Concept Of Stress And Strain Pdf

concept of stress and strain pdf

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This section introduces you to the concepts of stress and strain. This chapter deals with two types of geological activity that occur because of plate tectonics: mountain building and earthquakes.

A model of a rigid body is an idealized example of an object that does not deform under the actions of external forces.

Mechanical properties of materials: Stress and strain

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.

The internal resistance force per unit area acting on a material or intensity of the forces distributed over a given section is called the stress at a point. It uses original cross section area of the specimen and also known as engineering stress or conventional stress. This unit is called Pascal Pa. As Pascal is a small quantity, in practice, multiples of this unit is used. Let us take an example: A rod 10 mm 10 mm cross-section is carrying an axial tensile load 10 kN.

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Book on Mechanics of Materials(Simple Stress and Strain)

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. Brittle materials absorb relatively little energy prior to fracture, even those of high strength. The proportional limit is the point on the curve up to which the value of stress and strain remains proportional.


Know how to compute strains and stresses of members defined as the shear of the section and is equal to the load. P. Shearing Stress Examples. A. F. A. P.


Stress, Strain, Hooke’s Law

The internal resistance force per unit area acting on a material or intensity of the forces distributed over a given section is called the stress at a point. It uses original cross section area of the specimen and also known as engineering stress or conventional stress. This unit is called Pascal Pa. As Pascal is a small quantity, in practice, multiples of this unit is used.

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Stress, Strain, Hooke’s Law

Chapter - 1 Stress and strain.pdf

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. Any strain deformation of a solid material generates an internal elastic stress , analogous to the reaction force of a spring , that tends to restore the material to its original non-deformed state.

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OHP 1. Definition of Stress. • Stress, σ, is defined as the intensity of force at a point: σ = dF/dA as dA approaches 0. • If the state of stress is the same everywhere.


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a) Principal. Stresses b) Von Mises. Stress c) Etc. Page 3. OPTI Mechanical Design in Optical Engineering. 3. Consider.

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Concepts of stress and strain. □ Elastic deformation. • Stress-strain behavior. • Elastic properties of materials. □ Plastic deformation. • Yield and yield strength.

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