Assessment of metal strand wire pre-stress in anchor head by ultrasonics

Kleitsa, D.; Kawai, Kosuke; Shiotani, Tomoki; Aggelis, Dimitrios G.

doi:10.1016/j.ndteint.2010.05.011

Cited by 10 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the frequency of 1 MHz (period of 1 ms) more than 30 elements were used to describe the wave, with a stable time increment of 0.0712 ms. For the frequency of 5 MHz (period of 0.2 ms) the time step was 0.0555 ms still sufficing the requirement of at least 10 elements/wave length, while the wavelength was 1.2 mm, being 10 times longer than the mesh size, which is considered a minimum value to be respected so that the numerical presentation of the wave should be correct. 18,19 The used material in this simulation is considered as linear-elastic, homogeneous, and isotropic. Boundary conditions were assumed as symmetry on (xz) plan and (yz).…”

Section: Elastic Wave Simulationmentioning

confidence: 99%

Ultrasonic wave simulation in shrink-fit assembly for the estimation of stress at the contact interference

Belmessous,

Boutoutaou

2024

Advances in Mechanical Engineering

View full text Add to dashboard Cite

The investigation of stress distribution in an interference fit contact region is essential information required in fatigue and wear calculations to determine design life, regrinding requirements, and maintenance schedules. The aim of this work was to use ultrasound to non-destructively determine stress in the shrink-fit assembly, with the acoustoelastic theory. This one is based on the dependence of the propagation velocity of the ultrasonic wave with the stress state in the material. When a material is subjected to stress, there is a variation of the propagation velocity of the ultrasonic wave. Three methods have been initiated to ensure that the results will be more real, the first is the analytical calculation using thick-walled cylinder theory and Lamé formulation, then a numerical modeling of the contact between the assembled parts using finite element analysis and the third one is using elastic wave simulation and acoustoelastic theory in order to determine the value of the stress distribution at the interference region.

show abstract

Section: Elastic Wave Simulationmentioning

confidence: 99%

Ultrasonic wave simulation in shrink-fit assembly for the estimation of stress at the contact interference

Belmessous,

Boutoutaou

2024

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…As already mentioned, the interphase obtained different values of stiffness expressed by the corresponding longitudinal wave velocities. This is a key parameter of the study and a practical way to simulate different contact levels between the matrix material and the fiber [11, 15]. Specifically, the lowest value was 300 m/s (case of loose interphase similar to air), and the maximum 11770 m/s which is the longitudinal wave velocity of the fiber.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…The diameter of the fiber is 142 μ m, and it is embedded 100 μ m below the surface, (see Figure 2). Since there was no physical insight for the thickness of the actual interphase layer, it was set to 50 μ m. In similar cases, it has been shown that the thickness of the interphase does not make critical difference in the results [11]. The vertical distance of the pulser was indicatively set to 1 mm above the surface of the specimen, while it can be adjusted to suit the relevant experimental geometry each time.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…The number of reflections recorded by the sensor and their delay define the possible defects and their depth below the surface of the tested object. In the specific case described herein, the direction of the pulse relatively to the materials' surface is dictated by the shear critical angle so that only shear waves propagate in the medium, which are arguably more sensitive to the existence and quality of interphases [8, 11, 12]. The shear wave interacts with the embedded fiber and the reflection is eventually recorded by the receiver.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrasonic Characterization of the Fiber‐Matrix Interfacial Bond in Aerospace Composites

Aggelis

Kleitsa

Matikas

2013

The Scientific World Journal

Self Cite

View full text Add to dashboard Cite

The properties of advanced composites rely on the quality of the fiber-matrix bonding. Service-induced damage results in deterioration of bonding quality, seriously compromising the load-bearing capacity of the structure. While traditional methods to assess bonding are destructive, herein a nondestructive methodology based on shear wave reflection is numerically investigated. Reflection relies on the bonding quality and results in discernable changes in the received waveform. The key element is the “interphase” model material with varying stiffness. The study is an example of how computational methods enhance the understanding of delicate features concerning the nondestructive evaluation of materials used in advanced structures.

show abstract

“…Detecting prestress near the anchor head may indicate any potential loss in prestress. Kleitsa et al [15] demonstrated that the propagation time and amplitude of ultrasonic waves can provide insight into changes in contact pressure between the steel strand and the anchor head.…”

Section: Introductionmentioning

confidence: 99%

A PZT-Based Smart Anchor Washer for Monitoring Prestressing Force Based on the Wavelet Packet Analysis Method

Wang,

Zhang,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

Prestressed steel strands in prestressed structures offset or reduce the tensile stress caused by external loads, making them the primary load-bearing components. Great concerns have been raised about prestress monitoring due to the growing use of structural health monitoring (SHM). Piezoceramic (PZT) active sensing methods are commonly used in this field. However, there appears to be a problem of “energy saturation” in the utilization of piezoceramic active sensing methods. In this study, a smart anchor washer with semi-cylinders was developed to alleviate the saturation problem. An intelligent monitoring system is formed by combining the upper and lower annular cylinders with two piezoelectric patches. The piezoelectric patch on the upper annular cylinder is used as an actuator to emit signals through the contact interface of the smart anchor washer, which are then received by the piezoelectric patch on the lower annular cylinder. Based on wavelet packet decomposition, we investigate the correlation between the energy of the received signal and the applied tension force. Finally, a prestressing force index is developed for monitoring prestressing force using Shannon entropy. It is found that the index decreases with the increase in tension. The proposed design and index are also sensitive to early monitoring of prestressing force and can be used to monitor the entire prestressing process of steel strands.

show abstract

Assessment of metal strand wire pre-stress in anchor head by ultrasonics

Cited by 10 publications

References 10 publications

Ultrasonic wave simulation in shrink-fit assembly for the estimation of stress at the contact interference

Ultrasonic wave simulation in shrink-fit assembly for the estimation of stress at the contact interference

Ultrasonic Characterization of the Fiber‐Matrix Interfacial Bond in Aerospace Composites

A PZT-Based Smart Anchor Washer for Monitoring Prestressing Force Based on the Wavelet Packet Analysis Method

Contact Info

Product

Resources

About