Influence of source frequency on impact-echo data quality for testing concrete structures

Colla, Camilla

doi:10.1016/s0963-8695(02)00062-2

Cited by 30 publications

(16 citation statements)

References 4 publications

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“…Colla et al. 12 applied a stress pulse to the structure by an impact source. The resulting stress waves propagated into the structure are reflected by occurring defects (cracks, disbonds, etc).…”

Section: Introductionmentioning

confidence: 99%

“…In the same decade of the 1990s, Stokes et al 8 and Liang et al 9 and 10 years later Bhalla et al 10,11 developed local scale methods based on the evaluation of the changes in structural impedance. Colla et al 12 applied a stress pulse to the structure by an impact source. The resulting stress waves propagated into the structure are reflected by occurring defects (cracks, disbonds, etc).…”

Section: Introductionmentioning

confidence: 99%

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Improved elliptical triangulation method for damage detection in composite material structures

Sorrentino

Fenza

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, an improvement of the elliptical triangulation method for damage detection using Lamb waves is presented. The damage is the main cause of structural failure and often occurs on structures. In order to avoid sudden failure, a special attention was given in the past decades to the damage detection in structures. In order to obtain efficient damage detection techniques, the structural health monitoring has been the main research topic of many scientists worldwide. The elliptical triangulation method, proposed in this paper, is a non-destructive method based on measurement of Lamb waves. This method, through the calculation of the time of flight of the signals and the actuator-sensor positioning, allows to identify position and dimension of the damage. The application of the method to the metallic structures and to the composite material structures is presented in this paper. The complexity connected with the uncertainty of the waves’ propagation speed due to the anisotropy of the composite materials has been explored through an iterative approach. The initialization of the wave propagation speed at first tentative iteration is the key issue for the convergence of the method. Seven different conditions were used to validate the method on both metallic and composite structures combining two damage shapes, two damage dimensions (effective damaged area), and three different positions. Upon evaluating the effectiveness, the method has been applied at two composite panels in order to detect by test the post-impact damages. Tests results have been compared with the numerical ones. The feasibility of the elliptical triangulation method to detect the damage (evaluating the damage position and area) has been proved using the ultrasonic C-Scan.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved elliptical triangulation method for damage detection in composite material structures

Sorrentino

Fenza

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…On the other hand, intrinsic attenuation or absorption is because of internal friction of the material. Attenuation of elastic waves is highly governed by the inelastic properties of the medium, while the travel time of the elastic wave depends on the elastic properties and medium density [26,27,28,29,30]. …”

Section: Tomogramsmentioning

confidence: 99%

Development of a Tomography Technique for Assessment of the Material Condition of Concrete Using Optimized Elastic Wave Parameters

et al. 2016

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Concrete is the most ubiquitous construction material. Apart from the fresh and early age properties of concrete material, its condition during the structure life span affects the overall structural performance. Therefore, development of techniques such as non-destructive testing which enable the investigation of the material condition, are in great demand. Tomography technique has become an increasingly popular non-destructive evaluation technique for civil engineers to assess the condition of concrete structures. In the present study, this technique is investigated by developing reconstruction procedures utilizing different parameters of elastic waves, namely the travel time, wave amplitude, wave frequency, and Q-value. In the development of algorithms, a ray tracing feature was adopted to take into account the actual non-linear propagation of elastic waves in concrete containing defects. Numerical simulation accompanied by experimental verifications of wave motion were conducted to obtain wave propagation profiles in concrete containing honeycomb as a defect and in assessing the tendon duct filling of pre-stressed concrete (PC) elements. The detection of defects by the developed tomography reconstruction procedures was evaluated and discussed.

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“…Due to the larger wavelengths (typically greater than 10 cm) required for the IE method, wave diffusion through aggregates, cracks, and pores has less degrading effects than in ultrasonic testing [24,25]. Therefore, IE provides a viable solution for non-destructive testing of masonry assemblies.…”

Section: Vault-to-vault Variability Due To Materialsmentioning

confidence: 99%

Vibration characteristics of vaulted masonry monuments undergoing differential support settlement

Atamturktur

Bornn

Hemez

2011

Engineering Structures

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Influence of source frequency on impact-echo data quality for testing concrete structures

Cited by 30 publications

References 4 publications

Improved elliptical triangulation method for damage detection in composite material structures

Improved elliptical triangulation method for damage detection in composite material structures

Development of a Tomography Technique for Assessment of the Material Condition of Concrete Using Optimized Elastic Wave Parameters

Vibration characteristics of vaulted masonry monuments undergoing differential support settlement

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