Guided wave velocity sensitivity to bone mechanical property evolution in cortical-marrow and cortical-trabecular phantoms

2015 ◽  
Vol 138 (3) ◽  
pp. 1799-1799
Author(s):  
Alexandre Abid ◽  
Dhawal Thakare ◽  
Daniel Pereira ◽  
Prabu Rajagopal ◽  
Julio Fernandes ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Wave Velocity ◽  
Guided Wave ◽  
Velocity Sensitivity ◽  
Bone Mechanical Property

scholarly journals Guided Wave Propagation in Detection of Partial Circumferential Debonding in Concrete Structures

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 2199 ◽  
Author(s):  
Beata Zima
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Wave Velocity ◽  
Guided Waves ◽  
Concrete Structures ◽  
Circular Cross Section ◽  
Guided Wave ◽  
Experimental Results ◽  
Reinforced Concrete Beams ◽  
Average Wave

The following article presents results of investigating the damage detection in reinforced concrete beams with artificially introduced debonding between the rod and cover, using a non-destructive method based on elastic waves propagation. The primary aim of the research was to analyze the possible use of guided waves in partial circumferential debonding detection. Guided waves were excited and registered in reinforced concrete specimens with varying extents of debonding damage by piezoelectric sensors attached at both ends of the beams. Experimental results in the form of time–domain signals registered for variable extent of debonding were compared, and the relationships relating to the damage size and time of flight and average wave velocity were proposed. The experimental results were compared with theoretical predictions based on dispersion curves traced for the free rod of circular cross-section and rectangular reinforced concrete cross-section. The high agreement of theoretical and experimental data proved that the proposed method, taking advantage of average wave velocity, can be efficiently used for assessing debonding size in reinforced concrete structures. It was shown that the development of damage size in circumferential direction has a completely different impact on wave velocity than development of debonding length. The article contains a continuation of work previously conducted on the detection of delamination in concrete structures. The proposed relationship is the next essential step for developing a diagnostics method for detecting debondings of any size and orientation.

Histomorphometry and Bone Mechanical Property Evolution Around Different Implant Systems at Early Healing Stages

2013 ◽  
Vol 22 (6) ◽  
pp. 596-603 ◽  
Author(s):  
Ryo Jimbo ◽  
Rodolfo Anchieta ◽  
Marta Baldassarri ◽  
Rodrigo Granato ◽  
Charles Marin ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Bone Mechanical Property ◽  
Early Healing

Marine guided waves: Subbottom property estimation and filtering using physical modeling data

Geophysics ◽  
2016 ◽  
Vol 81 (4) ◽  
pp. V303-V315 ◽  
Author(s):  
Jiannan Wang ◽  
Robert R. Stewart ◽  
Nikolay I. Dyaur ◽  
M. Lee Bell
Keyword(s):  
Wave Velocity ◽  
Physical Modeling ◽  
Guided Waves ◽  
Theoretical Calculations ◽  
Wave Dispersion ◽  
Guided Wave ◽  
S Wave ◽  
Seismic Surveys ◽  
Modeling Data ◽  
Estimation And Filtering

Marine guided waves are strongly dispersive and commonly observed in seismic surveys worldwide in areas of shallow water with a hard seafloor. They are energetic and can obscure deeper reflection signals. We have conducted several ultrasonic physical modeling experiments to observe marine guided waves. The guided-wave dispersion curves from these surveys fit theoretical calculations very well. We next developed a new method to extract the subbottom S-wave velocity and density from water column guided waves using least-squares inversion. We have also developed a dispersion-curve filter, in the velocity-frequency domain, to attenuate the guided waves. We then applied these techniques to the physical modeling data, which have different water depths and different subbottom materials. The extracted results (S-wave velocity, density, and water depth) match the actual values well. The dispersion-domain filter clarifies reflections by attenuating the guided waves, which benefits further processing and interpretation.

Curing Strength Monitoring of Early-Age Concrete Based on Velocity of Guided Wave Using Embedded Plate-Type PZT Sensor Module

2013 ◽  
Vol 281 ◽  
pp. 645-648
Author(s):  
Ju Won Kim ◽  
Eun Seok Shin ◽  
Chang Gil Lee ◽  
Seung Hee Park ◽  
Seo Kinn Hong
Keyword(s):  
Compressive Strength ◽  
Wave Velocity ◽  
Steel Plate ◽  
Piezoelectric Sensor ◽  
Guided Wave ◽  
Early Age ◽  
Monitoring Method ◽  
Sensor Module ◽  
Early Age Concrete ◽  
Plate Type

In this study, a guided wave based nondestructive curing strength monitoring method is proposed to monitor the curing strength of the early-age concrete. This approach used the embedded steel plate-type PZT sensor module which was fabricated by bonding the two pieces of piezoelectric sensor to a steel plate. The steel plate provided the constant path for guided wave propagation and it protected the piezoelectric sensors from impacts and environmental variations. To measure the guided wave signals from the early-age concrete, fabricated sensor modules were landfilled at the same time with concrete placement.While the concrete was curing, guided wave signals were measured by pitch-catch method continuously at regular intervals. Wavelet transform process was performed to improve the quality of the signal by removing the signal’s noise of undesired frequencies. The TOF (Time of flight) of guidedwave was extract from de-noised signal using peak tracing algorithm to calculate the velocity of wave. The calculated wave velocity hysteresis according to the curing time was traced to analysis the pattern of variations of wave velocity. Finally, specific equations to estimate the strength of the concrete were derived using regression analysis based on the wave velocity and compressive strength from destructive compressive strength test.

scholarly journals Stress Sensitivity of the T(0,1) Mode Velocity for Cylindrical Waveguides

2018 ◽  
Vol 774 ◽  
pp. 453-460
Author(s):  
Jabid E. Quiroga Mendez ◽  
Octavio Andrés González-Estrada ◽  
Yesid Rueda Ordonez
Keyword(s):  
Wave Velocity ◽  
Shear Velocity ◽  
Stress Sensitivity ◽  
Guided Wave ◽  
Analytical Models ◽  
Practical Implementation ◽  
Stress Monitoring ◽  
Third Order ◽  
Torsional Mode ◽  
Third Order Elastic Constants

In this paper, the stress influence in the guided wave velocity of the fundamentaltorsional mode is presented. Two analytical models, based on the Acoustoelasticity effect, tocompute the fundamental torsional mode velocity propagating in a specimen subject to anaxial stress are studied. These models are obtained due to the relation between the T(0, 1)guided wave velocity and the bulk shear velocity. The analytical models to calculate the guidedwave velocity are functions of the stress, second and third order elastic constants. A series ofaxial stress levels applied to a cylindrical waveguide is investigated with numerical simulations(Finite Elements) to estimate variations of the T(0, 1) guided wave velocity. This analysisprovides a criterion to evaluate the practical implementation of a stress monitoring schemebased on velocity variations of the fundamental torsional mode.

Estimating the diameter∕thickness of a pipe using the primary wave velocity of a hollow cylindrical guided wave

2004 ◽  
Vol 85 (6) ◽  
pp. 1077-1079 ◽  
Author(s):  
Hideo Nishino ◽  
Mikio Takemoto ◽  
Noriyoshi Chubachi
Keyword(s):  
Wave Velocity ◽  
Guided Wave ◽  
Primary Wave

scholarly journals Strength Development Monitoring of Cemented Paste Backfill Using Guided Waves

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8499
Author(s):  
Wen He ◽  
Changsong Zheng ◽  
Shenhai Li ◽  
Wenfang Shi ◽  
Kui Zhao
Keyword(s):  
Uniaxial Compression ◽  
Wave Velocity ◽  
Guided Waves ◽  
Guided Wave ◽  
Strength Development ◽  
Cemented Paste Backfill ◽  
Curing Time ◽  
Acoustic Parameters ◽  
Paste Backfill ◽  
Wave Technique

The strength of cemented paste backfill (CPB) directly affects mining safety and progress. At present, in-situ backfill strength is obtained by conducting uniaxial compression tests on backfill core samples. At the same time, it is time-consuming, and the integrity of samples cannot be guaranteed. Therefore guided wave technique as a nondestructive inspection method is proposed for the strength development monitoring of cemented paste backfill. In this paper, the acoustic parameters of guided wave propagation in the different cement-tailings ratios (1:4, 1:8) and different curing times (within 42 d) of CPBs were measured. Combined with the uniaxial compression strength of CPB, relationships between CPB strength and the guided wave acoustic parameters were established. Results indicate that with the increase of backfill curing time, the guided wave velocity decreases sharply at first; on the contrary, attenuation of guided waves increases dramatically. Finally, both velocity and attenuation tend to be stable. When the CPB strength increases with curing time, guided wave velocity shows an exponentially decreasing trend, while the guided wave attenuation shows an exponentially increasing trend with the increase of the CPB strength. Based on the relationship curves between CPB strength and guided wave velocity and attenuation, the guided wave technique in monitoring the strength development of CPB proves feasible.

0939 On an Application of Identification Method of Bone Mechanical Property by using CT Images considering Variation to Numerical Analysis

2007 ◽  
Vol 2007.5 (0) ◽  
pp. 179-180
Author(s):  
Takeshi KAWAMURA ◽  
Masaru ZAKO ◽  
Tetsusei KURASHIKI ◽  
Hiroaki NAKAI ◽  
Takafumi FURUTA ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Numerical Analysis ◽  
Ct Images ◽  
Identification Method ◽  
Bone Mechanical Property
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