Research on Knocking Characteristics of Composite Materials of Laminate Plate and Sandwich Structures
Two types of composite materials damage specimens with different structures,that was laminated plate and honeycomb sandwich,were prepared.Based on finite element theory,the vibration characteristics of these two typical com-posite damage structures were analyzed.It was found that the damage size had a significant impact on the natural frequencies of carbon fiber honeycomb materials compared to that of carbon fiber laminates.The two different structures of composite damage specimens were tested by using the woodpecker intelligent testing instrument.The experimental results showed that the damage discrimination rate of the honeycomb sandwich structure damage specimen was 50.5％,while the damage dis-crimination rate of the laminated plate damage specimen was 31.5％.The damage detection sensitivity of carbon fiber hon-eycomb composite materials was significantly higher than that of laminated plate structure composite materials by using knock detection.
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