scholarly journals A Lamb Wave Wavenumber-Searching Method for a Linear PZT Sensor Array

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4166 ◽  
Author(s):  
Bin Liu ◽  
Tingzhang Liu ◽  
Jianfei Zhao
Keyword(s):  
Time Domain ◽  
Lamb Wave ◽  
Sensor Array ◽  
Fiber Composite ◽  
Sampling Rate ◽  
Laminate Plate ◽  
Spatial Sampling ◽  
Damage Localization ◽  
Carbon Fiber Composite ◽  
Searching Method

In this paper, a wavenumber–searching method based on time-domain compensation is proposed to obtain the wavenumber of the Lamb wave array received signal. In the proposed method, the time-domain sampling signal of the linear piezoelectric transducer (PZT) sensor array is converted into a spatial sampling signal using the searching wavenumber. The two–dimensional time-spatial-domain Lamb wave received signal of the linear PZT sensor array is then converted into a one-dimensional synthesized spatial sampling signal. Further, the sum of squared errors between the synthesized spatial sampling signal and its Morlet wavelet fitting signal is calculated at each searching wavenumber. Finally, the wavenumber of the Lamb wave array received signal is obtained as the searching wavenumber corresponding to the minimum error. This method was validated on a 2024-T3 aluminum alloy. The validation results showed that the proposed method can successfully obtain the wavenumber of the Lamb wave array received signal, whose spatial sampling rate does not satisfy the Nyquist sampling theorem; the wavenumber error does not exceed 2.2 rad/m. Damage localization based on the proposed method was also validated on a carbon fiber composite laminate plate, and the maximum damage localization error was no more than 2.11 cm.

scholarly journals Frequency Aliasing-Based Spatial-Wavenumber Filter for Online Damage Monitoring

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Bin Liu ◽  
Tingzhang Liu ◽  
Jianfei Zhao ◽  
Dan Hang
Keyword(s):  
Lamb Wave ◽  
Sensor Array ◽  
Laminate Plate ◽  
Sampling Theorem ◽  
Spatial Sampling ◽  
Filter Method ◽  
Damage Monitoring ◽  
Shannon Sampling Theorem ◽  
Damage Imaging ◽  
Frequency Aliasing

The spatial-wavenumber filter method can extract the specific mode of the Lamb wave, thereby distinguishing the incident wave and the damage reflection wave. This method has been widely studied for damage imaging. However, the diameter of piezoelectric transducer (PZT) sensor limits the spatial sampling wavenumber of the linear PZT sensor array, which limits the application of this method because of the Nyquist–Shannon sampling theorem. Therefore, the wavenumber filtering range of spatial-wavenumber filter should be less than half of the spatial sampling wavenumber. In this paper, a frequency aliasing based spatial-wavenumber filter for online damage monitoring is proposed. In this method, the wavenumber filtering range is extended to the spatial sampling wavenumber, and two wavenumber results will be calculated as for the frequency aliasing. Subsequently, the wavenumber of the received Lamb wave signal can be obtained according to the average arrival time difference between the two adjacent sensors in the linear PZT sensor array. Finally, the damage is localized using the spatial-wavenumber filter and cruciform PZT sensor array. This method was validated on an epoxy laminate plate. The maximum damage localization errors are less than 2 cm. It is indicated that this method can extend the spatial-wavenumber filtering range to the spatial sampling wavenumber and the application of spatial-wavenumber filter-based online damage monitoring.

Graphene-Based Strain Sensor Array on Carbon Fiber Composite Laminate

2015 ◽  
Vol 15 (12) ◽  
pp. 7295-7303 ◽  
Author(s):  
Andrea Rinaldi ◽  
Alessandro Proietti ◽  
Alessio Tamburrano ◽  
Monica Ciminello ◽  
Maria Sabrina Sarto
Keyword(s):  
Carbon Fiber ◽  
Composite Laminate ◽  
Sensor Array ◽  
Fiber Composite ◽  
Strain Sensor ◽  
Carbon Fiber Composite ◽  
Strain Sensor Array

Finite Element Analysis and Experimental Investigation of Carbon Fiber Composite Circular Tube

2011 ◽  
Vol 194-196 ◽  
pp. 1776-1780
Author(s):  
Lei Fu ◽  
Guo Quan Tao ◽  
Yu Ni Huang ◽  
Zhe Wu
Keyword(s):  
Carbon Fiber ◽  
Circular Tube ◽  
Fiber Composite ◽  
Fem Simulation ◽  
Laminate Plate ◽  
Outer Diameter ◽  
Carbon Fiber Composite ◽  
Element Analysis ◽  
Mechanics Of Materials ◽  
Bending Load

In this paper, A 3-D numerical model of a circular tube is established, which is made of carbon fiber composite materials whose inner diameter is 43mm and outer diameter is 45mm. The behaviour of axial compression and bending load cases are analyzed under the theory of mechanics of materials and theory of classical laminate plate. Results of axial compressive stiffness and bending stiffness agree well with the experimental data,showing that the FEM simulation used in this paper is an efficient and reliable tool to calculate and predict the behaviour of carbon fiber tube.

FIRE DAMAGE ON CARBON FIBER MATERIALS CHARACTERIZED BY THZ WAVES

2007 ◽  
Vol 17 (02) ◽  
pp. 213-224 ◽  
Author(s):  
NICHOLAS KARPOWICZ ◽  
DAVID DAWES ◽  
MARK J. PERRY ◽  
X. -C. ZHANG
Keyword(s):  
Carbon Fiber ◽  
Time Domain ◽  
Fiber Composite ◽  
Fire Damage ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Carbon Fiber Composite ◽  
Damage Level ◽  
Fiber Materials ◽  
Non Destructive

We apply THz imaging technology to evaluate fire damage to a variety of carbon fiber composite samples. The majority of carbon fiber materials have polarization-dependent reflectivities in the THz frequency range, and we show how the polarization dependence changes versus the burn damage level. Additionally, time domain information acquired through a THz time-domain spectroscopy (TDS) system provides further information with which to characterize the damage. The technology is discussed in terms of non-destructive testing applications to the defense and aerospace industries.

Detecting Changes in Fiber Orientation in a Simulated Chopped Fiber Plate Using Curvature Mode Shapes

2018 ◽  
Vol 85 (5) ◽  
Author(s):  
Janette J. Meyer ◽  
Douglas E. Adams
Keyword(s):  
Carbon Fiber ◽  
Material Properties ◽  
Fiber Composite ◽  
Laminate Plate ◽  
Element Model ◽  
Production Costs ◽  
Mode Shapes ◽  
Carbon Fiber Composite ◽  
Shear Alignment ◽  
Carbon Fiber Laminate

The use of chopped fibers in the manufacturing of carbon fiber composite parts is becoming more popular in order to reduce production costs, especially in the automotive, wind, and gas storage industries. The orientation of the fibers in a chopped fiber part is important because the material properties of the part depend upon it. Phenomena such as shear alignment can result in undesired material properties, and therefore, a method for detecting the presence of undesired fiber orientations is needed. In this paper, a metric based on a part's curvature mode shapes is developed to identify the presence and location of fibers whose orientation is different from that of a desired alignment. A proof-of-concept experimental analysis shows the effectiveness of the metric at locating a region in a carbon fiber laminate plate that has been modified by rotating the fibers 90 deg. A finite element model is also developed to validate the experimental results and explore other modification scenarios. In each case, the metric is effective in identifying areas in which fiber alignment changed relative to a baseline model. In one case, a change as small as 3 deg was identified.

Prestressed Carbon Fiber Composite Overwrapped Gun Tube

2008 ◽  
Author(s):  
Andrew Littlefield ◽  
Edward Hyland ◽  
Jack Keating
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Carbon Fiber Composite
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