Acoustic Emission During Tensile Testing of Composite Materials

Abstract

This paper deals with possibilities of acoustic emission method utilization as an online surveillance tool for improvement of identification of structural damage onset in composite materials. With employment of AE method we are able to localize the degraded areas in stressed components and subsequently estimate the extent of degradation. In experimental part the piezoelectric sensor was employed for continuous record of emission signals, continuous processing and analysis of measured data and monitoring of stressed material feedback on applied mechanical load in real time. Partial results from distinctive areas of conducted research were implemented in this method, especially detection of emission signals and analysis of recorded signals in both frequency and temporal zones. Samples were reinforcement of 6 layers aramide-carbon weave 0/90° of specific mass 180 g/m2.In total 7 samples were tested in monoaxial tension on universal testing apparatus ZDM 5/51 with acoustic emission measurement recording in course of testing.

Enhanced mechanical, tribological, and acoustical behavior of polyphenylene sulfide composites reinforced with zero‐dimensional alumina

“…The AE energy signal-time curve explains that there was a significant and rapid increase in signal due to onset of continuous matrix destruction or the formation of microfissures in the PPS matrix during the initial phase of measurement. 51 This is related to the local disturbances of plastic deformation. When load is intensified, Al 2 O 3 fillers in the composite started deforming and high levels of shear stress is exerted at their interface.…”

“…The first significant damage in all the specimens can be identified by the jump in the AE absolute energy rate curve as marked as (ii) in Figure 10b. The AE energy signal‐time curve explains that there was a significant and rapid increase in signal due to onset of continuous matrix destruction or the formation of microfissures in the PPS matrix during the initial phase of measurement 51 . This is related to the local disturbances of plastic deformation.…”

Evaluation of DLC Coating for Parts of Weapons and Military Equipment

“…This generates a stress at the interface which, when the critical value is reached, causes the coating to tear off from the substrate. The tribometer recorded the course of the normal FN and the tangential force Ft acting on the indentor, the friction coefficient values and the acoustic emission signal [16].…”

Acousto-ultrasonic analysis of defects in composite specimens used in transportation domain

“…Structures made of composite material require their health assessed as well, since they are prone to defects, such as delamination, matrix crack, fiber-matrix debonding and fiber breakage [18]. The advantages of AE monitoring are more than enough and they are evident in the relevant literature [19][20][21][22][23][24]. Certain advantages of the AE methodology includes, real-time assessment with monitoring, cost-efficiency, early-stage and quick defect identification (predictive maintenance), distinguish between fault, high fault sensitivity and maintenance budgeting [25].…”