Crack localization in a double-punched concrete cuboid with time reverse modeling of acoustic emissions

Kocur, Georg Karl; Vogel, Thomas; Saenger, Erik H.

doi:10.1007/s10704-011-9621-y

Cited by 19 publications

(5 citation statements)

References 16 publications

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“…A common concrete mix (C30/37) with a maximum aggregate size of 16 mm was modeled using a custom Numerical Concrete Model (NCM) [29]. Since a contact problem of such heterogeneous material involves numerical instabilities and high computational cost, the three-dimensional NCM was homogenized to a Representative Volume Element (RVE).…”

Section: Numerical Simulation With Finite Element Methodsmentioning

confidence: 99%

“…Since a contact problem of such heterogeneous material involves numerical instabilities and high computational cost, the three-dimensional NCM was homogenized to a Representative Volume Element (RVE). The material parameters of the RVE have been validated in prior investigations [28,29]. The plastic behavior of concrete was approximated by a continuum-based damage model, referred to as concrete damage plasticity (CDP).…”

Section: Numerical Simulation With Finite Element Methodsmentioning

confidence: 99%

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Automated identification of the coefficient of restitution via bouncing ball measurement

et al. 2020

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Material characterization of brittle and ductile materials, by means of determining characteristic material parameters such as hardness, elastic moduli or yield strength, is of significance to the scientific community. The evaluation of indentations on micro-and macro-scale can be employed to characterize materials but is governed by highly sensitive acquisition hardware and complex analysis. Profound analytical, experimental, and numerical approaches exist to evaluate the impact of spherical indenters on a plane surface but require a deep knowledge of plasticity and computational mechanics. This work aims to provide a generalized analysis tool, which is based on fundamental Newtonian mechanics, to be applied on brittle and ductile materials of homogeneous and heterogeneous constitution. Based on bouncing ball measurements, the coefficient of restitution is evaluated to determine the homogeneity and degree of plasticity of the selected material. The measurements are supported with additional physical (e.g., electron micrographs, velocimetry) and numerical (Finite Element) investigations. It can be demonstrated that the evaluation of the bouncing trajectories provides essential information on the plasticity and topology of the selected material and leads to adequate results compared to complex experimental and numerical analysis.

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Section: Numerical Simulation With Finite Element Methodsmentioning

confidence: 99%

Section: Numerical Simulation With Finite Element Methodsmentioning

confidence: 99%

Automated identification of the coefficient of restitution via bouncing ball measurement

et al. 2020

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“…The velocity model is, however, of main concern in this study. In all what follows, the p-wave velocity in air was assumed to be zero, the p-wave velocity in steel was assumed to be c p = 5900 m/s (value taken from [6]) and the p-wave velocity in concrete was determined experimentally. The location of the sensors and the source are known a priori.…”

Section: Localization Methodsmentioning

confidence: 99%

A Novel Multi-Segment Path Analysis-Based Technique for Acoustic Emission Source Localization in Complex Solid Media

Gollob¹,

Mhamdi²,

Kocur³

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Abstract. FastWay is a novel method for source localization of acoustic emissions (AE) in complex solid media. It uses the fastest, rather than the shortest wave path between the AE source and the recording sensors. In this paper we investigate the potential of this method for acoustic emission source localization in concrete structures. To consider the influence on the wave propagation of both the concrete heterogeneity and the possible cracks present in the tested specimen, a heterogeneous velocity model was selected and a multi-segment path analysis based on this model was performed. After validating the model numerically using simulated AE sources, laboratory experiments were conducted on a small concrete beam (152 mm × 152 mm × 533 mm) with a predefined notch cut to serve as a material discontinuity (crack). Artificial AE sources using pencil-lead breaks were applied on a 25.4 mm × 25.4 point grid mapped on the surface of the beam. To evaluate the performance of FastWay, a set of sources randomly selected were picked and localization results using both FastWay and Geiger's method compared. The results obtained show that FastWay performs more reliably and accurately than Geiger's algorithm even in the presence of cracks and air inclusions. No major influence of these two factors was seen on the localization results. The influence considered the most crucial, however, is of the velocity model which strongly depends on the complex internal structure of the tested specimen.

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“…Various localization methods were established with applications ranging from seismology [2] through construction materials [3][4][5][6]. Further methods based on the elastic wave propagation take into account the entire information on the Green's function and allow for applications in medicine [7] or SHM/NDT of structural components [8,9]. A comprehensive overview of source localization methods can be found in [10].…”

Section: Introductionmentioning

confidence: 99%

On the optimal localization of pendulum impacts using a non‐contact acoustic array

Kocur

Markert

2023

Proc Appl Math and Mech

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The presented work aims to adapt a Geiger‐based method and localize pendulum impacts applied on a rigid steel plate using the data set of a 112 microphone array. The advantage compared to measurements with piezoelectric sensors, where normally a number of sensors are involved, is the superior number of microphones. To solve the Geiger algorithm on the three‐dimensional domain, at least data from three sensors and the primary wave velocity are required (four equations). Moreover, if the system of equations is overdetermined, an error minimization can be performed, for example, with the least‐squares method. Since in this work the distance between array and plate is constant, the algorithm can be even reduced to a two‐dimensional problem (only three equations required). Indeed, the superior overdetermination of 112 microphone data allows to index the optimal data set by combing microphone data and thus achieve the best localization results for the optimal microphone. This study is relevant to the scientific community because it will allow uncontrolled events cracks or other damage to be localized with a great accuracy and reliability.

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Crack localization in a double-punched concrete cuboid with time reverse modeling of acoustic emissions

Cited by 19 publications

References 16 publications

Automated identification of the coefficient of restitution via bouncing ball measurement

Automated identification of the coefficient of restitution via bouncing ball measurement

A Novel Multi-Segment Path Analysis-Based Technique for Acoustic Emission Source Localization in Complex Solid Media

On the optimal localization of pendulum impacts using a non‐contact acoustic array

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