• Title/Summary/Keyword: paris

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Microcracking of Motor Case with Fiberite 934/T300 Laminates under fatigue Loads (피로하중을 받는 Fiberite 934/T300 복합재료로 만들어진 연소관의 미세균열 연구)

  • 김형원;김성은
    • Journal of the Korean Society of Propulsion Engineers
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    • v.1 no.1
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    • pp.82-88
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    • 1997
  • The goal is to assess the effect of fatigue loading on mechanical properties of Fiberite 934/T300 laminates of pressure vessel using the recent variational mechanics analysis. This analysis has been useful in providing fracture mechanics interpretation of matrix microcracking in cross-ply laminates. This paper describes using the new energy release rate analysis for a fracture mechanics based interpretation of microcrack formation during fatigue loading. The master plot by modified Paris-law gives a complete characterization of a material system's resistance to microcrack formation.

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LARGE SCALE MAGNETOGENESIS THROUGH RADIATION PRESSURE

  • LANGER MATHIEU;PUGET JEAN-LOUP;AGHANIM NABILA
    • Journal of The Korean Astronomical Society
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    • v.37 no.5
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    • pp.553-556
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    • 2004
  • We present a new model for the generation of magnetic fields on large scales occurring at the end of cosmological reionisation. The inhomogeneous radiation provided by luminous sources and the fluctuations in the matter density field are the major ingredients of the model. More specifically, differential radiation pressure acting on ions and electrons gives rise to electric currents which induce magnetic fields on large scales. We show that on protogalactic scales, this process is highly efficient, leading to magnetic field amplitudes of the order of $10^{-1l}$ Gauss. While remaining of negligible dynamical impact, those amplitudes are million times higher than those obtained in usual astrophysical magnetogenesis models. Finally, we derive the relation between the power spectrum of the generated field and the one of the matter density fluctuations. We show in particular that magnetic fields are preferably created on large (galactic or cluster) scales. Small scale magnetic fields are strongly disfavoured, which further makes the process we propose an ideal candidate to explain the origin of magnetic fields in large scale structures.