| Deflection |
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| CATEGORIES ABOUT DEFLECTION | |
| solid mechanics | |
| materials science | |
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In physics In Physics deflection is the event where an object Collides and Bounce s against a plane surface. In such collisions involving a Sphere and a Plane , the collision angle formed with the Surface Normal (the ''incidental angle'' α) must equal the bounce angle (the ''accidental angle'' β), See also In construction In Engineering Mechanics , deflection is a term to describe the degree to which a Construction or Structural element Bends under a Load . An example of the use of deflection in this context is in building construction. Architect s and builders select materials for various applications. The Beams used for frame work are selected on the basis of deflection, amongst other factors. The Elastic deflection f and Angle of deflection φ (in Radian s) in the example image, a Cantilever beam, can be calculated using: :fB = F·L3 / (3·E·I) :φB = F·L2 / (2·E·I) where :F = Force acting on the tip of the beam :L = length of the beam ( Span ) :E = Modulus Of Elasticity :I = Area Moment Of Inertia From this formula it follows that the span L is the most determinating factor; if the span doubles, the deflection increases 23 = 8 fold. Building Code s determine the maximum deflection, usually as a Fraction of the span e.g. 1/400 or 1/600. Either ( Tensile ) Strength or deflection can determine the minimum dimension of the beam. |
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