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  • Composite Materials  (1)
  • Grignard reagents, 1,3-di-  (1)
  • Platinum, complexes of  (1)
  • 1
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    Vibro-Acoustic Modulation Based Damage Identification in a Composite Skin-Stiffener Structure (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The vibro-acoustic modulation method is applied to a composite skin-stiffener structure to investigate the possibilities to utilize this method for damage identification in terms of detection, localisation and damage quantification. The research comprises a theoretical part and an experimental part. An impact load is applied to the skin-stiffener structure, resulting in a delamination underneath the stiffener. The structure is interrogated with a low frequency pump excitation and a high frequency carrier excitation. The analysis of the response in a frequency band around the carrier frequency is employed to assess the damage identification capabilities and to gain a better understanding of the modulations occurring and the underlying physical phenomena. Though vibro-acoustic is shown to be a sensitive method for damage identification, the complexity of the damage, combined with a high modal density, complicate the understanding of the relation between the physical phenomena and the modulations occurring. more research is recommended to reveal the physics behind the observations.
    Keywords: Composite Materials
    Type: NF1676L-17972 , European Workshop on Structural Health Monitoring (EWSHM 2014); Jul 08, 2014 - Jul 11, 2014; Nantes; France
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
    Electronic Resource
    Electronic Resource
    Four-Membered 1,8-Naphthalenediyl Transition Metallacycles (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1851-1856 
    Details
    ISSN: 0009-2940
    Keywords: Grignard reagents, 1,3-di- ; Titanocene ; Zirconocene ; Platinum, complexes of ; Rhodium, complexes of ; Iridium, complexes of ; Metallacycles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Five 1,8-naphthalenediyl transition metal compounds 2 were prepared by treating either 1,8-naphthalenediylmagnesium (1) or 1,8-dilithionaphthalene with the appropriate transition metal dichloride LnMCl2: LnM = Cp2Ti (2a), (PEt3)2Pt (2b), Cp* PPh3Rh (2c), Cp* PPh3Ir (2d), or Cp*2Zr (2e). The resulting metallacycles were characterized by NMR and mass spectrometry. X-ray crystal structure analyses were performed for (1,8-naphthalenediyl)titanocene (2a) and (1,8-naphthalenediyl)bis(triethylphosphane)platinum (2b). Despite the strain induced by the four-membered metal-containing rings, the naphthalene units show remarkably small distortions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941271006
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    Paper (German National Licenses)
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