# Stress And Strain Definition Pdf

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Published: 04.05.2021  Every component in a linear motion system experiences some form of loading due to applied forces or motion.

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.

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.

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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. Strain is measured by the ratio of change in dimension to the original dimension. Longitudinal strain: When the deforming force makes change in length alone, the strain produced is called longitudinal strain.

Volumetric strain: When the deforming force makes change in volume, the strain is called volumetric strain. Shearing strain: When the deforming force makes change in shape of the body, the strain is called shearing strain. Suppose a wire of uniform cross-section is suspended from a rigid support. When the load at other side is increased gradually, then length of wire goes on increasing.

If we plot the graph between stress and strain, then shape of the curve will be as shown in fig just below:. The portion OA of the graph is a straight line showing that up to point A, Stress produced in the wire is directly proportional to the strain i.

The point A is termed as Limit of Proportionality. The proportionality of limit is the maximum stress that a material can hold without the departure from a linear stress-strain relation. If the applied force from any point between O and A is removed, then wire will regains its original length. Note that slope of graph is decreased; this means that strain increases more rapidly with strain. The point B is termed as Elastic limit. Elastic limit of a body is maximum stress which a body can sustain and still regain its original shape and size if load is removed.

If the load is increased beyond elastic limit, a point C is reached at which there is marked increase in extension. The point C is termed as Yield Point. Between B and C, material becomes plastic i. The extension not recoverable after the removal of applied force is called as permanent set. If stress is increased beyond C, the wire lengthens rapidly until we reach at point D at the top of the curve.

The point D is termed as Ultimate strength or Breaking stress. It is the fracture or breaking point of the material. Beyond point D, even stress smaller than at C may continue to stretch the wire until it breaks.

Chand s Principles Of Physics. Amardeep will share information related to Mechanical Engineering in this platform. He is the author, editor at themechanicalengineering. I am ex- employee. I have some knowledg of stress measurement. My work is strain gauge instalations, wiring, connectors preparation for scanning box and datta loger and get print out. But i dont know the calculations. Now i got some confident with your valuable information. ## Chapter - 1 Stress and strain.pdf

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. ## THEMECHANICALENGINEERING

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.

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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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. #### Welcome to Scribd!

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 Young's modulus is defined as the ratio of the stress of the object to the strain of the object or body.

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. Strain is measured by the ratio of change in dimension to the original dimension. Longitudinal strain: When the deforming force makes change in length alone, the strain produced is called longitudinal strain.  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. Deformed rocks are common in geologically active areas.

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1. Christine M.

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

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