痕之间的失配来定义损伤指数原始和重构的波信号基于时间反转算法,随后被用于定位压痕的位置。

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