Two-layer Sheets Research Articles

Linear Temporal Instability of a Two-Layer Axisymmetric Cylindrical Liquid Sheet

The instability of an axial uniform flow of a two-layer axisymmetric cylindrical sheet composed of two inviscid fluids is examined analytically and numerically on the basis of thin-layer approximation. As the eigenmodes for disturbances of large wavelength, we obtain an internal mode in which the displacement of interface between these fluids is larger than the displacements of two free surfaces of the sheet, as well as the modes similar to varicose and sinuous modes in a single-layer case. All the modes are unstable only for disturbances of large wavelength, and the growth rate of sinuous-like mode is much larger than that of two other modes. Furthermore, unlike a single-layer case, the wavenumber of disturbances of maximum growth rate is non-zero if the density ratio is sufficiently far from one. In such cases, the ratio of amplitudes of these disturbances is much different from that in a typical sinuous mode. The dependences of maximum growth rate on the ratios of surface tension coefficients, fluid densities, and sheet thicknesses are also examined.

Analysis of asymmetrical cold and hot bond rolling of unbounded clad sheet under constant shear friction

An analytical model for asymmetrical cold and hot bond rolling of two-layer unbounded clad sheet unbounded before rolling is derived to investigate the stress field using a direct formulation. Constant shear friction between the rolls and the clad sheet is assumed. Due to different roll speeds and roll radii, two neutral points and one bonding point are generated at the roll gap; the plastic deformation regions can be divided into four zones. The neutral points, the rolling pressure distribution, the horizontal stress of the whole clad sheet, the horizontal stresses in the component layers, the shear stress at the interface, the rolling force, and the rolling torque, can be easily and rapidly calculated. The determination of the bonding point and the clad thickness ratio at the exit are of great important. The results obtained from this study have been compared with experiment [Y.M. Huang, T.H. Chen, H.H. Hsu, Analysis of asymmetrical clad sheet rolling by stream function method, Int. J. Mech. Sci. 38 (1996) 443–460] to verify the feasibility of the model.

Novel Double-Stranded Chains vs Two-Layer Interwoven Sheets. Subtle Coligand Effects and Related Properties for [Co(Py2S)2X2]n (Py2S = 4,4‘-Dipyridyl Sulfide; X = NCS, Cl)

A study of striking structural differences in the magic angle of Py2S and coligand effects has been carried out. [Co(Py2S)2Cl2]n is the first integral two-layer interwoven sheet without any counter...

Numerical Investigation of Forming Limit of Sheet Metals due to Shear Band Localization. 2nd Report. Forming Limit Strain of Bonded Sheet Metals.

By the use of a similar numerical method as that in the previous paper, the forming limit strain of bonded sheet metals is investigated, in which the FEM is applied and J2G (J2-Gotoh's corner theory) is utilized as the plasticity constitutive equation. Bonded two-layer sheets and sheets bonded with dissimilar sheets on both surface planes are stretched in a plane-strain state, with various work-hardening exponent n-values and thicknesses of each layer. Processes of shear-band formation in such composite sheets are clearly illustrated. It is concluded that, in the bonded state, the higher limiting strain of one layer is reduced due to the lower limiting strain of the other layer and vice versa, and does not necessarily obey the rule of linear combination of the limiting strain of each layer weighted according thickness.

積層複合板材の塑性変形特性とプレス加工

積層複合板材の塑性変形特性とプレス加工

A new interpretation of the structure of disordered α-cristobalite

Disordered α-cristobalite which occurs extensively in bentonites, opals and particularly deep-sea cherts, has been previously interpreted in terms of a unidimensionally disordered structure in which cristobalite is interstratified with two-layer tridymite-like sheets. An alternative interpretation is that the structure is essentially tridymitic but that the sheets are stacked with random transverse displacement normal to the c axis, an arrangement similar to the translational, turbostratic stacking postulated for smectites. This interpretation was arrived at after a comparitive study of a silica phase in an Italian bentonite and a deep-sea chert, material which yielded an X-ray powder pattern almost identical with that of disordered α-cristobalite, but electron diffraction patterns and infrared spectra more consistent with tridymite. It is suggested that this type of silica, which has been described almost universally as cristobalite, is more appropriately referred to as disordered α-tridymite.

Two-layer sheets with a cladding made from the alloy �P-567

Two-layer sheets with a cladding made from the alloy �P-567

Automatic submerged-arc welding of two-layer clad sheet steel St. 3 + 0Kh23N28M3D3T

Automatic submerged-arc welding of two-layer clad sheet steel St. 3 + 0Kh23N28M3D3T

Welding of chemical equipment made from two-layer sheet with titanium protective layer (review of foreign literature)

Welding of chemical equipment made from two-layer sheet with titanium protective layer (review of foreign literature)

Workability by pressure of the two-layer sheet St. 3 steel + NP-2 nickel

Workability by pressure of the two-layer sheet St. 3 steel + NP-2 nickel