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  • FIR-detection  (1)
  • Flexbeam  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Combined tension and bending testing of tapered composite laminates (1994)
    Springer
    Applied composite materials 1 (1994), S. 401-413 
    Details
    ISSN: 1573-4897
    Schlagwort(e): Composite materials ; Rotor hubs ; Flexbeam ; Tapered laminate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A simple beam element used at Bell Helicopter was incorporated in the Computational Mechanics Testbed (COMET) finite element code at the Langley Research Center (LaRC) to analyze the responce of tappered laminates typical of flexbeams in composite rotor hubs. This beam element incorporated the influence of membrane loads on the flexural response of the tapered laminate configurations modeled and tested in a combined axial tension and bending (ATB) hydraulic load frame designed and built at LaRC. The moments generated from the finite element model were used in a tapered laminated plate theory analysis to estimate axial stresses on the surface of the tapered laminates due to combined bending and tension loads. Surfaces strains were calculated and compared to surface strains measured using strain gages mounted along the laminate length. The strain distributions correlated reasonably well with the analysis. The analysis was then used to examine the surface strain distribution in a non-linear tapered laminate where a similarly good correlation was obtained. Results indicate that simple finite element beam models may be used to identify tapered laminate configurations best suited for simulating the response of a composite flexbeam in a full scale rotor hub.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00706501
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  • 2
    Digitale Medien
    Digitale Medien
    Far infrared response of thin film Bi2Sr2CaCu2O8 using a free electron laser (1992)
    Springer
    International journal of infrared and millimeter waves 13 (1992), S. 1659-1666 
    Details
    ISSN: 1572-9559
    Schlagwort(e): High-Tc superconductors ; FIR-detection ; free-electronlaser
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The far infrared response of granular thin-film Bi2Sr2CaCu2O8 superconductor has been investigated using long (≈5 μs) but sharply truncated free electron laser pulses in the frequency range between 50 cm−1 and 125 cm−1. Under constant current bias, a fast response and a slow bolometric signal component could be identified in this energy range, which is below the BCS energy gap (≈ 200 cm−1). Measurements of the power dependences of the signal voltages showed that both the fast and the thermal responses are consistent with the predictions of the resistively shunted Josephson junction model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01009243
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