As an advanced heat exchanger for aero-turbine applications, a tubular-type was developed. To ensure the optimum performance of exchanger, it is necessary to assess structural integrity tubes, considering assembly processes such as brazing. In this study, fatigue tests at room temperature and 1000 K were performed 0.135 mm-thick alloy 625 tubes (outer diameter 1.5 mm), which brazed grip specime...

The fluid-structure interaction simulation of detonationand shock-wave-loaded fracturing thin-walled structures requires numerical methods that can cope with large deformations as well as topology changes. We present a robust level-set-based approach that integrates a Lagrangian thin shell finite element solver with fracture and fragmentation capabilities with an Eulerian Cartesian detonation s...

We study orbits in potentials with central cusps, emphasizing the spheroidal equidensity (SED) potentials generated by mass distributions with spheroidal equidensity surfaces. The most prominent bifurcations are those related to 1:1 and 4:3 resonances between radial motions and motions perpendicular to the central plane. We find that 1:1 resonances can cause the thin tube orbit, as well as the ...

The processes of silver diffusion into thin-film structures (As2S3)0,995Sn0,005 under the X-ray radiation were studied. Thin-film layers silver, about 12 nm thick, deposited by vacuum thermal evaporation on surface. thin layer irradiated with in range absorbed doses 0,3-0,6 Gy using tube a copper anode (voltage 45 kV, current 40 mA) as an source without any filters (the continuous spectrum X-ra...

Many experiments in biomedical applications and other disciplines use a shock tube. These experiments often involve placing an experimental sample within a fluid-filled container, which is then placed inside the shock tube. The shock tube produces an initial shock that propagates through gas before hitting the container with the sample. In order to gain insight into the shock dynamics that is h...

The tubed vortex reducer in the axial compressor can destroy disk cavity, by a thin-walled tube, to reduce total pressure loss. tube may suffer from vibration problems, such as flutter and forced vibration, which are closely related aerodynamic damping. In this paper, energy method influence coefficient used study damping of tube. Based on modal characteristics, steady unsteady flow characteris...

We consider an astrophysical system with a population of sources and a population of lenses. For each pair of source and lens, there is a thin on-axis tube-like volume behind the lens in which the radiation flux from the source is greatly increased due to gravitational lensing. Any objects (such as dust grains) which pass through such a thin tube will experience strong bursts of radiation, i.e....

this research deals with axial and oblique impact crash tests on simple and hybrid composite tubes. axial and oblique impact tests have been generated on simple and hybrid composite tubes with one, two and three layers. a drop test rig was used to conduct the experiments. furthermore, in order to gain more detailed knowledge about the crash process, finite element simulations of the experiments...