scholarly journals Ultrasonic wave transmission and bandgap in multidirectional composite laminates with spring-type interlayer interfaces

2017 ◽  
Vol 141 (2) ◽  
pp. 1099-1110 ◽  
Author(s):  
Yosuke Ishii ◽  
Shiro Biwa
Keyword(s):  
Ultrasonic Wave ◽  
Composite Laminates ◽  
Wave Transmission ◽  
Spring Type

Weld Quality Prediction in Ultrasonic Welding of Carbon Fiber Composite Based on an Ultrasonic Wave Transmission Model

2019 ◽  
Vol 141 (8) ◽  
Author(s):  
Yang Li ◽  
Zhiwei Liu ◽  
Junqi Shen ◽  
Tae Hwa Lee ◽  
Mihaela Banu ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Ultrasonic Wave ◽  
Composite Structures ◽  
Fiber Composite ◽  
Ultrasonic Welding ◽  
Wave Transmission ◽  
Transmission Model ◽  
Quality Prediction ◽  
Weld Quality ◽  
Carbon Fiber Composite

Ultrasonic welding has been widely used in joining plastic parts since it is fast, economical, and suitable for automation. It also has great potential for joining thermoplastic composite structures in the aerospace and automotive industries. For a successful industrial application of ultrasonic composite welding, it is necessary to have effective weld quality prediction technology. This paper proposes a model for weld quality prediction by establishing a correlation between ultrasonic wave transmission and welding process signatures. The signatures, welding power, and force are directly related to the weld quality. This model is used to predict the weld quality with three contact conditions and validated by experiments. The results show that the quality model performs well when a centralized and consistent contact condition is achieved. The model provides a process physics-based solution for the online weld quality prediction in ultrasonic welding of carbon fiber composite.

scholarly journals Detection Technology of Foamed Mixture Lightweight Soil Embankment Based on Ultrasonic Wave Transmission Method

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Shikun Pu ◽  
Baoning Hong ◽  
Xin Liu ◽  
Fenqiang Xu ◽  
Hao Shan
Keyword(s):  
Ultrasonic Wave ◽  
Detection Method ◽  
Wave Transmission ◽  
Simulation Approach ◽  
Transmission Method ◽  
Detection Technology ◽  
Ultrasonic Parameters ◽  
Test Distance ◽  
Quality Diagnosis ◽  
Curing Age

This study attempted to establish a process that uses the ultrasonic wave transmission method to correlate the ultrasonic parameters with the material properties of Foamed Mixture Lightweight Soil (FMLS). The results were then applied for the defect detection of the FMLS embankment. First, the ultrasonic wave velocity (UPV) and amplitude (UPA) of FMLS with different mix proportions were collected continuously from 3rd day to 45th day in the curing age. The relationships between UPV versus FMLS elastic modulus, unconfined compressive strength, and density were calibrated. The variations in the ultrasonic parameters owing to the test distance and crack width were recorded. Then, the laboratory tests were reproduced through numerical simulation approach. Finally, the reliability and accuracy of the proposed detection method for FMLS were proved and validated through on-site tests. The proposed methodology, which is simple, stable, and reliable, was found to be suitable for the quality diagnosis of FMLS embankments after construction and during operation.

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