Parametric Analysis of Acoustic Emission Signals for Evaluating Damage in Composites Using a PVDF Film Sensor

Bar, H. N.; Bhat, M.R.; Murthy, C. Siva Ram

doi:10.1007/s10921-005-8780-z

Cited by 32 publications

(25 citation statements)

References 15 publications

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“…Figure 3 shows the flow diagram of the experiment. 14 The device was used to assess the surface roughness of 3 different objects: an office desktop, printing paper, and a cardboard box. 15 Before the experiment commenced, the device recorded a set of empty data in order to check whether environment noise would affect the experimental data.…”

Section: Experimental Studymentioning

confidence: 99%

Friction properties of biological functional materials: PVDF membranes

Chen

et al. 2016

Bioengineered

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Touch is produced by sensations that include approaching, sliding, pressing, and temperature. This concept has become a target of research in biotechnology, especially in the field of bionic biology. This study measured sliding and pressing with traditional tactile sensors in order to improve a machine operator's judgment of surface roughness. Based on the theory of acoustic emission, this study combined polyvinylidene fluoride (PVDF) with a sonic transducer to produce tactile sensors that can detect surface roughness. Friction between PVDF films and experimental materials generated tiny acoustic signals that were transferred into electrical signals through a sonic transducer. The characteristics of the acoustic signals for the various materials were then analyzed. The results suggest that this device can effectively distinguish among different objects based on roughness. Tactile sensors designed using this principle and structure function very similarly to the human body in recognizing the surface of an object.

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Section: Experimental Studymentioning

confidence: 99%

Friction properties of biological functional materials: PVDF membranes

Chen

et al. 2016

Bioengineered

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“…Other advantages and applications of PZT sensors and actuators are high piezoelectric coupling factors, moderate permittivity, high Q-factors and very good stability under high mechanical loads and operating fields [30]. More detailed information about PZT and PFDV and their applications in damage detection can be found in papers [6,8,12,17,18,40].…”

Section: Common Smh Sensors and Actuatorsmentioning

confidence: 99%

“…In contrast to other NDT techniques, in the AE the energy released by the damage and deals only with dynamic processes or changes (e. g. crack growth) in a material is sensed and analyzed. Furthermore, the different failure mechanisms have different characteristics which can be studied utilizing the AE parametric data [6]. Using AE it is possible to discern between developing and stagnant defects, but in some cases the external loading can be not high enough to cause an acoustic wave [33].…”

Section: Guided Waves Propagationmentioning

confidence: 99%

Structural Health Monitoring (SHM) Methods in Machine Design and Operation

Barski¹,

Kędziora²,

Muc³

et al. 2014

Archive of Mechanical Engineering

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The present paper is devoted to the discussion and review of the non-destructive testing methods mainly based on vibration and wave propagation. In the first part, the experimental methods of actuating and analyzing the signal (vibration) are discussed.The piezoelectric elements, fiber optic sensors and Laser Scanning Doppler Vibrometer (SLDV) method are described. Effective detecting of the flaws needs very accurate theoretical models. Thus, the numerical methods, e.g. finite element, spectral element method and numerical models of the flaws in isotropic and composite materials are presented. Moreover, the detection of the damage in structures, which are subjected to cyclic or static loads, is based on the analyzing of the change in natural frequency of the whole structure, the change of internal impedance of the material and the change in guided waves propagating through the investigated structure. All these cases are characterized in detail. At the end of this paper, several applications of the structural health monitoring systems in machine design and operation are presented.

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“…Many researchers have attempted to identify the failure modes using parametric based approach and signal based approach [16]. For parametric based approach, most of the studies have been performed through AE parameters such as energy, counts, amplitude, duration and rise time [17,18] while AE waveforms and its FFT are used in Signal based approach [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrolytic Ageing on Kevlar/Polyester Using Acoustic Emission Monitoring

et al. 2012

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When composite materials are exposed to seawater it undergoes various processes of degradation such as matrix cracking, fiber breakage, delamination and interfacial debonding, resulting in the reduction in load carrying capacity. To improve the strength characteristics, Kevlar fibers are used in Marine applications. But Kevlar is prone to lot of moisture absorption and its adhesiveness towards the resin is also very much less. When exposed to seawater, the most noticeable effect is the plasticization of the matrix. This research attempts to investigate the reduction in flexural strength of ASTM D790 Kevlar/polyester specimens by 3 point bending test with AE monitoring using an INSTRON 3367 UTM, which are conditioned in seawater at non-laboratory conditions following ASTM-D5229 standard over different time intervals. The change in magnitude of AE parameters are correlated with the mechanical strength of Kevlar/polyester samples. Since Kevlar offers little resistance to Delamination, the focus of the study is being restricted to the failure modes such as debonding and Delamination.The range of Peak frequencies for various hydrolytically aged states for Kevlar samples are investigated using FFT analysis. Hits chosen randomly from each range of peak frequencies pertaining to each failure mode for various hydrolytically aged specimens are investigated using STFFT analysis.

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Parametric Analysis of Acoustic Emission Signals for Evaluating Damage in Composites Using a PVDF Film Sensor

Cited by 32 publications

References 15 publications

Friction properties of biological functional materials: PVDF membranes

Friction properties of biological functional materials: PVDF membranes

Structural Health Monitoring (SHM) Methods in Machine Design and Operation

Effect of Hydrolytic Ageing on Kevlar/Polyester Using Acoustic Emission Monitoring

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