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Unformatted text preview: Introduction – Concept of Stress ENGR2530 Strength of Materials Lecture 1 1/17/06 2 Outline Concept of Stress Review of Statics Stress Analysis • Axial Loading: Normal Stress • Centric & Eccentric Loading • Shearing Stress • Bearing Stress in Connections Stress Analysis & Design Example • Rod & Boom Normal Stresses • Pin Shearing Stresses • Pin Bearing Stresses • Stress in Two Force Members 3 Mechanics of materials and concept of Stress • Mechanics of materials provides: the means of analyzing and designing various machines and load bearing structures. • Analysis and design of a given structure involve the determination of stresses and deformations (i.e, strains) . • This lecture is devoted to the concept of stress. 4 Review of Statics • The structure is designed to support a 30 kN load • Perform a static analysis to determine the internal force in each structural member and the reaction forces at the supports • The structure consists of a boom and rod joined by pins (zero moment connections) at the junctions and supports 5 Structure FreeBody Diagram • Structure is detached from supports and the loads and reaction forces are indicated • A y and C y can not be determined from these equations ( ) ( )( ) kN 30 kN 30 kN 40 kN 40 m 8 . kN 30 m 6 . = + = − + = = − = − = + = = = − = = ∑ ∑ ∑ y y y y y x x x x x x x C C A C A F A C C A F A A M • Conditions for static equilibrium: 6 Component FreeBody Diagram • In addition to the complete structure, each component must satisfy the conditions for static equilibrium • Results: ↑ = ← = → = kN 30 kN 40 kN 40 y x C C A Reaction forces are directed along boom and rod ( ) m 8 ....
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 Fall '08
 LINDASCHADLERFEIST
 Statics, Force, Shear, Stress, kN

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