Dynamic Acousto-Elasticity in a Fatigue-Cracked Sample

Rivière, Jacques; Remillieux, Marcel C.; Ohara, Yoshikazu; Anderson, Brian E.; Haupert, Sylvain; Ulrich, Timothy J.; Johnson, P. A.

doi:10.1007/s10921-014-0225-0

Cited by 37 publications

(31 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Longitudinal, shear (Lott et al 2017) and complex flexural deformation from impacts (Eiras et al 2016) have been used as excitation. The response of a single fatigue crack was investigated (Rivière et al 2014) as well as the in situ nonlinearity of soil on the scale of metres using seismic equipment and a vibrator truck (Renaud et al 2014). Rivière et al (2016) studied the frequency, pressure and strain dependency of the nonlinear response.…”

Section: Daet Experimentsmentioning

confidence: 99%

A Model for Nonlinear Elasticity in Rocks Based on Friction of Internal Interfaces and Contact Aging

Sens‐Schönfelder

Snieder

2018

Geophysical Journal International

View full text Add to dashboard Cite

Non-classical nonlinear elasticity in micro-inhomogeneous materials such as rocks and cracked or granular materials leads to a number of phenomena ranging from hysteresis and memory to a transient response of elastic properties to perturbations in dynamic or quasi-static experiments. Dynamic acousto-elastic testing (DAET) provides very detailed observations of some of these phenomena that are still not fully understood in terms of their physical origin. We suggest that the observations of non-classical nonlinear elasticity can be related to the physics of friction. We propose a conceptual model for the nonlinear elasticity based on friction of internal interfaces and the process of contact aging that leads to an increase of friction with increasing contact time. The central element of the model is the continuous interplay between (1) softening that occurs as small-scale damage due to shear motion of internal contacts and (2) stiffening (healing) as a thermally activated process of establishing connections across the contact at the current strain state. Chemical bonds, mineral fibres or capillary bridges are the most likely candidates for the physical nature of these connections. Our model qualitatively describes dynamic softening, hysteresis, slow dynamics and the shape of DAET loops including the absence of cusps and the loop orientation that leads to a stiffening at both maxima and minima of the dynamic strain.

show abstract

Section: Daet Experimentsmentioning

confidence: 99%

A Model for Nonlinear Elasticity in Rocks Based on Friction of Internal Interfaces and Contact Aging

Sens‐Schönfelder

Snieder

2018

Geophysical Journal International

View full text Add to dashboard Cite

show abstract

“…Considering possible experimental application, the method would allow one to perform an in-situ imaging of the defect. Therefore, the external laser vibrometer scanning of the sample done in previous time reversal applications [36][37][38][39][40][41][42][43][44][45][46][47] to detect the re-focusing of the second harmonic would not be necessary. Fig.…”

Section: Closed Crack Imaging From Fundamental and Second Harmonic Scmentioning

confidence: 99%

“…Previous attempts at nonlinear ultrasonic imaging can be divided into two groups depending on whether the image reconstruction process involves (i) a point by point scanning of the ultrasonic response at every point (or pixel) within a prescribed imaging domain, usually (but not necessarily) using a laser vibrometer [36][37][38][39][40][41][42][43][44][45][46][47], or (ii) implementing an imaging algorithm that uses as input the measurements recorded by a sensor array deployed around and outside the imaging domain [48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65]. The present work belongs to the second group, which is of greater interest for structural health monitoring based on built-in sensor arrays.…”

Section: Introductionmentioning

confidence: 99%

Closed crack imaging using time reversal method based on fundamental and second harmonic scattering

et al. 2016

View full text Add to dashboard Cite

A recent variant of time reversal imaging is employed for reconstructing images of a closed crack, based on both the fundamental and the second harmonic components of the longitudinal scattered field due to an incident longitudinal wave. The scattered field data are generated by a finite element model that includes unilateral contact with Coulomb friction between the crack faces to account for the Contact Acoustic Nonlinearity. The closure state of the crack is controlled by specifying a pre-stress between the crack faces. The knowledge of the scattered field at the fundamental (incident) frequency and the second harmonic frequency for multiple incident angles provides the required inputs for the imaging algorithm. It is shown that the image reconstructed from the fundamental harmonic closely matches the image that is obtained from scattering data in the absence of contact, although contact between the crack faces reduces the amplitude of the scattered field in the former case. The fundamental harmonic image is shown to provide very accurate estimates of crack length for low to moderate levels of pre-stress. The second harmonic image is also shown to provide acceptable estimates of crack length and the image is shown to correlate with the source location of second harmonic along the crack, which becomes increasingly localized near the crack tips for decreasing levels of pre-stress. The influence of the number of sensors on the image quality is also discussed in order to identify the minimum sensors number requirement. Finally, multiple frequency imaging is performed over a fixed bandwidth to assess the potential improvement of the imaging algorithm when considering broadband information.

show abstract

“…13,14 Dynamic Acousto-Elastic Testing is a low frequency pump and higher frequency probe technique that was used by Rivière et al to extract and additional nonlinear parameters. 15 Ohara et al used NRUS to locate SCC by analyzing the measured from a couple different resonance modes based on whether the mode had a strain node or antinode at the location of the SCC. 16 An experiment by Morlock et al used nonlinear Rayleigh surface waves to characterize SCC on four samples with different amounts of SCC.…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

Characterizing stress corrosion cracking in stainless steel using nonlinear resonant ultrasound spectroscopy

Hogg

Anderson

2018

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

All Rights Reserved ii iii ABSTRACT Characterizing stress corrosion cracking in stainless steel using nonlinear resonant ultrasound spectroscopy Spent nuclear fuel rods are stored in stainless steel containers and may be stored for decades. In order prevent radiation leakage, the stainless steel structure must not be compromised. These containers are susceptible to stress corrosion cracking (SCC). Traditional nondestructive evaluation methods have been developed to detect open cracks but these cannot detect the closed portion of the crack that may extend further. Nonlinear Resonant Ultrasound Spectroscopy (NRUS) is used here to determine if it can be used to quantify a cumulative amount of SCC in a structure. To induce SCC in a timely manner, cylindrical, 304L stainless steel rods are immersed in a heated 42% magnesium chloride solution. A set of rods are removed one by one after different lengths of exposure to the hot magnesium chloride solution. NRUS measurements are then conducted on longitudinal modes in the rods. Rods exposed longer did indeed result in a larger resonance frequency shift, and therefore a larger nonlinear parameter, , in NRUS measurements. It is observed that α can be used to detect SCC before visible cracks appear on the rods. iv

show abstract

Dynamic Acousto-Elasticity in a Fatigue-Cracked Sample

Cited by 37 publications

References 27 publications

A Model for Nonlinear Elasticity in Rocks Based on Friction of Internal Interfaces and Contact Aging

A Model for Nonlinear Elasticity in Rocks Based on Friction of Internal Interfaces and Contact Aging

Closed crack imaging using time reversal method based on fundamental and second harmonic scattering

Characterizing stress corrosion cracking in stainless steel using nonlinear resonant ultrasound spectroscopy

Contact Info

Product

Resources

About