01 Introduction - 1 Introduction1 1.1 Definitions:2 Solid:...

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1 Introduction 1 1.1 Definitions: 2 Solid: Substance in which the molecules tend to retain a fixed position If a shear force is applied the substance will deform γ Figure 1 Shear load on a solid (Shames 2003). When the force is released the material is returned to essentially its original state (Note: subject to constituent relationships). The shear stress in a solid is linearly related to the shear strain, , by the shear modulus of elasticity,: G ( 29 G τ = * deformation* Fluid: Substance in which the molecules are free to move with respect to one another If a shear force is applied it generates a deformation rate (a.k.a. “velocity”) * deformation rate* Figure 2 Shear load applied to a fluid (Shames 2003). 1 Chapter 1 Panton 2 pg 3-5 Shames, pg 4-5 Potter and Foss, pg 1-4 Batchelor
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This isn’t really a black & white issue: e.g. glass, play-dough Could flow or fracture (depend on rate of force application) Two Types of Fluids 1. Liquids : state of matter in which the molecules are free to move with respect to one another, but they are constrained or restricted by intermolecular cohesive forces . liquids have a definite volume they will form a free surface in a gravitational field if unconstrained from above g  2. Gas : state of matter where the molecules are free to move with respect one another, but they are not constrained by intermolecular forces (i.e. they are subject to collision processes). no definite shape, volume
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01 Introduction - 1 Introduction1 1.1 Definitions:2 Solid:...

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