Impact Localization Monitoring of the CFRP Composite Plate Based on Low-sampling Rate FBF Sensors by SVM

2015 ◽  
Author(s):  
ZHUO PANG ◽  
MEI YUAN ◽  
HAO SONG ◽  
WENJUAN WANG
Keyword(s):  
Composite Plate ◽  
Sampling Rate ◽  
Cfrp Composite ◽  
Impact Localization

Composite plate low energy impact localization system based on FBG sensing network and hybrid algorithm

2015 ◽  
Vol 24 ◽  
pp. 84-88 ◽  
Author(s):  
Yaozhang Sai ◽  
Mingshun Jiang ◽  
Qingmei Sui ◽  
Shizeng Lu ◽  
Lei Jia
Keyword(s):  
Hybrid Algorithm ◽  
Composite Plate ◽  
Low Energy ◽  
Localization System ◽  
Energy Impact ◽  
Impact Localization

Impact Localization on a Composite Plate With Unknown Material Properties Using PWAS Transducers and Wavelet Transform

2017 ◽  
Author(s):  
Asaad Migot ◽  
Victor Giurgiutiu
Keyword(s):  
Wavelet Transform ◽  
Nonlinear Equations ◽  
Material Properties ◽  
Composite Plate ◽  
Linear Equations ◽  
Active Sensors ◽  
Piezoelectric Wafer Active Sensors ◽  
Piezoelectric Wafer ◽  
The Impact ◽  
Impact Localization

In this work, an impact experiment on a composite plate with unknown material properties (its group velocity profile is unknown) is implemented to localize the impact points. A pencil lead break is used to generate acoustic emission (AE) signals which are acquired by six piezoelectric wafer active sensors (PWAS). These sensors are distributed with a particular configuration in two clusters on the plate. The time of flight (TOF) of acquired signals is estimated at the starting points of these signals. The continuous wavelet transform (CWT) of received signals are calculated with AGU Vallen wavelet program to get the accurate values of the TOF of these signals. Two methods are used for determining the coordinates of impact points (localization the impact point). The first method is the new technique (method 1) by Kundu. This technique has two linear equations with two unknowns (the coordinate of AE source point). The second method is the nonlinear algorithm (method 2). This algorithm has a set of six nonlinear equations with five unknowns. Two MATLAB codes are implemented separately to solve the linear and nonlinear equations. The results show good indications for the location of impact points in both methods. The location errors of calculated impact points are divided by constant distance to get independent percentage errors with the site of the coordinate.

scholarly journals Experimental and Theoretical Investigations of the Impact Localization of a Passive Smart Composite Plate Fabricated Using Piezoelectric Materials

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
M. M. S. Dezfouli ◽  
Mohd Roshdi Hassan ◽  
Mohd Hafidz Ruslan ◽  
Sohif Mat ◽  
B. Bakhtyar
Keyword(s):  
Composite Plate ◽  
Piezoelectric Materials ◽  
Low Cost ◽  
Composite Plates ◽  
Smart Composite ◽  
Impact Location ◽  
Theoretical Investigations ◽  
Cartesian Coordinate ◽  
The Impact ◽  
Impact Localization

Two passive smart composite plates are fabricated using one and two PZT patches that are cheaper than the PZT wafer. The composite plate is fabricated in low temperature through the hand lay-up method to avoid PZT patch decoupling and wire spoiling. The locus of the impact point is identified using the output voltage to identify the impact location using one sensor. The output voltages of the sensors are analyzed to identify the impact location using two sensors. The locations of the impacts are determined based on the crossing points of two circles and the origin of an intended Cartesian coordinate system that is concentric with one of the sensors. This study proposes the impact location identification of the passive smart composite using the low-cost PZT patch PIC155 instead of common embedded materials (wafer and element piezoelectric).

Mechanical Property of CFRP by Carbon Spray Up Method

2013 ◽  
Author(s):  
Tetsuo Kikuchi ◽  
Akira Fudauchi ◽  
Tetsushi Koshino ◽  
Chieko Narita ◽  
Atsushi Endo ◽  
...  
Keyword(s):  
Motion Analysis ◽  
New Technology ◽  
Sampling Rate ◽  
Testing Machine ◽  
Human Motion ◽  
Molding Method ◽  
Composite Molding ◽  
The Matrix ◽  
Cfrp Composite ◽  
The Difference

Spray up method is one of methods for composite molding and it is traditional and common molding method that can deal with various shapes according to workmen skill. The essence of the composite molding impregnates resin to fiber;, in other words, is to substitute air included in the fiber for resin. Spray up method can spray matrix on mold together while cutting reinforcements continually, and the cutting of the reinforcement, setting up and the impregnation of the matrix are carried out at the same time. That is why working process is made efficiency and can cope with a design change easily. However, the quality of the composites depends on the techniques of workmen and the judgment with Spray up technique is too difficult, because it has not clarified that the difference of that techniques has how influence with manufactured products. In addition, in a spray up method, glass reinforcements is usually used, but carbon reinforcements is not put to practical use. High quality is required with the CFRP composite, and this is because it is thought that techniques of Spray up method does not satisfy this demand. In this study, motion analysis was used to compare the difference between Spray up techniques by expert and non-expert. Expert’s carrier of Spray up was 19 years and non-expert’s carrier was a year. Motion analysis, which is applied to various fields like sports or traditional crafts and so on, can visualize human motion. The Mac 3D System was used as equipment, since it is the most powerful tool for the motion capture and analysis particularly. The sampling rate was 60 Hz. The object of this study was to contribute that technique back to fabrication fields by analyzing and considering what was important factor. Furthermore, this trial is thought that leads to the development of new technology. As the result, the motion of expert’s lower half of body indicated different motion compared with non-expert one. Expert’s centroid moved smoothly and his motion showed constant tendency. On the other hand, non-expert’s motion was awkward in several points and his motion didn’t show the tendency like expert. Furthermore, The CFRP structures that manufactured with Spray up method are cut for the tensile testing. Tensile test were performed by using an Instron universal testing machine under a speed 1mm/min. Spray up technique is discussed based on the motion analysis method and moreover it is shown that Spray up method is useful in CFRP materials production.

Processing Methodology to Embedding NiTi Shape Memory Fibers into a Polymer-Based Composite Plate

2010 ◽  
Vol 643 ◽  
pp. 1-5
Author(s):  
Boniek Evangelista Leite ◽  
Rafael Feliciano De Macedo ◽  
Wanderley Ferreira Amorim Júnior ◽  
Carlos José de Araújo
Keyword(s):  
Young’S Modulus ◽  
Composite Plate ◽  
Hybrid Composites ◽  
Young's Modulus ◽  
Plate Thickness ◽  
Testing Machine ◽  
Materials Testing ◽  
Fiber Alignment ◽  
Cfrp Composite ◽  
Shape Memory Fibers

The objective of this work was the development of a processing methodology for embedding NiTi fibers into a polymer-based composite plate. A carbon fiber reinforced polymer (CFRP) prepreg and NiTi thin wires were used. A uniaxial hot press was prepared to be used in the composite processing. Two prototypes were fabricated to provide fiber alignment and fixation fixture. A CFRP composite plate without fiber and another with NiTi fibers were processed. Micrometers and a universal materials testing machine were used to measure the plate thickness and Young's modulus. It was possible to develop a processing methodology for embedding NiTi fibers into a polymer-based composite plate. The CFRP plate without fiber presented almost no variation in plate thickness and Young's modulus measurement thus enabling the CFRP manufacture by the hot uniaxial press. The fiber fixation fixture developed was able to produce CFRP-NiTi fiber hybrid composites with different number of fibers embedded, the spacing distance between fibers was at least 1 mm and the fiber alignment was achieved.

scholarly journals Experimental Investigation of Impact Localization in Composite Plate Using Newly Developed Imaging Method

2018 ◽  
Author(s):  
Mohammad Faisal Haider ◽  
Asaad Migot ◽  
Md Yeasin Bhuiyan ◽  
Victor Giurgiutiu
Keyword(s):  
Composite Plate ◽  
High Energy ◽  
Temperature Cycle ◽  
Imaging Method ◽  
Impact Event ◽  
Scanning Method ◽  
Time Frequency ◽  
Energy Impact ◽  
The Impact ◽  
Impact Localization

This paper focused on impact localization of composite structures, which possess more complexity in the guided wave propagation because of the anisotropic behavior of composite materials. In this work, a composite plate was manufactured by using a compression molding process with proper pressure and temperature cycle. Eight layers of woven composite prepreg were used to manufacture the composite plate. A structural health monitoring (SHM) technique is implemented with piezoelectric wafer active sensors (PWAS) to detect and localize the impact on the plate. There are two types of impact event are considered in this paper (a) low energy impact event (b) high energy impact event. Two clusters of sensors recorded the guided acoustic waves generated from the impact. The acoustic signals are then analyzed using a wavelet transform based time-frequency analysis. The proposed SHM technique successfully detect and localize the impact event on the plate. The experimentally measured impact locations are compared with the actual impact locations. An immersion ultrasonic scanning method was used to visualize the composite plate before and after the impact event. A high frequency 10 MHz 1-inch focused transducer was used to scan the plate in the immersion tank. Scanning results show that there is no visible manufacturing damage in the composite plate. However, clear impact damage was observed after the high-energy impact event.

scholarly journals Multimode Guided Wave Detection for Various Composite Damage Types

2020 ◽  
Vol 10 (2) ◽  
pp. 484 ◽  
Author(s):  
Hanfei Mei ◽  
Robin James ◽  
Mohammad Faisal Haider ◽  
Victor Giurgiutiu
Keyword(s):  
Composite Plate ◽  
Guided Waves ◽  
Impact Damage ◽  
Guided Wave ◽  
Wave Detection ◽  
Composite Damage ◽  
Cfrp Composite ◽  
The Impact ◽  
Damage Types ◽  
Wave Modes

This paper presents a new methodology for detecting various types of composite damage, such as delamination and impact damage, through the application of multimode guided waves. The basic idea is that various wave modes have different interactions with various types of composite damage. Using this method, selective excitations of pure-mode guided waves were achieved using adjustable angle beam transducers (ABTs). The tuning angles of various wave modes were calculated using Snell’s law applied to the theoretical dispersion curves of composite plates. Pitch–catch experiments were conducted on a 2-mm quasi-isotropic carbon fiber-reinforced polymer (CFRP) composite plate to validate the excitations of pure fundamental symmetric mode (S0) and shear horizontal mode (SH0). The generated pure S0 mode and SH0 mode were used to detect and separate the simulated delamination and actual impact damage. It was observed that S0 mode was only sensitive to the impact damage, while SH0 mode was sensitive to both simulated delamination and impact damage. The use of pure S0 and SH0 modes allowed for damage separation. In addition, the proposed method was applied to a 3-mm-thick quasi-isotropic CFRP composite plate using multimode guided wave detection to distinguish between delamination and impact damage. The experimental results demonstrated that the proposed method has a good capability to detect and separate various damage types in composite structures.

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