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[en] A grinder for volume reduction of contaminated small containers is described. The design allows remote handling and easy dismanthing for cleaning or blade change
[fr]On decrit un broyeur permettant de reduire le volume des petits recipients contamines en vue de leur stockage. Ce broyeur est telemanipulable est facile a demonter
[en] In the continuation of the research work by BAM and the Commissariat a l'Energie Atomique (CEA), France, a study was made of the increased risk in regard to low-probability accidents, involving small, type B packages. An evaluation was made of the increased risk when small, type B packages are involved with a low-probability accident - one that involves both crush forces and exposure to a hydrocarbon fire. 3 references, 3 figures
[en] The test series described in this paper has shown that the proposed dynamic crush test or the alternate static crush test result in significantly greater packaging deformation than occurs when the regulatory 9 meter drop test is performed on lightweight, low density, Type B packagings. Furthermore, when the test results from the current program are compared with test results from an accident simulating test of a truck/trailer system carrying such lightweight packagings, the proposed dynamic crush test or the alternate static crush test both appear to provide a crush environment similar to that which can be expected in transport accidents, whereas the 9 meter drop test does not appear to simulate this environment. The energy absorbed by the packaging under the proposed dynamic crush test is independent of the packaging mass and can be significantly greater than the energy the packaging must absorb during a 9 meter drop test. The deformations produced in the 310 kN static crush test and the proposed dynamic crush test are very similar, and are generally greater than those experienced in the 9 meter drop test. The outer drum lid of the generic designs opened under these conditions, at times exposing the inner container. Such damage could lead to increased heating of the inner container during the following thermal test prescribed by regulations
[en] An industrial plant, situated in Niger, is described. This plant allows the crushing of 1500 metric tons of uranium per year in uranate form
[fr]On decrit une installation industrielle de broyage autogene, situee au Niger qui permet de traiter 1500 tonnes d'uranium par an sous forme d'uranate
[en] Many research studies have been conducted on the liberation of locked minerals using a crusher and comparing this device with the other devices. This paper reviews the liberation of middle coal by different methods of crushing force. In the Tabas coal washing plant, particles of 0.5-50 mm size are processed through the heavy media method (using 3 Tri-flo separators) and particles of 0-0.5 mm size are processed using the flotation method (using 6 column flotation cells). A Tri-flo separator with a diameter of 700 mm and the capacity of 120 tons per hour is used for the cleaning of 6-50 mm raw coal particles. The study was conducted using a laboratory jaw crusher and a cage mill with a specific comminution ratio, both crushing forces were analyzed with the same distribution and mechanism of production of fines. In this study, grading and washability characteristics of a representative sample of middle product were reviewed and the dimensions of the ash were measured for each section. Intermediate product crushing using a laboratory jaw crusher and an industrial cage mill were conducted at up to 5 mm size and 50 percent of final speed. The amount of coal released after each section grading was determined by a sinking and floating test for size +0.5 mm and release analysis and ash testing for smaller dimensions of -0.5, these tests were conducted for each section product dimension. The results indicated that utilizing a cage mill is more effective than a laboratory jaw crusher, resulting in 11-percent more yield with 12 ash. The rate of fines produced through the laboratory jaw crusher is less than the industrial cage mill.
[en] Highlights: • Novel lightweight sandwich structures with the bio-inspired double-sine corrugated cores are proposed. • The new constructions are capable of reducing the initial peak force dramatically. • The double-sine corrugated core enhances the energy absorption capacity of the sandwich structures. • Specific energy absorption is highly dependent on the wave number and wave amplitude of the double-sine corrugated core. The concept of mimicking natural materials to design novel lightweight structures with high capacity of energy absorption is of great interest at present. Enormous natural structures exhibit fascinating mechanical performance after hundreds of millions of years of convergent evolution. Odontodactylus scyllarus, known as the peacock mantis shrimp, whose dactyl strike is recognized as one of the rapidest and powerful creatures found in nature, has an enormous potential to act as excellent biomimetic protective system. In this paper, a novel lightweight bio-inspired double-sine corrugated (DSC) sandwich structure has been proposed to enhance the impact resistance. The out-of-plane uniform compression of the bio-inspired bi-directionally sinusoidal corrugated core sandwich panel has been conducted under the quasi-static crushing load. Compared with the regular triangular and sinusoidal corrugated core sandwich panels, the bio-inspired DSC core sandwich panels significantly improve the structural crashworthiness as well as reducing the initial peak force greatly. Finally, the influences of the wave amplitude, wave number and corrugated core layer thickness on the mechanical performance of the bio-inspired DSC core sandwich panel are investigated to seek for the appropriate structural parameters to optimize the energy absorption behavior.
[en] In this paper, we focus mainly on evaluating the anisotropy evolution in Zircaloy-4 tubes with respect to hydrogen pickup which tends to affect the deformation behavior and fracture elongation due to embrittlement phenomenon induced by Zr hydrides. To capture the complex material behaviors of the H-charged (166 ppm) Zircaloy-4 tubes, we have applied the Hill anisotropic yield criterion by carrying out several material tests, such as the axial tensile, ring tensile, and axial crushing tests, for calibrating the anisotropic coefficients based on the directional strength and strain ratios. It makes possible to simulate the directional flow curves of the as-received and the H-charged Zircaloy-4 tubes based on the directional strength ratios along the axial and hoop directions, respectively, as well as a variation in deformation modes in the axial crushing test with substantial accuracy.