A yield surface is a five-dimensional surface in the six-dimensional space of stresses. The yield surface is usually convex and the state of stress of inside the yield surface is elastic. When the stress state lies on the surface the material is said to have reached its yield point and the material is said to have become plastic. Further deformation of the material causes the stress state to remain on the yield surface, even though the shape and size of the surface may change as the plastic deformation evolves. This is because stress states that lie outside the yield surface are non-permissible in rate-independent plasticity, though not in some models of viscoplasticity.

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dbo:abstract
  • La superficie de fluencia de un material es una construcción abstracta que permite visualizar el conjunto de tensiones posibles o admisibles dentro de un sólido deformable elastoplástico. (es)
  • Un critère de plasticité, ou critère d'écoulement plastique, est un critère permettant de savoir, sous des sollicitations données, si une pièce se déforme plastiquement ou si elle reste dans le domaine élastique. De nombreux essais ont montré que l'on pouvait utiliser deux critères principaux : le critère de Tresca-Guest ou le critère de von Mises. En résistance des matériaux, on désire parfois rester dans le domaine élastique, on parle alors de critère de résistance. La contrainte de comparaison n'est pas une contrainte réelle existant à un instant donné à l'intérieur d'un solide, mais est utilisée en mécanique pour prédire la rupture. Néanmoins, la plupart des ingénieurs l'utilisent pour déterminer si un champ de contrainte donné dans une pièce est acceptable ou non. On parle aussi de contrainte équivalente ou de contrainte effective. Elle découle des critères de plasticité. Cette contrainte est comparée à la limite d'élasticité ou encore la contrainte de rupture obtenue par essai de traction. (fr)
  • I criteri di resistenza dei materiali costituiscono un metodo semiempirico per costruire il dominio elastico degli stati tensionali ammissibili per i materiali, cioè l'intervallo di stati tensionali che i diversi materiali possono sopportare senza intercorrere in condizioni limite di snervamento per materiali duttili o di rottura per materiali fragili. (it)
  • A yield surface is a five-dimensional surface in the six-dimensional space of stresses. The yield surface is usually convex and the state of stress of inside the yield surface is elastic. When the stress state lies on the surface the material is said to have reached its yield point and the material is said to have become plastic. Further deformation of the material causes the stress state to remain on the yield surface, even though the shape and size of the surface may change as the plastic deformation evolves. This is because stress states that lie outside the yield surface are non-permissible in rate-independent plasticity, though not in some models of viscoplasticity. The yield surface is usually expressed in terms of (and visualized in) a three-dimensional principal stress space (), a two- or three-dimensional space spanned by stress invariants () or a version of the three-dimensional Haigh–Westergaard stress space. Thus we may write the equation of the yield surface (that is, the yield function) in the forms: * where are the principal stresses. * where is the first principal invariant of the Cauchy stress and are the second and third principal invariants of the deviatoric part of the Cauchy stress. * where are scaled versions of and and is a function of . * where are scaled versions of and , and is the Lode angle. (en)
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  • In 3D space of principal stresses
  • In the -plane
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  • yield surface
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rdfs:comment
  • La superficie de fluencia de un material es una construcción abstracta que permite visualizar el conjunto de tensiones posibles o admisibles dentro de un sólido deformable elastoplástico. (es)
  • I criteri di resistenza dei materiali costituiscono un metodo semiempirico per costruire il dominio elastico degli stati tensionali ammissibili per i materiali, cioè l'intervallo di stati tensionali che i diversi materiali possono sopportare senza intercorrere in condizioni limite di snervamento per materiali duttili o di rottura per materiali fragili. (it)
  • A yield surface is a five-dimensional surface in the six-dimensional space of stresses. The yield surface is usually convex and the state of stress of inside the yield surface is elastic. When the stress state lies on the surface the material is said to have reached its yield point and the material is said to have become plastic. Further deformation of the material causes the stress state to remain on the yield surface, even though the shape and size of the surface may change as the plastic deformation evolves. This is because stress states that lie outside the yield surface are non-permissible in rate-independent plasticity, though not in some models of viscoplasticity. (en)
  • Un critère de plasticité, ou critère d'écoulement plastique, est un critère permettant de savoir, sous des sollicitations données, si une pièce se déforme plastiquement ou si elle reste dans le domaine élastique. De nombreux essais ont montré que l'on pouvait utiliser deux critères principaux : le critère de Tresca-Guest ou le critère de von Mises. En résistance des matériaux, on désire parfois rester dans le domaine élastique, on parle alors de critère de résistance. Cette contrainte est comparée à la limite d'élasticité ou encore la contrainte de rupture obtenue par essai de traction. (fr)
rdfs:label
  • Superficie de fluencia (es)
  • Yield surface (en)
  • Critère de plasticité (fr)
  • Criteri di resistenza (it)
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