Mis en évidence (analytiquement) par Siméon Denis Poisson, le coefficient de Poisson (aussi appelé coefficient principal de Poisson) permet de caractériser la contraction de la matière perpendiculairement à la direction de l'effort appliqué.

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  • Mis en évidence (analytiquement) par Siméon Denis Poisson, le coefficient de Poisson (aussi appelé coefficient principal de Poisson) permet de caractériser la contraction de la matière perpendiculairement à la direction de l'effort appliqué.
  • Il coefficiente di Poisson (indicato anche come coefficiente di contrazione trasversale o rapporto di Poisson e talune volte anche se erroneamente come modulo di poisson) è una caratteristica propria di ciascun materiale (dipendente dalla temperatura) che misura, in presenza di una sollecitazione monodirezionale longitudinale, il grado in cui il campione di materiale si restringe o si dilata trasversalmente. La definizione di modulo è errata in quanto il coefficiente di poisson assume valori adimensionali a differenza dei moduli, come nel caso del modulo di elasticità, i quali sono definiti come delle forze per unità di area.
  • ポアソン比(ポアソンひ、英語:Poisson's ratio、Poisson coefficient)とは、弾性限界内における物体に応力を加えた時の応力方向に沿ったひずみと、二次的に発生する応力に直角方向のひずみの比のことである。ヤング率などと同じく弾性限界内で材料固有の定数と見なされる。名称はフランスの物理学者シメオン・ドニ・ポアソンに由来する。
  • Poisson's ratio, named after Siméon Poisson, is the negative ratio of transverse to axial strain. When a material is compressed in one direction, it usually tends to expand in the other two directions perpendicular or parallel to the direction of flow. This phenomenon is called the Poisson effect. Poisson's ratio (nu) is a measure of this effect. The Poisson ratio is the fraction (or percent) of expansion divided by the fraction (or percent) of compression, for small values of these changes.Conversely, if the material is stretched rather than compressed, it usually tends to contract in the directions transverse to the direction of stretching. This is a common observation when a rubber band is stretched, when it becomes noticeably thinner. Again, the Poisson ratio will be the ratio of relative contraction to relative expansion, and will have the same value as above. In certain rare cases, a material will actually shrink in the transverse direction when compressed (or expand when stretched) which will yield a negative value of the Poisson ratio.The Poisson's ratio of a stable, isotropic, linear elastic material cannot be less than −1.0 nor greater than 0.5 due to the requirement that Young's modulus, the shear modulus and bulk modulus have positive values. Most materials have Poisson's ratio values ranging between 0.0 and 0.5. A perfectly incompressible material deformed elastically at small strains would have a Poisson's ratio of exactly 0.5. Most steels and rigid polymers when used within their design limits (before yield) exhibit values of about 0.3, increasing to 0.5 for post-yield deformation (Seismic Performance of Steel-Encased Concrete Piles by RJT Park) (which occurs largely at constant volume.) Rubber has a Poisson ratio of nearly 0.5. Cork's Poisson ratio is close to 0: showing very little lateral expansion when compressed. Some materials, mostly polymer foams, have a negative Poisson's ratio; if these auxetic materials are stretched in one direction, they become thicker in perpendicular direction.Some anisotropic materials have one or more Poisson ratios above 0.5 in some directions.Assuming that the material is stretched or compressed along the axial direction (the x axis in the below diagram):whereis the resulting Poisson's ratio,is transverse strain (negative for axial tension (stretching), positive for axial compression) is axial strain (positive for axial tension, negative for axial compression).
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  • Mis en évidence (analytiquement) par Siméon Denis Poisson, le coefficient de Poisson (aussi appelé coefficient principal de Poisson) permet de caractériser la contraction de la matière perpendiculairement à la direction de l'effort appliqué.
  • ポアソン比(ポアソンひ、英語:Poisson's ratio、Poisson coefficient)とは、弾性限界内における物体に応力を加えた時の応力方向に沿ったひずみと、二次的に発生する応力に直角方向のひずみの比のことである。ヤング率などと同じく弾性限界内で材料固有の定数と見なされる。名称はフランスの物理学者シメオン・ドニ・ポアソンに由来する。
  • Poisson's ratio, named after Siméon Poisson, is the negative ratio of transverse to axial strain. When a material is compressed in one direction, it usually tends to expand in the other two directions perpendicular or parallel to the direction of flow. This phenomenon is called the Poisson effect. Poisson's ratio (nu) is a measure of this effect.
  • Il coefficiente di Poisson (indicato anche come coefficiente di contrazione trasversale o rapporto di Poisson e talune volte anche se erroneamente come modulo di poisson) è una caratteristica propria di ciascun materiale (dipendente dalla temperatura) che misura, in presenza di una sollecitazione monodirezionale longitudinale, il grado in cui il campione di materiale si restringe o si dilata trasversalmente.
rdfs:label
  • Coefficient de Poisson
  • Coefficiente di Poisson
  • Coeficient de Poisson
  • Coeficiente de Poisson
  • Coeficiente de Poisson
  • Liczba Poissona
  • Poisson's ratio
  • Poisson-factor
  • Poisson-tényező
  • Poissonzahl
  • Коефициент на Поасон
  • Коэффициент Пуассона
  • ポアソン比
  • 푸아송 비
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