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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, Shear, Stress

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