Acoustic emission for interlaminar toughness testing of CFRP: Evaluation of the crack growth due to burst analysis

Lissek, Fabian; Haeger, Andreas; Knoblauch, Volker; Hloch, Sergej; Pude, Frank; Kaufeld, Michael

doi:10.1016/j.compositesb.2017.10.012

Cited by 47 publications

(20 citation statements)

References 24 publications

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“…Figure 7 shows the relationship of the AE amplitude and accumulation energy–time, where the instantaneous energy release events accompany the generation of higher amplitude AE signals, and the energy–time curves feature a multistage staircase consistent with Ref [ 23 ]. The fact that the literature presented a multistage staircase in the same thickness layer composite but with various matrix and fiber types is particularly worth mentioning [ 23 ]. This multistage staircase phenomenon reflects the essence of energy release events, such as fiber failure and unstable matrix crack propagation.…”

Section: Resultssupporting

confidence: 75%

“…The energy calculation of the AE signal is processed by the root mean square ( V rms ) or mean square ( V ms ) of the voltage. The V ms , V rms , and relative energy ( E ) of a signal are defined as Equations (1) and (2), as follows [ 23 ]. According to the fundamental principles of acoustic emission, the change of V ms with time is the energy change rate of the AE signal, and the total energy E of the AE signal in the period from t 1 to t 2 can be expressed in Equation (3).…”

Section: Methodsmentioning

confidence: 99%

“…The acoustic emission (AE) technique is a nondestructive testing method that is used to detect stress waves that result from the release of elastic energy due to local rapid unloading [ 15 , 16 , 17 , 18 ]. AE technology is also used to obtain dynamic information during the process of damage initiation and evolution, providing a basis for the safety evaluation of composite materials or construction [ 19 , 20 , 21 , 22 , 23 , 24 ]. In recent years, AE technology has been widely used to identify and distinguish different damage modes in the field of composite laminates.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties of Thin-Ply Composites Based on Acoustic Emission Technology

Zheng

Cao

et al. 2021

Materials

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Compared with standard-ply composites, thin-ply composites exhibit a superior mechanical performance under various operating conditions due to their positive size effects. Thin-ply laminate failure modes, including matrix initial damage (MID), matrix failure (MF), and fiber failure (FF), have been distinguished through a systematic acoustic emission (AE) signals analysis combined with scanning electron microscopy (SEM). First, the characteristic frequencies of various failure modes are identified based on unidirectional laminates ([90] 68 and [0] 68). Then, according to the identified frequencies corresponding to distinctive damage modes, four lay-up sequences (02[[90m/0m]ns]02, m = 1, 2, 4, 8, n × m = 16) with a constant total thickness are designed, and the effects of the number of identical plies in the laminate thickness on the damage evolution characteristics and the damage process under uniaxial tension loads are dynamically monitored. The obtained results indicate that the characteristic frequency ranges for MID, MF, and FF are identified as 0–85 kHz, 165–260 kHz, and 261–304 kHz, respectively. The thickness of identical plies has a significant effect on onset damage. With the decrease of the number of identical plies (i.e., m in the stacking sequences), the thin-ply laminates exhibit the initiation of damage suppression effects and crack propagation resistance.

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Section: Resultssupporting

confidence: 75%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties of Thin-Ply Composites Based on Acoustic Emission Technology

Zheng

Cao

et al. 2021

Materials

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“…Determination of crack propagation in structures plays an important role in the fracture mechanics of composites and can be investigated by using the acoustic emission (AE) technique [ 28 ]. The non-destructive AE method can be utilized in detecting the real delamination onset in damage initiation analysis.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Delamination in Composite Continuous Fiber-Reinforced Plastic Laminates with Elastic Couplings

2020

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This paper presents an experimental evaluation of influence of the elastic couplings on the fracture toughness as well as on delamination initiation and propagation in carbon/epoxy composite laminates. For this purpose the mode I double cantilever beam (DCB) tests according to the American Society for Testing and Materials (ASTM) D5528 Standard were performed on specimens with different delamination interfaces and specific lay-ups composition exhibiting the bending-twisting (BT) and the bending-extension (BE) couplings. The critical strain energy release rates (mode I c-SERR, GIC) were calculated by using the classical methods, namely: the modified beam theory (MBT), the compliance calibration (CCM) and the modified compliance calibration (MCC). In order to evaluate an accuracy of the different methods, the values of c-SERR obtained by using standardized data reduction schemes were compared with values calculated by using the compliance based beam method (CBBM). All the methods give rise to comparable values of the GIC, which makes the CBBM an appealing choice, since it does not depend on crack length monitoring during the test. Initiation and propagation of delamination were investigated by using the acoustic emission (AE) technique. Moreover, the scanning electron microscope (SEM) analysis were performed after the experimental tests in order to investigate a fracture surface at delamination plane.

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“…The cumulative AE energy of the UD laminate mainly comes from matrix cracking, and the crack propagation always propagates horizontally along the center line of the pre-crack at an almost constant rate, and the cumulative AE energy and cumulative counting curves are relatively smooth. The cumulative AE energy and cumulative count of the 30 • laminate show a multi-step phenomenon, in which the instantaneous energy release rate is accompanied by the generation of higher amplitude AE signals, and the cumulative energy and time curve of acoustic emission has a multi-stage ladder consistent with [53]. This phenomenon of multi-step ladders reflects the essence of the sudden increase in the energy release rate caused by fiber fracture and the unstable propagation of matrix cracks.…”

Section: Analysis Of Acoustic Emission and Damage Mechanism Of Lamina...mentioning

confidence: 89%

Study on Delamination Damage of CFRP Laminates Based on Acoustic Emission and Micro Visualization

Liu

Jiang

et al. 2022

Materials

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This study investigated the mechanism of delamination damage in the double cantilever beam (DCB) standard test by the use of the strain energy release rate. The curve of the strain energy release rate was verified by the Rise Angle (RA) method. For this purpose, 24-layer carbon fiber/epoxy multidirectional laminates with interface orientations of 0°, 30°, 45°, and 60° were fabricated according to the standard ASTM D5528(13). In the course of this test, acoustic emission (AE) was used for real-time monitoring, and combined with micro visualization, the damage mechanism of composite multidirectional laminates was studied at multiple scales. Combining the AE detection results with micro visualization, it is found that the AE parameters and the damage to multidirectional laminates could realize a one-to-one correspondence. Through the study of the variation of the RA value, load, and strain energy release rate with the crack length, it is proved that the AE parameters can effectively characterize the initiation of delamination damage.

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Acoustic emission for interlaminar toughness testing of CFRP: Evaluation of the crack growth due to burst analysis

Cited by 47 publications

References 24 publications

Mechanical Properties of Thin-Ply Composites Based on Acoustic Emission Technology

Mechanical Properties of Thin-Ply Composites Based on Acoustic Emission Technology

Experimental Investigation of Delamination in Composite Continuous Fiber-Reinforced Plastic Laminates with Elastic Couplings

Study on Delamination Damage of CFRP Laminates Based on Acoustic Emission and Micro Visualization

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