scholarly journals Solution of Acoustic Tomographic Problems on the Basis of Numerical Simulation of Particle Dynamics

2018 ◽  
Vol 155 ◽  
pp. 01019
Author(s):  
Angela Kuzovova ◽  
Ivan Kuzmenko
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Wave Propagation ◽  
Continuous Media ◽  
Particle Dynamics ◽  
Direct Wave ◽  
Backward Wave ◽  
Propagation Of Waves ◽  
Backward Propagation

A method is proposed for imaging of scattering heterogeneities in continuous media on the basis of numerical modeling of forward and backward wave propagation. It is shown that the combination of a solution for backward propagation of waves and direct wave propagation allows us to visualize scattering heterogeneities. The results of numerical simulation are presented.

scholarly journals Numerical modeling of anisotropic properties of a solid by particle dynamics method

2021 ◽  
Vol 2140 (1) ◽  
pp. 012018
Author(s):  
D Ya Sukhanov ◽  
A E Kuzovova
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Crystal Lattice ◽  
Longitudinal Wave ◽  
Wave Velocity ◽  
Solid Body ◽  
Particle Dynamics ◽  
Longitudinal Wave Velocity ◽  
Anisotropic Properties ◽  
Dynamics Method

Abstract A method is proposed for the numerical simulation of acoustic processes in solids based on the particle dynamics approach for describing the anisotropic properties of a solid. It is proposed to consider a solid body in the form of an array of particles located in a cubic body-centered crystal lattice. To set the anisotropic properties of a solid, it is proposed to use its own proportionality force to shift coefficient for each direction. Based on the results of numerical simulation, the dependence of the longitudinal wave velocity on the direction is shown.

scholarly journals Study on X-ray Induced Two-Dimensional Thermal Shock Waves in Carbon/Phenolic

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3553
Author(s):  
Dengwang Wang ◽  
Yong Gao ◽  
Sheng Wang ◽  
Jie Wang ◽  
Haipeng Li
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Wave Propagation ◽  
Thermal Shock ◽  
Anisotropic Material ◽  
Energy Deposition ◽  
X Rays ◽  
Two Dimensional ◽  
X Ray ◽  
Deposition Depth

Carbon/Phenolic (C/P), a typical anisotropic material, is an important component of aerospace and often used to protect the thermodynamic effects of strong X-ray radiation. In this paper, we establish the anisotropic elastic-plastic constitutive model, which is embedded in the in-house code “RAMA” to simulate a two-dimensional thermal shock wave induced by X-ray. Then, we compare the numerical simulation results with the thermal shock wave stress generated by the same strong current electron beam via experiment to verify the correctness of the numerical simulation. Subsequently, we discuss and analyze the rules of thermal shock wave propagation in C/P material by further numerical simulation. The results reveal that the thermal shock wave represents different shapes and mechanisms by the radiation of 1 keV and 3 keV X-rays. The vaporization recoil phenomenon appears as a compression wave under 1 keV X-ray irradiation, and X-ray penetration is caused by thermal deformation under 3 keV X-ray irradiation. The thermal shock wave propagation exhibits two-dimensional characteristics, the energy deposition of 1 keV and 3 keV both decays exponentially, the energy deposition of 1 keV-peak soft X-ray is high, and the deposition depth is shallow, while the energy deposition of 3 keV-peak hard X-ray is low, and the deposition depth is deep. RAMA can successfully realize two-dimensional orthotropic elastoplastic constitutive relation, the corresponding program was designed and checked, and the calculation results for inspection are consistent with the theory. This study has great significance in the evaluation of anisotropic material protection under the radiation of intense X-rays.

Numerical modeling of wave propagation in functionally graded materials using time-domain spectral Chebyshev elements

2014 ◽  
Vol 258 ◽  
pp. 381-404 ◽  
Author(s):  
Saeid Hedayatrasa ◽  
Tinh Quoc Bui ◽  
Chuanzeng Zhang ◽  
Chee Wah Lim
Keyword(s):  
Numerical Modeling ◽  
Wave Propagation ◽  
Functionally Graded Materials ◽  
Time Domain ◽  
Functionally Graded ◽  
Graded Materials

Numerical Simulation of Shock Wave Propagation in Porous Targets

2003 ◽  
Vol 29 (1-10) ◽  
pp. 639-645 ◽  
Author(s):  
Valery V. Shuvalov
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Wave Propagation ◽  
Shock Wave Propagation
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