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The AE signal is correlated with load change, according to the results of the experiment, and the accumulation of AE signals of reinforced concrete pipe segments can help identify the failure characteristics of reinforced concrete pipe segments. Because of this, the segment mechanical loading test can be used as an efficient way to investigate the local load stress distribution of full-scale pipe.
Source link: https://doi.org/10.1007/978-981-19-4067-5_21
Methods to analyze materials and systems in the context of SHM. The use of ultrasonic waves in the context of SHM provides methods to investigate samples and systems. The use of the piezoelectric and inverse piezoelectric effect is a highly accurate way to detect and exciting ultrasonic waves. Different excitation signals are compared experimentally in frequency domain by quick Fourier's change and in time-frequency domain by continuous wavelet transform, for example in this contribution. Frequency and fiber direction independent damping factors of ultrasonic waves in CFRP are established, as well as the transducers' presence.
Source link: https://doi.org/10.1007/978-3-031-07322-9_82
On a 5 mm u00d7 5 mm chip, a piezoelectric multi-user MEMS process is used to microfabricate a 4 u00d7 4 array diaphragms ranging from 100 kHz to 700 kHz. Sensor array response are determined by numerical models that are built to analyze the behavior of individual elements and array. The introduced sensor's low cost and mass manufacturing of the sensor allows for the construction of a dense distributed sensor network for cyberphysical networks.
Source link: https://doi.org/10.1007/978-3-031-07254-3_65
Both manufacturing-induced defects such as fiber misalignment or pores, as well as usage induced injuries such as delamination caused by e. g. The authors' paper contains the most recent findings on-line Acoustic Emission tracking of various pre-damaged composite coupons. The Acoustic Emission signature was determined by load and damage status, and was exposed to a variety of interrupted specific loads; u2013 bending, shear, tensile, and tensile fatigue loads –u2013 to investigate the Acoustic Emission signature in dependence of load and damage status.
Source link: https://doi.org/10.1007/978-3-031-07322-9_89
Acoustic emission detection can be used to develop the true-time passive SHM device. As an alternative, optical fiber sensors are also useful for designing high-temperature sensing systems because they are made from silica glass with excellent heat resistance over 1000 °C. Sensors of AE detection have been widely used in AE detection as a component of optical fiber sensors. The RFBG is made by annealing the conventional FBG to a high temperature of 920 u00b0C. The RFBG was then used to find simulated AE waves that had been ignited by laser irradiation on the surface of a ceramic plate in a high-temperature furnace heated up to 1000 °C. Based on the experimental findings, we conclude that the use of RFBG sensors leads to the development of a RFBG-based high-temperature SHM device.
Source link: https://doi.org/10.1007/978-3-030-93236-7_16
This work provides acoustic emission analysis of steel steels used in SA 387 pressure vessel steel subjected to tensile loading subjected to tensile loading. AE signals were detected and investigated using a specially tailored device developed by Physical Acoustics. The results of this research revealed that intense AE signals were present in micro-plastic and fracture regions, as well as fracture areas. In some regions, whereas in the rest of regions, progressively rising micro-plastic deformation and fracture rates have been evident. The AE source is found using the time difference of arrival methods.
Source link: https://doi.org/10.1007/978-3-031-15758-5_81
This paper will explore the behavior and damage response of a 3D printed sandwich composite using an acoustic emission technique under indentation test. Acoustic emission technology is used to track undetected damage creation and spread in the sandwich composite's sandwich composite. The detected AE data signals are then post-processed in accordance with unsupervised pattern algorithm. By the use of the K-mean algorithm, the AE signals are identified. The amplitude of the AE data points varies from 40 to 80 dB, indicating invisible damage initiation and propagation. The analysis indicates that there are three main events: the core cracking, the matrix cracking, and the fiber/matrix debonding. It's estimated that each damage process contributed to the sandwich composite's total failure. Accordingly, AE classes are closely related to each damage mechanism.
Source link: https://doi.org/10.1007/978-3-031-14615-2_65
A significant challenge in civil engineering is to investigate the condition of concrete structures for evaluation of the integrity. Hence, long-term acoustic monitoring in the context of structural health monitoring has been carried out during a dynamic three-point bending experiment to discover the fatigue behavior of a prestressed reinforced concrete railroad switch sleeper. Microcrack detection in concrete was especially developed for the detection of microcracks in cyclic loading broadband AE sensors with a measurement frequency of up to 200 kHz. A network of 16 of these AE sensors was attached to the surface of the object for automatic three-dimensional location of the AE sources. The results of AE monitoring indicate that the AE job starts immediately after starting dynamic loading. The railroad switch sleeper's demise occurred after several microscopic cracks were discovered.
Source link: https://doi.org/10.1007/978-3-031-07254-3_61
These thin PZT sensors have a great ability for passive sensing AE signals. This paper explores the challenges and potential solutions in relation to the selective selection and use of thin PZT sensors for passive sensing. Using pencil break lead tests, the compatibility of various thin PZT sensors with conventional bulky sensors is investigated. Based on machine learning algorithms and sensor data fusion, a strategy based on machine learning algorithms and sensor data fusion is suggested to increase the stability and performance of the thin PZT sensors' reliability and performance.
Source link: https://doi.org/10.1007/978-3-031-07254-3_62
Due to its long structural life, Reinforced Concrete Pavement, which is basically a reinforced concrete slab, has become extremely popular in recent years. According to available literature, acoustic emission is a very useful method for structural health monitoring for detection of injury in similar pavements in real-time. The latest review of the available literature shows that analysis of the AE waveforms in the frequency domain, using Quick Fourier Transform, Short Time Fourier Transform, or in a time frequency domain using wavelet transform is also being used by the researchers in the past for localizing the damage in thin metal and multi-layered composite plates. However, the applicability of wavelet transform of AE waves in localizing the harm in RC slabs is found to be lacking in literature, as per the authors' current knowledge.
Source link: https://doi.org/10.1007/978-3-031-05509-6_13
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