Acoustic emission of material damages in glass fibre-reinforced plastics

Bohmann, T.; Schlamp, Matthias; Ehrlich, Ingo

doi:10.1016/j.compositesb.2018.09.018

Cited by 48 publications

(25 citation statements)

References 25 publications

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“…Recently, an AE technique monitoring in plain and steel fiber reinforced concrete specimens was analyzed using unsupervised kernel fuzzy cmeans pattern recognition and the principal component method to categorize various damage stages [28]. Results were reported on AE signatures of synthetic mooring ropes subjected to sinusoidal tension-tension loading in a controlled environment [29], a possible correlation between the dominant failure in glass fibrereinforced plastics and their corrwsponding acoustic emissions was reportedly evaluated [30], the Identification of Active Damage Processes acoustic emission method was reported to be applied to continuous monitoring of active destructive processes in reinforced concrete bridges [31].…”

Section: The Sound Pattern As the Basis For Identification Of Type Anmentioning

confidence: 99%

Use of sound spectral signals analysis to assess the technical condition of mechanical devices

Maciąg

Chałko

2019

MATEC Web Conf.

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The article presents the results of a part of research conducted by the authors into a wide range of work on automation of public safety systems. Their main purpose is to create, on the basis of sound signals analysis, system of warning against the use of firearms monitored public places not only at the time of shooting, but at the stage of preparing - the firearm reloading process. The range of acoustic measurements presented in the article and their analyzes included variability of sound emission of selected type of firearms depending on the number of operations and thus the degree of wear. Analysis of the recorded data will allow in the future to develop a system enabling not only to determine a type of firearm or tp narrow down the search area of individual specimens, but also to determine the degree of wear in terms of suitability for further use. The results discussed in the article correspond to two states of the same firearm model. The first is the initial state from the manufacturer’s factory after returning 50 control shots, the other after over 20,000 cycles. The used firearm was technically fully efficient, with no need to replace the elements during operation as well as tests. The presented scope of measurements includes spectral analysis of sound in the near field and time analysis of sound emission levels in the successive operation phases of the firearm mechanisms.

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Section: The Sound Pattern As the Basis For Identification Of Type Anmentioning

confidence: 99%

Use of sound spectral signals analysis to assess the technical condition of mechanical devices

Maciąg

Chałko

2019

MATEC Web Conf.

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“…[ 43–45 ] This can be used for analysis of crack‐dependent parameters which are set as a function of time and the damage mechanisms are then assigned to the individual clusters. [ 45,46 ] Selected parameters can be also correlated with in‐situ observed damage based on the determined clusters. [ 47–49 ]…”

Section: Introductionmentioning

confidence: 99%

The effect of long‐time moisture exposure and low temperatures on mechanical behavior of open‐hole Cfrp laminate

et al. 2021

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Carbon fiber composite laminates (CFRP) used in aerospace are operating under various environmental conditions. Parts are often exposed to moisture which slowly diffuses into the laminate and forms internal stresses. During the flight, the aircraft is also exposed to low or elevated temperatures. The result is negative impact on composite performance due to formation of hygrothermal stresses. Understanding this phenomenon helps with prediction of the damage development which is vital for increasing the components service life. The open‐hole CFRP laminates were conditioned in humid air at 70°C/85% RH for 33,800 h and the effect of low temperatures on quasi‐cyclic tension properties and fracture behavior was investigated. The mechanical tests on two types of CFRP laminate with different number and orientation of plies were performed under − 55°C. The material behavior during the testing was monitored by acoustic emission technique. The light optical microscopy and scanning electron microscopy were used for the identification of failure mechanisms. The study showed that the hygrothermal effect has significant impact on materials toughness reduction. The damage mechanisms and characteristic morphologic features are changing due to the matrix degradation and weakened fiber/matrix interface.

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“…Fiber reinforced polymers (FRP) are widely used in different sectors, such as aeronautics, construction, wind energy, and the automotive industry, due to their high specific properties, low weight, and ease to manufacture parts of different sizes and forms (Bohmann et al, 2018;Keck & Fulland, 2019;Ramón-Valencia et al, 2015). The most commonly used options, as a complement to FRP, are glass fibers (GFRP) and carbon fibers (CFRP).…”

Section: Introductionmentioning

confidence: 99%

Mechanical characterization of jute fiber based biocomposite to manufacture automotive components

Parra

Valencia

Espinosa

2021

JART

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In this research work, samples of the biocomposite were manufactured using the vacuum assisted resin transfer molding (VARTM) technique, whose matrix is a polyester resin and the reinforcement is a biaxial fabric (90°) made with jute fiber. Then, tensile and flexural tests were carried out on standardized specimens under ASTM standards, in order to mechanically characterize the jute-polyester biocomposite. In both destructive tests, the results showed a linear-elastic behavior with brittle fracture and greater strength of the jute-polyester biocomposite, with respect to the thermosetting matrix’s properties. Subsequently, a finite element based static analysis was performed, with the help of the ANSYS software, to determine the mechanical behavior of interior opening handle for a car door. In it, a model sensitivity study was run to determine the influence of the mesh type and identify the convergence of mesh. Later, the static analysis results were obtained: critical zone, maximum operating stress and safety factors. The results obtained computationally validate the use of jute-polyester biocomposite, as a substitute for the manufacture of an interior opening handle for a car door. Finally, a scale model of the piece made with jute-polyester biocomposite was manufactured.

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Acoustic emission of material damages in glass fibre-reinforced plastics

Cited by 48 publications

References 25 publications

Use of sound spectral signals analysis to assess the technical condition of mechanical devices

Use of sound spectral signals analysis to assess the technical condition of mechanical devices

The effect of long‐time moisture exposure and low temperatures on mechanical behavior of open‐hole Cfrp laminate

Mechanical characterization of jute fiber based biocomposite to manufacture automotive components

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