Stress And Strain Definition Pdf

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Stress and strain are two quantities that are used to define the nature of the applied force and resulting deformation.

A model of a rigid body is an idealized example of an object that does not deform under the actions of external forces. It is very useful when analyzing mechanical systems—and many physical objects are indeed rigid to a great extent. The extent to which an object can be perceived as rigid depends on the physical properties of the material from which it is made.

Book on Mechanics of Materials(Simple Stress and Strain)

Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our User Agreement and Privacy Policy. See our Privacy Policy and User Agreement for details. Published on Nov 27, This document gives the class notes of Unit Torsion of circular shafts and elastic stability of columns. Subject: Mechanics of materials.

Stress and Strain is the first topic in Strength of Materials which consist of various types of stresses, strains and different properties of materials which are important while working on them. As particular stress generally holds true only at a point, therefore it is defined mathematically as. If the force applied are perpendicular or normal to areas concerned, then these are termed as normal stresses. The normal stresses can be either tensile or compressive depending upon the direction of the load. Such forces are associated with a shearing of the material, are known as shear forces. The stress produced by these forces are known as shear stresses. The same form of relationship can be obtained for the other two pair of shear stress components to arrive at the relations,.

Stress and Strain Study Notes for Mechanical Engineering

In continuum mechanics , stress is a physical quantity that expresses the internal forces that neighbouring particles of a continuous material exert on each other, while strain is the measure of the deformation of the material. For example, when a solid vertical bar is supporting an overhead weight , each particle in the bar pushes on the particles immediately below it. When a liquid is in a closed container under pressure , each particle gets pushed against by all the surrounding particles. The container walls and the pressure -inducing surface such as a piston push against them in Newtonian reaction. These macroscopic forces are actually the net result of a very large number of intermolecular forces and collisions between the particles in those molecules. Strain inside a material may arise by various mechanisms, such as stress as applied by external forces to the bulk material like gravity or to its surface like contact forces , external pressure, or friction.

Strain and Stress

The Tensile stress is like pulling the material on each side or might one side as figures shown below,. The Compressive stress is like pushing the material on each side or might one side as figures shown below,. The figure is shown below,. They have the tendency to hold the deformation that occurs in the plastic region. A material is brittle if, when subjected to stress, it breaks without significant plastic deformation.

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Stress-Strain Curve. Stress can cause strain, if it is sufficient to overcome the strength of the object that is under stress. Enter the email address you signed up with and we'll email you a reset link.

Book on Mechanics of Materials(Simple Stress and Strain)

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