The field equations of elasticity

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SUMMARY

The field equations of elasticity, specifically concerning stress, strain, and displacement, are categorized as hyperbolic equations. This classification is based on the presence of two time derivatives and two space derivatives with positive coefficients in the displacement equation of an elastic medium. The discussion also references Navier's equations, confirming their relevance to the topic. Understanding these classifications is essential for comprehending the behavior of elastic materials under various conditions.

PREREQUISITES
  • Familiarity with differential equations, specifically elliptic, parabolic, and hyperbolic types.
  • Understanding of elasticity concepts, including stress, strain, and displacement.
  • Knowledge of Navier's equations and their application in elasticity.
  • Basic mathematical skills to analyze equations with derivatives.
NEXT STEPS
  • Research the characteristics and applications of hyperbolic differential equations.
  • Study Navier's equations in detail to understand their role in elasticity.
  • Explore the differences between elliptic, parabolic, and hyperbolic equations in mathematical physics.
  • Learn about the physical implications of stress and strain in elastic materials.
USEFUL FOR

Mathematicians, physicists, and engineers involved in material science, structural analysis, and anyone seeking to deepen their understanding of elasticity and differential equations.

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TL;DR
What is the mathematical category of the field equations of elasticity?
First, my ignorance... I know there are classes of equations: Laplace, Poisson, Wave, Diffusion, etc.

(I suppose Laplace is a subset of Poisson, but that is not the issue).

Into what category of mathematical equations would you place the field equations of elasticity (stress/strain/displacement)?
 
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Why do you feel that they need to have a specific name?
 
Chestermiller said:
Why do you feel that they need to have a specific name?
Oh, I don't -- not in the least. Sometimes, names and categories undermine learning.

However, I DO know there are names given to the various types of differential equations and I am only interested to know if the field equations of elasticity are part of a particular category.
 
The relevant categorisation is as elliptic (Poisson), parabolic (diffusion) or hyperbolic (wave).

The equation for displacement of an elastic medium has at leading order two time derivatives on the left and two space derivatives on the right, both with positive coefficieints; we have therefore a hyperbolic system.
 
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Are you talking about Navier's equations?
 
Yes to Mason and hunt
 
Mason7 said:
I think you are talking about Navier's equation. Am i right?
Yes
 

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