A flexible numerical approach for non-destructive ultrasonic testing based on a time-domain spectral-element method: Ultrasonic modeling of Lamb waves in immersed defective structures and of bulk waves in damaged anisotropic materials

Rosenkrantz, Eric; Bottero, Alexis; Komatitsch, Dimitri; Monteiller, Vadim

doi:10.1016/j.ndteint.2018.10.002

Cited by 20 publications

(11 citation statements)

References 77 publications

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“…Compared with those of eastern and southeast Asian heritage, the incidence among Caucasians is lower: the incidence in China is about 0.1-0.6%, and the incidence in the United States is about 0.1%. Besides, the incidence of congenital hip dysplasia is higher on the left side than on the right (12,13). Among participants with congenital hip dysplasia in this study, the left side was the most commonly affected, with an incidence of 6.02%, which was basically consistent with the reports of the above-mentioned literatures.…”

Section: Congenital Hip Dysplasia Is a Common Limb Deformity Insupporting

confidence: 91%

The feasibility of ultrasound Graf method in screening infants and young children with congenital hip dysplasia and follow-up of treatment effect

Liu

Mou

Yu³

et al. 2021

Transl Pediatr

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Background: Congenital hip dysplasia is a common limb deformity in infants and young children. This study aimed to clarify the feasibility of ultrasound Graf method in screening congenital hip dysplasia of infants and young children, and its application value in follow-up treatment.Methods: A total of 1,313 infants and young children with clinically suspected congenital hip dysplasia in our hospital from December 2016 to January 2018 were selected as the participants and were examined by ultrasound Graf method. The acetabulum shape and the measured values of α and β angles of the participants were observed. The development of the hip joint and distribution of congenital hip dysplasia were analyzed, and the treatment effect was followed up.Results: Among 1,313 infants and young children with suspected congenital hip dysplasia, the positive rate of congenital hip dysplasia was 6.02% (79/1,313). The lesions were located on both sides in 14 cases, on the left side in 67 cases, and on the right side in 26 cases. The α angle of cases with congenital hip dysplasia was significantly lower than that of normal cases, and the β angle was significantly higher than that of normal cases (P<0.05). Ultrasound follow-up results showed that out of 24 cases who underwent hip abduction exercises, 22 (91.67%) returned to normal, and the remaining 2 returned to normal after Pavlik sling treatment. Among 46 cases treated with Pavlik sling, 42 (91.30%) returned to normal, and the remaining 4 cases returned to normal after closed reduction and plaster fixation. A total of 9 participants underwent plaster fixation after closed reduction, all of which returned to normal.Conclusions: Ultrasound Graf method can be used as the first choice for screening infants and young children with congenital hip dysplasia. It can be followed up to observe the clinical treatment effect, and it has high clinical application value.

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Section: Congenital Hip Dysplasia Is a Common Limb Deformity Insupporting

confidence: 91%

The feasibility of ultrasound Graf method in screening infants and young children with congenital hip dysplasia and follow-up of treatment effect

Liu

Mou

Yu³

et al. 2021

Transl Pediatr

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“…These coecients are shown in Figures 4 and 5 as the function of the incidence angle with respect to the normal to the surface. They were obtained numerically from parametric simulations (see Rosenkrantz et al, 2019). These coecients take into account the two viscoelastic crustal interfaces: the transmission between the semi-innite bottom and the dierent sediment congurations given in Table 1 and the reection between the water medium (here considered as semi-innite) and the sediments.…”

Section: Label Used Descriptionmentioning

confidence: 99%

On the Influence of Slopes, Source, Seabed and Water Column Properties on T Waves: Generation at Shore

Bottero

Cristini

Komatitsch

2020

Pure Appl. Geophys.

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The term T waves is generally associated with acoustic waves generated by seismic events that subsequently travel horizontally in the ocean at the speed of sound. In this paper, we use a time-domain spectral-element method to perform a parametric study of the inuence of seaoor slope, source position and media properties for a typical (downslope) T-wave generation scenario.We nd that the energy and duration of these waves are particularly sensitive to the environment. In particular, the slopes and physical characteristics of the seabed play a crucial role for both the generation and the conversion of these waves. Likewise, the depth and position of the earthquake relative to the slope is of great importance, with the presence of privileged areas for the generation of T waves, which we map.

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“…A practical example of the methodology proposed in this work can be found in [90,91] for calculating small scale parameters which are related to different factors at an atomic level of nano-scaled materials. A consistency check of the proposed formulation was proposed in [92] to predict the material properties of nanocomposites, while comparing the theoretical results in terms of wave propagation with the experimental predictions based on some non-destructive tests.…”

Section: Theory and Formulationmentioning

confidence: 99%

Wave Propagation of Porous Nanoshells

et al. 2018

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This study aims at investigating the wave propagation of porous nanoshells. The Bi-Helmholtz non-local strain gradient theory is employed in conjunction with a higher-order shear deformation shell theory, in order to include the size-dependent effects. The nanoshells are made of a porous functionally graded material (P-FGM), whose properties vary continuously along the thickness direction. A variational approach is here applied to handle the governing equations of the problem, which are solved analytically to compute the wave frequencies and phase velocities as function of the wave numbers. The sensitivity of the wave response is analyzed for a varying porosity volume fraction, material properties, non-local parameters, strain gradient length scales, temperature, humidity, and wave numbers. Based on the results, it is verified that the size-dependence of the response is almost the same to the one of plates, beams and tubes.

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A flexible numerical approach for non-destructive ultrasonic testing based on a time-domain spectral-element method: Ultrasonic modeling of Lamb waves in immersed defective structures and of bulk waves in damaged anisotropic materials

Cited by 20 publications

References 77 publications

The feasibility of ultrasound Graf method in screening infants and young children with congenital hip dysplasia and follow-up of treatment effect

The feasibility of ultrasound Graf method in screening infants and young children with congenital hip dysplasia and follow-up of treatment effect

On the Influence of Slopes, Source, Seabed and Water Column Properties on T Waves: Generation at Shore

Wave Propagation of Porous Nanoshells

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