# Direct stress and strain pdf

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## Stress (mechanics)

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. For example, a ping-pong ball made of plastic is brittle, and a tennis ball made of rubber is elastic when acted upon by squashing forces. However, under other circumstances, both a ping-pong ball and a tennis ball may bounce well as rigid bodies.

### Book on Mechanics of Materials(Simple Stress and Strain)

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.

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. For example, a ping-pong ball made of plastic is brittle, and a tennis ball made of rubber is elastic when acted upon by squashing forces. However, under other circumstances, both a ping-pong ball and a tennis ball may bounce well as rigid bodies.

## Direct Stress and Strain

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.

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Strain So far, we've focused on the stress within structural elements. When you apply stress to an object, it deforms. Think of a rubber band: you pull on it, and it gets longer — it stretches. Just like stress, there are two types of strain that a structure can experience: 1. Shear Strain.

### Mechanical properties of materials: Stress and strain

New Modules Updated Modules. Intoduction to terms used in "Materials" and the concepts of Direct Stress and Strain. View other versions 4. Venant Strain Hooke's Law.

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### Stress (mechanics)

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• #### Dasalsele 21.05.2021 at 00:13

Foxit Advanced PDF Editor · To remove this notice, ratio of direct stress to the corresponding volumetric strain is known as bulk modules. Fig. K. -. = δ. P. V/ V.

• #### Mandel M. 22.05.2021 at 18:34

Define direct stress and strain. • Define shear stress and strain. • Define the modulus of elasticity and rigidity. • Solve basic problems involving stress, strain and.

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