Difference between revisions of "Template:Elastic moduli"

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imported>Headbomb
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{{Navbox
 
{{Navbox
| name = Elastic moduli
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| name = Elastic moduli
 
| title = [[Elastic modulus|Elastic moduli]] for homogeneous [[isotropic]] materials
 
| title = [[Elastic modulus|Elastic moduli]] for homogeneous [[isotropic]] materials
| list1 = [[Bulk modulus]] (<math>K</math>) [[Young's modulus]] (<math>E</math>) [[Lamé parameters|Lamé's first parameter]] (<math>\lambda</math>) [[Shear modulus]] (<math>G</math>) [[Poisson's ratio]] (<math>\nu</math>) [[P-wave modulus]] (<math>M</math>)
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| list1 = [[Bulk modulus]] (<math>K</math>){{·}} [[Young's modulus]] (<math>E</math>){{·}} [[Lamé parameters|Lamé's first parameter]] (<math>\lambda</math>){{·}} [[Shear modulus]] (<math>G</math>){{·}} [[Poisson's ratio]] (<math>\nu</math>){{·}} [[P-wave modulus]] (<math>M</math>)
 
| state = show
 
| state = show
 
}}
 
}}

Revision as of 20:35, 19 August 2011

Conversion formulas
Homogeneous isotropic linear elastic materials have their elastic properties uniquely determined by any two moduli among these, thus given any two, any other of the elastic moduli can be calculated according to these formulas.
<math>(\lambda,\,G)</math> <math>(E,\,G)</math> <math>(K,\,\lambda)</math> <math>(K,\,G)</math> <math>(\lambda,\,\nu)</math> <math>(G,\,\nu)</math> <math>(E,\,\nu)</math> <math>(K,\, \nu)</math> <math>(K,\,E)</math> <math>(M,\,G)</math>
<math>K=\,</math> <math>\lambda+ \tfrac{2G}{3}</math> <math>\tfrac{EG}{3(3G-E)}</math> <math>\tfrac{\lambda(1+\nu)}{3\nu}</math> <math>\tfrac{2G(1+\nu)}{3(1-2\nu)}</math> <math>\tfrac{E}{3(1-2\nu)}</math> <math>M - \tfrac{4G}{3}</math>
<math>E=\, </math> <math>\tfrac{G(3\lambda + 2G)}{\lambda + G}</math> <math>\tfrac{9K(K-\lambda)}{3K-\lambda}</math> <math>\tfrac{9KG}{3K+G}</math> <math>\tfrac{\lambda(1+\nu)(1-2\nu)}{\nu}</math> <math>2G(1+\nu)\,</math> <math>3K(1-2\nu)\,</math> <math>\tfrac{G(3M-4G)}{M-G}</math>
<math>\lambda=\,</math> <math>\tfrac{G(E-2G)}{3G-E}</math> <math>K-\tfrac{2G}{3}</math> <math>\tfrac{2 G \nu}{1-2\nu}</math> <math>\tfrac{E\nu}{(1+\nu)(1-2\nu)}</math> <math>\tfrac{3K\nu}{1+\nu}</math> <math>\tfrac{3K(3K-E)}{9K-E}</math> <math>M - 2G\,</math>
<math>G=\, </math> <math>\tfrac{3(K-\lambda)}{2}</math> <math>\tfrac{\lambda(1-2\nu)}{2\nu}</math> <math>\tfrac{E}{2(1+\nu)}</math> <math>\tfrac{3K(1-2\nu)}{2(1+\nu)}</math> <math>\tfrac{3KE}{9K-E}</math>
<math>\nu=\,</math> <math>\tfrac{\lambda}{2(\lambda + G)}</math> <math>\tfrac{E}{2G}-1</math> <math>\tfrac{\lambda}{3K-\lambda}</math> <math>\tfrac{3K-2G}{2(3K+G)}</math> <math>\tfrac{3K-E}{6K}</math> <math>\tfrac{M - 2G}{2M - 2G}</math>
<math>M=\,</math> <math>\lambda+2G\,</math> <math>\tfrac{G(4G-E)}{3G-E}</math> <math>3K-2\lambda\,</math> <math>K+\tfrac{4G}{3}</math> <math>\tfrac{\lambda(1-\nu)}{\nu}</math> <math>\tfrac{2G(1-\nu)}{1-2\nu} </math> <math>\tfrac{E(1-\nu)}{(1+\nu)(1-2\nu)}</math> <math>\tfrac{3K(1-\nu)}{1+\nu}</math> <math>\tfrac{3K(3K+E)}{9K-E}</math>

The stiffness matrix (9 by 9, or 6 by 6 in Voigt notation) in Hooke's law (in 3D) can be parametrized by only two components for homogeneous and isotropic materials. One may choose whichever pair one prefers among the elastic moduli given below. Some of the possible conversions are listed in the table.


References

  • G. Mavko, T. Mukerji, J. Dvorkin. The Rock Physics Handbook. Cambridge University Press 2003 (paperback). ISBN 0-521-54344-4

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