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The broad applications of 3D‐printed poly‐ether‐ether‐ketone (3D‐PEEK) structures are largely hampered by their inadequate mechanical properties that can be improved by post treatments. At present, thermal annealing is generally used to improve the mechanical properties of 3D‐PEEK. However, it cannot simultaneously improve strength and ductility. Here, a cost‐effective postprocessing method is developed...
It has long been demonstrated the gecko‐inspired micropillar array with T‐shape tips possesses the best adhesion performance of a given material. The further enhancement of the adhesion performances of T‐shape micropillars can offer redundant adhesion to compensate for the inevitable improper contacts. Here, the array of T‐shape polydimethylsiloxane (PDMS) micropillars is incorporated with gradient...
Switchable structured adhesion on rough surfaces is highly desired for a wide range of applications. Combing the advantages of gecko seta and creeper root, a switchable fibrillar adhesive composed of polyurethane (PU) as the backing layer and graphene/shape memory polymer (GSMP) as the pillar array is developed. The photothermal effect of graphene (under UV irradiation) changes GSMP micropillars into...
Here we study the shape, size, and merging pattern of the area following the toll barrier, from the five aspects including the accident prevention, throughput, cost, service time and passing capacity. We build the corresponding model of the new single-in and double_out toll station to measure the optimal solution of the toll plaza on the basis of a series of methods such as the factor analysis, principal...
Analysis of airgap magnetic field is the basis of design and performance analysis of permanent magnet (PM) motors. Based on 2D models in polar coordinates, the analytical formulas of the open-circuit airgap flux density in PM motors equipped with parallel magnetised magnets are derived by solving the Laplace's equation or Poisson's equation in the regions of airgap, PM and shaft core. And based on...
Evaluating the high cycle fatigue (HCF) and the thermal mechanical fatigue (TMF) is a critical aspect of the heavy duty gas turbine blade design and manufacture. But the highly accelerated stress screening (HASS) method can be used to assess the high cycle fatigue life of the blades and the manufacturing process defects. In this paper, an electromagnetic resonant device is designed to test HCF and...
The wave journal bearing was first reported by Dimofte In the early 1990's. The static behavior of a hydrodynamic wave journal bearing is present in this paper. It is found that the static performance is related to the design parameters including eccentricity ratio, wave number, wave amplitude ratio and wave position angle. It is shown by the numerical results that the influence of the wave number...
In the last years, heavy-duty gas turbine has been increasingly used as high efficiency systems for heat and power generation. The typical size of these powerplants mainly consist compressor, turbine and combustor. And the rotor disc assembly structure is different from the single whole rotor structure. Several computer codes have been developed to analyse the strength of the rotor. In the present...
Disc-rotor has the advantages that the common continuous rotor doesn't have, but the specific structure of the disc-rotor makes it complex to compute the natural frequencies and vibration modes. It is mainly reflected in that the discs contact each other, which will bring considerable impact on the dynamic behavior of the disc-rotor. The state of contact between the discs is closely related rod preload...
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