stress and strain definition pdf

Stress And Strain Definition Pdf

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Every component in a linear motion system experiences some form of loading due to applied forces or motion. Strain is the deformation or displacement of material that results from an applied stress. The most common way to analyze the relationship between stress and strain for a particular material is with a stress-strain diagram. For many materials, the proportional limit and the elastic limit are the same or nearly equal. In the stress-strain curve shown here, the proportional limit and the elastic limit are assumed to be the same.

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.

Stress and Strain Study Notes for Mechanical Engineering

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.

Strain and Stress

Stress and strain are two quantities that are used to define the nature of the applied force and resulting deformation. Stress is defined as the internal restoring force applying per unit area of the deformed body. Tensile stress : Tensile stress is defined as the increase in length of the body due to applied force. Compressive stress: It is defined as the decrease in length of the body due to applied force. Strain is defined as the change in shape or size of a body due to deforming force applied on it.

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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.

Mechanical properties of materials: Stress and strain

Stress and strain are two quantities that are used to define the nature of the applied force and resulting deformation. Stress is defined as the internal restoring force applying per unit area of the deformed body. Tensile stress : Tensile stress is defined as the increase in length of the body due to applied force. Compressive stress: It is defined as the decrease in length of the body due to applied force.

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.

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.

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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. In this rod the tensile stress developed is given by P 10 kN N. The resultant of the internal forces for an axially loaded member is normal to a section cut perpendicular to the member axis.

Book on Mechanics of Materials(Simple 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 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.

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.

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4 Comments

  1. Grace W.

    is defined as, the deformation force per unit area of the body or material.

    06.05.2021 at 14:57 Reply
  2. Fiorel Z.

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    07.05.2021 at 07:46 Reply
  3. Marilena C.

    Roylance (Wiley, ); My lecture notes. Mechanical Properties of Materials. OHP 1. Definition of Stress. • Stress, σ.

    11.05.2021 at 10:51 Reply
  4. Ramses Z.

    Modulus of elasticity E is proportional to (dF/dr)r. □ Slope of stress strain plot (​which is proportional to the elastic modulus) depends on bond strength of metal.

    13.05.2021 at 16:08 Reply

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