Simulation of the process of wave formation in explosive welding

Deribas, A. A.; Kudinov, V. M.; Matveenkov, F. I.; Simonov, V. A.

doi:10.1007/bf00843076

Cited by 11 publications

(4 citation statements)

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“…which shows that the wave amplitude depends only weakly on the contact-point velocity v c if v c ≈ v cr , because in this case γ ≈ 0, which agrees with the experimental data of [2] and empirical formula (1), where such a dependence is simply ignored. The theory predicts that further evolution of wave formation with increasing contact-point velocity has to yield a more complicated shape of the impact boundary (the initial shape close to sinusoidal is strongly distorted by vortex zones), because, in addition to oscillations with the frequency ω, oscillations with different frequencies are excited as the Reynolds number increases, in complete agreement with experimental data.…”

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confidence: 82%

“…The main criterion of reliability of this or that model was assumed to be good agreement between the theoretically predicted dependence of the wave size on the impact angle and the experimental curve. Comparisons of theoretical predictions were performed with the empirical relations λ = Aδ sin 2 (ϕ/2), a/λ ≈ 0.25 (1) (λ is the wave length, a is its amplitude, δ is the thickness of the impacting plates, and ϕ is the impact angle) with a coefficient A = 16-26 obtained in experiments of various authors [2][3][4]. It turned out that, with a proper choice of the yield point and coefficients of viscosity, surface tension, elasticity, etc., all models provide good agreement with Eq.…”

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confidence: 99%

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Wave formation in a high-velocity symmetric impact of metal plates

Пай

Luk’yanov

Kuz'min

et al. 2006

Combust Explos Shock Waves

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The impact of metal plates is considered within the framework of the model of a viscous incompressible fluid. The beginning of the wave-formation process in the model is equivalent to the initial stage of origination of instability of a steady flow in Landau's scenario. To establish the correspondence between the model and the real process, a series of experiments is performed on a symmetric impact of plates made of an aluminum alloy with identical impact angles and different velocities of the contact point. At high values of the Reynolds number and, hence, at high velocities of the contact point, wave excitation is shown to have a soft character; at lower values of Reynolds number, there exists a metastability region where the wave-excitation regime is rather hard; at even lower Reynolds numbers, no action can lead to wave formation, as it follows from the theory. Thus, Landau's model of origination of instability of a steady fluid flow is found to agree with the process of wave formation in an oblique impact of metal plates.The wave-formation process in explosive welding of metals is considered in many papers; a brief list of these papers can be found in [1]. At least 15 various models of the process have been proposed. The difference in mechanisms believed to be responsible for this phenomenon is rather large. Thus, for instance, the fluid medium in some models is considered either as an ideal fluid or as a fluid possessing some real physical properties, such as viscosity, surface tension, and compressibility. Other models take into account elastic and strength properties of the medium. The main criterion of reliability of this or that model was assumed to be good agreement between the theoretically predicted dependence of the wave size on the impact angle and the experimental curve. Comparisons of theoretical predictions were performed with the empirical relations λ = Aδ sin 2 (ϕ/2), a/λ ≈ 0.25(1)

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confidence: 82%

mentioning

confidence: 99%

Wave formation in a high-velocity symmetric impact of metal plates

Пай

Luk’yanov

Kuz'min

et al. 2006

Combust Explos Shock Waves

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“…Wittman et al illustrated the relationship between β and V p from the equation (1) [30]. At the same time, Deribas [31] gave the empirical formula (equation (2)) for wavelength λ, which is a function of thickness of flyer h 1 and β. Combining equations (1)), it can be obtained that the λ is affected by the V p when the h 1 and explosive detonation velocity V d is determined as a constants in the process of welding, as shown in equation (3).…”

Section: The Relationship Between Dimension Of Wave and Collision Velmentioning

confidence: 99%

A dynamic study of effect of multiple parameters on interface characteristic in double-vertical explosive welding

Sun

Shi

Fang

et al. 2020

Mater. Res. Express

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Previous studies focused on the research of single parameters on the bonding quality of explosive welded composite plates. To explore the dynamic influence of multiple parameters on the interface, a VST (velocity, stand-off gap and charge thickness) function was proposed. The three-dimensional diagram clearly and intuitively showed that the collision velocity was comprehensively affected by the explosive thickness and stand-off gap. Four different sets of parameters were chosen and the composite plates were successfully manufactured in the experiment of double vertical explosive welding (DVEW). The interface morphology, element distribution and the mechanical property were discussed respectively. The optical microscope showed that all the samples were wavy interface but the dimensions of the ripples was different. The defects, such as melting layer and island region, appeared less frequently at bonding interface when the collision velocity was lower. The grain refinement, adiabatic shear bands were found at the crest and side of wave respectively. The width of elements diffusion layer of joint increased in line with higher collision velocity. It was indicated the maximum microhardness reached 293HV at the bonding interface due to work hardening. Shear and tensile tests suggested the the mechanical property of large wave was better than that of small wavy interface. The fracture morphology showed obvious stratification and the dimple at the bonding interface was smaller in diameter and less plastic.

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“…The problem of the explanation of the origin of waves and vortices upon explosion welding of metals was analyzed in many works [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In the special lit erature, the model of the formation of waves and vor tices presented by Bahrani et al [5] is frequently cited.…”

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confidence: 99%

Formation and structure of vortex zones arising upon explosion welding of carbon steels

Батаев

Mali

et al. 2012

Phys. Metals Metallogr.

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Presented are the results of investigation of vortex zones arising upon explosion welding of thin plates of steel 20. Specific features of the structure of the vortices and zones of the deformed material adjacent to them have been revealed by methods of structure analysis. It has been shown that in the process of explosive loading the central regions of the vortices characterized by an enhanced carbon content were in the molten state. The microhardness in the region of vortex zones reaches 5700 MPa. The character of the arrangement of ferrite grains and martensite microvolumes in peripheral regions of vortices is caused by intense rotation of the material. The intense intermixing of materials in different states of aggregation in vortex zones is one of the factors responsible for the formation of cavities, whose volume exceeds the volume shrinkage occurring upon casting of carbon steels. It has been established that traces of vortex zones are retained even after one hour annealing of welded packets at 800°C.

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Simulation of the process of wave formation in explosive welding

Cited by 11 publications

References 0 publications

Wave formation in a high-velocity symmetric impact of metal plates

Wave formation in a high-velocity symmetric impact of metal plates

A dynamic study of effect of multiple parameters on interface characteristic in double-vertical explosive welding

Formation and structure of vortex zones arising upon explosion welding of carbon steels

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