Acoustic emission detection using a piezoelectric strain gauge for failure mechanism identification in cfrp

White, Robert G.; Trétout, H.

doi:10.1016/0010-4361(79)90011-9

Cited by 12 publications

(2 citation statements)

References 5 publications

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“…Initially the frequency analysis of the acoustic signals has been used and giving way progressively to the amplitude analysis to examine failure mechanisms . Most authors suggest that weak signals and hence low amplitude can be expected from the microcracking of the matrix resin, medium values for interfacial failure, and high amplitude for fiber breaks . But Valentin et al have reported the highest amplitude signals correspond to the matrix cracking parallel to fibers, whereas the fiber failure results in smaller amplitude emissions because of the dimensions of the fiber for carbon fiber/epoxy composites.…”

Section: Hydrothermal Effect On Mechanical Behaviormentioning

confidence: 99%

Environmental damage and degradation of FRP composites: A review report

Ray

Rathore

2014

Polymer Composites

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Fiber‐reinforced plastics (FRP) composites are prime choice materials in various civil engineering structures and high performance aerospace components. They exhibit superior mechanical properties than their metallic counterparts. However, they are susceptible to environmental damages and degradations. To utilize the full potential of FRP composite materials their physical, chemical, and mechanical behavior in different environmental conditions should be well established. Present review is an attempt at highlighting different damage/degradations that may be caused to the FRP composite on its exposure to various environmental conditions. POLYM. COMPOS. 36:410–423, 2015. © 2014 Society of Plastics Engineers

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Section: Hydrothermal Effect On Mechanical Behaviormentioning

confidence: 99%

Environmental damage and degradation of FRP composites: A review report

Ray

Rathore

2014

Polymer Composites

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“…However, they featured two shortcomings that limited their application in strain-based SHM in civil structures: difficulty in measuring the true static value and sensitivity to transverse strain. While their application in strain-based SHM was not fruitful, sensors with piezo-electric sensing elements found widespread applications in other SHM approaches, such as acoustic and wave-propagation-based SHM (e.g., [ 48 , 49 ]). Given their excellent potential for accurate strain measurement, the research on this type of sensor continues (e.g., [ 50 , 51 ]).…”

Section: First Generation: Discrete Short-gauge Electrical Strain Sen...mentioning

confidence: 99%

Concise Historic Overview of Strain Sensors Used in the Monitoring of Civil Structures: The First One Hundred Years

Glišić

2022

Sensors

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Strain is one of the most frequently monitored parameters in civil structural health monitoring (SHM) applications, and strain-based approaches were among the first to be explored and applied in SHM. There are multiple reasons why strain plays such an important role in SHM: strain is directly related to stress and deflection, which reflect structural performance, safety, and serviceability. Strain field anomalies are frequently indicators of unusual structural behaviors (e.g., damage or deterioration). Hence, the earliest concepts of strain sensing were explored in the mid-XIX century, the first effective strain sensor appeared in 1919, and the first onsite applications followed in the 1920′s. Today, one hundred years after the first developments, two generations of strain sensors, based on electrical and fiber-optic principles, firmly reached market maturity and established themselves as reliable tools applied in strain-based SHM. Along with sensor developments, the application methods evolved: the first generation of discrete sensors featured a short gauge length and provided a basis for local material monitoring; the second generation greatly extended the applicability and effectiveness of strain-based SHM by providing long gauge and one-dimensional (1D) distributed sensing, thus enabling global structural and integrity monitoring. Current research focuses on a third generation of strain sensors for two-dimensional (2D) distributed and quasi-distributed sensing, based on new advanced technologies. On the occasion of strain sensing centenary, and as an homage to all researchers, practitioners, and educators who contributed to strain-based SHM, this paper presents an overview of the first one hundred years of strain sensing technological progress, with the objective to identify relevant transformative milestones and indicate possible future research directions.

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Acoustic emission during irreversible deformation in short fiber reinforced poly(vinyl chloride) composites

1986

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Acoustic emission (AE) during irreversible deformation in short glass fiber reinforced poly(viny1 chloride] (PVC) composites was studied using a piezoelectric crystal transducer. Compared to the well-coupled composites, many more AE events were observed during tensile deformation in the poorly-coupled composites, presumably due to failure at the fiber-matrix interface. No fiber fracture was detected in the tensile tests for either well-coupIed or poorly-coupled composites. Irreversibility of acoustic emission was observed in repeated tensile loading experiments.Unlike PVC, the short fiber composites fractured during stress relaxation at 1 percent elongation. Studies of acoustic emission behavior during stress relaxation indicated that interfacial debonding is a time-dependent process. Relaxation fracture time was strongly increased by chemical coupling at the interface.

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Acoustic emission detection using a piezoelectric strain gauge for failure mechanism identification in cfrp

Cited by 12 publications

References 5 publications

Environmental damage and degradation of FRP composites: A review report

Environmental damage and degradation of FRP composites: A review report

Concise Historic Overview of Strain Sensors Used in the Monitoring of Civil Structures: The First One Hundred Years

Acoustic emission during irreversible deformation in short fiber reinforced poly(vinyl chloride) composites

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