Materials Literature
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Taylor tests have been performed on specimens of ten metallic materials. The different one - dimensional models have been used. In the next step the finite element code LS DYNA has been used in order to deduce the parameters in the Johnson - Cook constitutive equations Using of the mutual comparison of the computed sp…
It is well known that the properties of the materials may be different as the strain rate increases. Advanced ceramic materials such as aluminas, could present an increase in their strength as the strain rate becomes higher. In this paper the investigation is focused on the influence of the strain rate on the tensile…
Neointima formed quickly on vascular prostheses implanted in young dogs but not in aged dogs. Previously, we found that impeding neointima formation on vascular prostheses occurred more frequently in aged animals. From these observations, we hypothesized that neointima formation was age-dependent in dogs. To test the…
The Cotton-Mouton constants for three homologous series of liquid crystals were measured in the isotropic phase. Some of these measurements were performed with high temperature resolution. The results are compared with theories on pretransitional phenomena. The Landau-de Gennes theory proves to be inadequate to descri…
Three different relaxor ferroelectrics, 0.65PMN-0.35PT, Sr 0.61 Ba 0.39 Nb 2 O 6 (SBN), and Pb 0.85 La 0.1 Zr 0.65 Ti 0.35 O 3 have been studied by Brillouin scattering using a microscope with a focal point of 1–2 µm. Relaxation modes have been directly observed for the first time for all three samples. They form at a…
Abstract The interactions between glycine and two Na-, Ca- and Cu-exchanged smectites with different layer-charge location were studied. The sorption of glycine depends on the nature of the interlayer cations (Ca < Na < Cu), and on the type of smectite. Sequential extraction procedures were carried out in order…
The Raman spectra of monoclinic ZnWO4 (c4 2h-space group) are reported over wide ranges of pressure (0-24GPa) and temperature (13-970 K). All 18 Raman active pho-nons are observed throughout these ranges. Combining the pressure and temperature Raman data, an identification scheme is suggested which makes possible to d…
For thin block copolymer (BCP) films on a homogeneous substrate, a fast domain growth exponent has recently been observed in experiments. This growth exponent is larger than what one would expect from theoretical considerations of two-dimensional coarsening of small molecular liquid mixtures in the viscous regime. Thu…
Abstract Emulsion styrene—butadiene rubber (ESBR) has been the workhorse of the tire industry since World War II. With the development of solution polymers, ESBR has seen a steady decrease in its use in tire applications. A novel ESBR has been developed which imparts some of the rheological behavior previously only ob…
The elastic properties of single‐crystalline erbia (Er 2 O 3 ) at room temperature have been investigated using resonant ultrasound spectroscopy. The three independent stiffness constants of anisotropic Er 2 O 3 cubic type‐C crystals have been measured. The values of the stiffness constants were c 11 = 256.4 GPa, c 12…
In this study, the rod-on-rod impact geometry was used at impact speeds of ca. 200 m s -1 . This is widely believed to be equivalent to the impact of a single rod on an infinitely rigid target and hence an ideal form of the Taylor test as no real target is infinitely rigid. However, our modelling studies showed that t…
In order to achieve incipient and complete spallation, plane impact experiments were performed on three types of copper with different impurity levels. Dependence of the damage behavior on the material microstructure was found. The VISAR results of these experiments were used to examine the NAG model of Curran et al […
Abstract Nanospherical MCM-41 silica has been hydrothermally synthesized for the first time in the sodium hydroxide medium with low surfactant concentration. The average size of the nanosphere is about 105 nm.
Tensile and compression tests have been performed on specimens of steels 30CrNiMo8 and 25CrMo4 at strain rates from quasi-static to high strain rates up to ∼5x10 3 s -1 . The flow stress under tensile loading shows a different behaviour than that under compression. Constitutive equations are developed to describe the…
Electric field induced second harmonic generation (EFISH) is a well-known technique to measure the first hyperpolarizability (β) of organic molecules in solution. The characteristic experimental output is observation of oscillatory fringes of second harmonic radiation as the solution path length is changed and evaluat…
The importance of nonexchangeable NH 4 as a potential source of plant‐available N is widely recognized. However, quantitative determination of nonexchangeable NH 4 in soils poses a challenging analytical problem. The use of the KOBr pretreatment in the methods currently used to determine nonexchangeable NH 4 in soils…
The crystal structure of namibite, Cu(BiO) 2 VO 4 (OH) [triclinic, space group P1̄, a = 6.210(1), b = 7.398(1), c = 7.471(1) Å, α = 90.10(1), β = 108.73(1), γ = 107.47(1)°, V = 308.22(8) Å 3 , Z = 2] was determined using single-crystal X-ray diffraction data. The refinement, based on 2140 unique reflections with F o &…
Abstract The crystallization kinetics of virgin and nucleated polyamide 66 was investigated in non‐isothermal and isothermal conditions, by use of DSC and high pressure dilatometry. In non‐isothermal conditions, at atmospheric pressure, the results were first analyzed using the Ozawa equation, leading to an Avrami exp…
Heteroepitaxial BaTiO 3 thin films with lattice-misfit strain were prepared on SrRuO 3 /SrTiO 3 substrates by rf magnetron sputtering under high gas pressure, in order to realize large area deposi-tion with uniform ferroelectric properties. Lattice constants, composition and ferroelectric properties of the epitaxial B…
Bismuth silicate (Bi 2 SiO 5 ) films, expected as the intermediate buffer layer between the bismuth layer-structured ferroelectrics (BLSF) and silicon substrate, were prepared on (100)-oriented silicon wafers by rf magnetron sputtering. The c -axis-oriented Bi 2 SiO 5 films with smooth surface morphology were obtained…