Stress1 - STRESS Hibbeler Chapter 1 Equilibrium of...

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Olek, CE 231,Fall 2004 STRESS Hibbeler – Chapter 1 Equilibrium of deformable body External forces and internal resultants Defining STRESS Difference between stress and load Types of stress Calculation of stresses Average normal stress Average shear stress
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Olek, CE 231,Fall 2004 Equilibrium of Deformable Body External Loads (Forces) Forces that act on a body Surface Forces Direct contact of the body with the surface of another (example- support reactions). Body Forces One body exerts a force on another with no physical contact (example-weight)
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Olek, CE 231,Fall 2004 Support Reactions Surface forces at the point of contact between bodies are called reactions Roller, Pin, or Fixed Supports F y F y F y F y F y F x F x F x M Roller Pin Fixed Curtsey of N. Neithalath
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Olek, CE 231,Fall 2004 Equilibrium of Deformable Body Internal Forces Act between two parts of a same body (on the cross section) Every particle exerts a force on every other particle All forces on any single particle replaced by resultants of these forces on that particle It is the intensity of these internal forces that we will refer to as stress
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Olek, CE 231,Fall 2004 Forces act on a body Resolve those Forces into its Resultants Resultant Forces and Moments Does Not give the actual Distribution of forces (internal loads) Need to obtain an understanding of actual load distribution inside the material Equilibrium of Deformable Body Curtsey of N. Neithalath
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Olek, CE 231,Fall 2004 Resolving Forces X Y F θ Resultant in the X – direction = F Cos θ Resultant in the Y – direction = F Sin θ Curtsey of N. Neithalath
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