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Unformatted text preview: Formulation of TwoDimensional Elasticity Problems Professor M. H. Sadd Simplified Elasticity Formulations Displacement Formulation Eliminate the stresses and strains from the general system of equations. This generates a system of three equations for the three unknown displacement components. Stress Formulation Eliminate the displacements and strains from the general system of equations. This generates a system of six equations and for the six unknown stress components. The General System of Elasticity Field Equations of 15 Equations for 15 Unknowns Is Very Difficult to Solve for Most Meaningful Problems, and So Modified Formulations Have Been Developed. Solution to Elasticity Problems F(z) G(x,y) z x y Even Using Displacement and Stress Formulations ThreeDimensional Problems Are Difficult to Solve! So Most Solutions Are Developed for TwoDimensional Problems Two and Three Dimensional Problems x y z x y z ThreeDimensional TwoDimensional x y z Spherical Cavity TwoDimensional Formulation x y z R x y z R 2 h Plane Strain Plane Stress , ) , ( , ) , ( = = = w y x v v y x u u ) , ( ) , ( ) , ( = = = = = = yz xz z xy xy y y x x y x y x y x << other dimensions Examples of Plane Strain Problems x y z x y z P Long Cylinders Under Uniform Loading SemiInfinite Regions Under Uniform Loadings Examples of Plane Stress Problems Thin Plate With Central Hole Circular Plate Under Edge Loadings Plane Strain Formulation 2 1 , , = = = + = = = yz xz z xy y x e e e x v y u e y v e x u e StrainDisplacement , 2 ) ( ) ( 2 ) ( 2 ) ( = = = + = + = + + = + + = yz xz xy xy y x y x z y y x y x y x x e e e e e e e e e Hookes Law , ) , ( , ) , ( = = = w y x v v y x u u Plane Strain Formulation ) ( ) ( 2 2 = + + + + = +...
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This note was uploaded on 10/03/2011 for the course MCE 561 taught by Professor Sadd during the Spring '11 term at Rhode Island.
 Spring '11
 Sadd

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