Archive for març, 2017

Chapter 9. MECHANICAL PROPERTIES OF SOLIDS.

9.1 Elastic behaviour of solids.

9.2 Method of sections.

9.3 Normal stress and shear stress.

9.4 Axial deformation: Young’s modulus.

Objectives:

  • Demonstrate your understanding of elasticity, elastic limit, stress, strain, and, ultimate strength.
  • Write and apply formulas for calculating Young’s modulus, shear modulus, and, bulk modulus.
  • Solve problems involving deformation in members of loaded trusses.

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A rigid body is said to in equilibrium if the resultant of all forces and all their moments taken about any and all points are zero.

Free body diagram (FBD): depiction of an object with ALL the external forces acting on it.

Reactions coming from the supports: usually a body is constrained against motions using supports. It is essentially to correctly estimate the number and type of reactions that a support can provide.

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