本研究應用數值模擬與實驗方式，探討超音波於碳纖維貼片(CFRP)補強材行為，未來可採現地超音波檢測，評估土木結構物之碳纖維貼片補強品質。碳纖維貼片之超音波衰減特性數值分析，使用2-D平面軸對稱有限元素，單層碳纖維貼片之波傳行為模擬(單層模式)，以及表層碳纖維貼片貼附於混凝土基材之波傳行為(雙層模式)，改變碳纖維貼片材料性質：楊氏係數(5.0、8.28、12.0 GPa)、容積密度(1,100、1,600、2,100 kg/m3)、卜松比(0.1、0.23、0.3)以及表層碳纖維貼片厚度(1.5、1.75、2.0 mm)，並搭配超音波實驗比對數值分析結果。
研究結果顯示：單層碳纖維貼片性質與厚度變化下，反射超音波衰減值落於0.54至4.27 dB之間；楊氏係數影響為最大，衰減值變化幅度為0.74 dB至2.51 dB；卜松比影響為最小，衰減值變化幅度為0.11至1.06 dB；厚度增加衰減值亦增加。碳纖維貼片貼附於混凝土基材時，變化表層材料基本性質與厚度，反射超音波衰減值落於7.75至18.25 dB之間，超音波反射比由0.559降低至0.18，反射超音波衰減值由7.75 dB增至18.85 dB；當超音波衰減值高於11.99 dB時，碳纖維貼片層呈現膠合較為良好；反之當超音波衰減值低於11.36 dB時，可界定為碳纖維貼片層為膠合不佳。表層碳纖維貼片貼附於混凝土基材之超音波實驗，碳纖維貼片之反射超音波衰減平均值變化不大，約為15.33 dB至15.87 dB，實驗衰減值高於數值模擬者約33%。

Numerical simulations and experiments are applied to investigate longitudinal ultrasonic behavior in carbon fiber placement (CFRP) as a retrofitting material. In future, field ultrasonic techniques can be used to evaluate the retrofitting quality of CFRP on civil infrastructures. The numerical analysis of ultrasonic attenuation passing through CFRP uses 2-D plane axisymmetric finite element on single-layered CFRP (single-layered model) and CFRP covering on concrete as a substrate (double-layered model). The effects of Young's moduli (5.0, 8.28, and 12.0 GPa), bulk densities (1,100, 1,600, and 2,100 kg/m3), Poisson’s ratios (0.1, 0.23, and 0.3), and thicknesses (1.5, 1.75, and 2.0 mm) of CFRP are numerically discussed in detail. The ultrasonic experiments on CFRP covering on concrete are executed to identify the numerical results.
Research results are summarized as the following: On single-layered CFRP, reflected attenuation loss values range from 0.54 dB to 4.27 dB for various material properties and thicknesses. A wider attenuation loss variation from 0.74 dB to 2.51 dB is affected by Young’s modulus; instead, a smaller attenuation loss variation from 0.11 dB to 1.06 dB is affected by Poisson’s ratio. On CFRP covering on concrete, reflected attenuation loss values vary from 7.75 dB to 18.85 dB, corresponding reflectivity values from 0.559 to 0.18 for various material properties and thicknesses. When the attenuation loss value is higher than 11.99 dB, the carbon fiber patch glue layer could function relatively well. In contrast, when the attenuation loss value is lower than 11.36 dB, the carbon fiber layer is identified as poor lamination. On ultrasonic experiments in double-layered model, the attenuation loss values of CFRP reveal a low variation from 15.33 dB to 15.87 dB. The experimental attenuation loss values are 33% higher than those from the numerical simulation.

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