Method for monitoring slow dynamics recovery

Haller, Kristian; Hedberg, Claes

doi:10.1134/s1063771012060061

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…Some typical nonlinear manifestations in resonance frequency testing are the downward shift of the frequency and the increase in attenuation with increasing amplitudes (fast dynamics) [3][4][5]. The logarithmic recovery of this frequency shift with time after a stress or temperature disturbance may also be studied (slow dynamics) [6][7][8]. Furthermore, non-linear characteristics can be revealed by studying the behavior of higher harmonics and interference (modulation) between different frequencies [9,10].…”

Section: Introductionmentioning

confidence: 99%

Damage identification in concrete using impact non-linear reverberation spectroscopy

Dahlen

Rydén

Jakobsson

2015

NDT & E International

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a b s t r a c tHigh amplitude non-linear acoustic methods have shown potential for the identification of micro damage in brittle materials such as concrete. Commonly, these methods evaluate a non-linearity parameter from the relative change in frequency and attenuation with strain amplitude. Here, a novel attenuation model is introduced to describe the free reverberation from a standard impact resonance frequency test, together with an algorithm for estimating the unknown model coefficients. The nonlinear variation can hereby by analyzed over a wider dynamic range as compared to conventional methods. The experimental measurement is simple and fully compatible with the standardized free-free linear impact frequency test.

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Section: Introductionmentioning

confidence: 99%

Damage identification in concrete using impact non-linear reverberation spectroscopy

Dahlen

Rydén

Jakobsson

2015

NDT & E International

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“…This relationship is based on the premise that the deformation strain is the main factor affecting the nonlinear elasticity of rocks [29]. The nonlinearity of rocks becomes significant when the strain is of the order of a microstrain (10 −6 ) [10,29,30]. Thus, we prescribe a fracture energy that changes significantly once the strain is above 10 −6 .…”

Section: B Thermodynamics-based Parametrizationmentioning

confidence: 99%

Nonlinear elasticity in resonance experiments

Sens‐Schönfelder

Snieder

2018

Phys. Rev. B

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“…Haller and Hedberg (Haller & Hedberg, 2008) used a constant strain frequency sweep measurement, and compared the results with the constant force frequency sweep, although the method allows disentangling the material conditioning effect. In a second study, Haller and Hedberg (Haller & Hedberg, 2012) applied a high strain amplitude input at the resonant frequency during 30 minutes in order to induce a material conditioning; thereafter the material nonlinearity was probed at low strain levels for short periods of time at a discrete time 0.2 into the resonator, alternated with 5 seconds of high strain conditioning and so on, in order to determine the resonant frequency. The process was repeated by setting the discrete time point at a higher value.…”

Section: -22mentioning

confidence: 99%

“…Overall, the investigation of careful slow dynamic experiments are time consuming (Haller & Hedberg, 2012;Haller & Hedberg, 2008). Besides, the repeatability of experiments require long rests between tests and controlled temperature and moisture environments (Ten Cate, Duran, & Shankland, 2002).…”

Section: -22mentioning

confidence: 99%

Studies on nonlinear mechanical wave behavior to characterize cement based materials and its durability

Fernández¹,

Nuno²

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Studies on nonlinear mechanical wave behavior to characterize cement based materials and its durability "Estudio del comportamiento no lineal de ondas mecánicas para la caracterización de materiales basados en cemento y su durabilidad" July 2016Autor: Jesús Nuño Eiras Fernández Directores:Jordi Payá Bernabeu John S. PopovicsQuiero expresar mi agradecimiento a mi tutor Jordi Payá por sus acertadas directrices durante la elaboración de esta tesis, por haberme dado la oportunidad de trabajar en este proyecto e iniciarme en la carrera investigadora. Extiendo este agradecimiento al resto del equipo: Mercedes Bonilla, Victoria Borrachero, José Monzó, Ana Mellado y Lourdes Soriano, que con su buen hacer han contribuido a la construcción de un grupo de reconocido prestigio. A mis compañeros con los que he compartido horas en las aulas, laboratorio, y en discusiones de diferente índole: Mauro Tashima (el Special thanks are given to Tribikram Kundu who actively collaborated during the course of this project, and for advice and helpful discussions during the analysis of experimental results. Also, for hosting me during a short stay at University of Arizona.Also thanks are given to Umar Amjad, Ehsan Mahmoudabadi, Ajoy Kumar Das, and Abdullah Al-Hussein for good friendship and helpful discussions during my stay at UA.Special thanks are also given to John S. Popovics, for helpful advice and guidance, and for thoughtful discussions during the course of the PhD. Also, for hosting me and supervising my work at University of Illinois at Urbana-Champaign. I want to extend these thanks to those with whom I shared time in the laboratory at UIUC, preparing samples, No voy a olvidar en estas últimas líneas a mi familia. A mis hermanos Juan y Bárbara, y mis sobrinos Bárbara y Xosé. A Sandra quien ha sido mi apoyo en las buenas y en las malas. Por último, voy a dedicar la tesis a mi madre quien me ha apoyado de forma incondicional y se ha esforzado para ofrecerme siempre lo mejor, y a mi padre, a quien siempre está presente en mi corazón y sé que está conmigo en todo momento.[…] Ring the bells that still can ring, Forget your perfect offeringThere is a crack in everything That's how the light gets in.from Anthem, Leonard Cohen. ResumenLas construcciones de hormigón deben ser diseñadas para perdurar en el tiempo manteniendo su integridad mecánica y sus condiciones de servicio durante la vida útil para la que han sido proyectadas. A este respecto, la evaluación del hormigón y sus constituyentes tanto en laboratorio como en ensayos in situ es, por tanto, esencial para garantizar las condiciones de servicio requeridas al hormigón. El ensayo de determinación de las frecuencias de resonancia ha sido tradicionalmente empleado para determinar la integridad mecánica de testigos de hormigón, en la evaluación de la conformidad de mezclas de hormigón en diversos ensayos de durabilidad, y en la terminación de propiedades constitutivas como son el módulo elástico y el factor de amortiguamiento. Las condiciones del ensayo de determinación de las frec...

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Method for monitoring slow dynamics recovery

Cited by 6 publications

References 14 publications

Damage identification in concrete using impact non-linear reverberation spectroscopy

Damage identification in concrete using impact non-linear reverberation spectroscopy

Nonlinear elasticity in resonance experiments

Studies on nonlinear mechanical wave behavior to characterize cement based materials and its durability

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