Define stress, Mechanical Engineering

Assignment Help:

Define stress:

Sol.: When body is acted upon by load or external force, it undergoes deformation (that is, change in shape or dimension) which increases gradually. At the time deformation, the material of the body resists the tendency of the load to deform the body, and when load influence is taken over by internal resistance of material of the body, it becomes stable. Internal resistance which is offered by body to meet with the load is called as stress.

Or, the force of resistance per unit area, which is offered by a body against deformation, is called as stress. Stress can be considered as total stress or unit stress. Total stress represent total resistance to an external effect and can be expressed in N,KN etc. Unit stress represents resistance developed by unit area of cross section, and can be expressed in KN/m2.

If external load is applied just in one direction, the stress developed is called as simple stress whereas

If the external loads are applied in over one direction, the stress developed is called as compound stress.

Normal stress ( σ ) = P/A N/m2

1 Pascal(Pa) = 1 N/m2

1KPa = 103  N/m2

1MPa = 106  N/m2

1GPa = 109  N/m2 


Related Discussions:- Define stress

Find out the acceleration of the mass centre, Find out the Acceleration of ...

Find out the Acceleration of the mass centre: A wheel of mass 200 kg and a diameter of 700 mm rolls without slipping down a plane inclined at an angle of 20 o with the horizo

General factors behind accidents , GENERAL FACTORS BEHIND ACCIDENT:  Follow...

GENERAL FACTORS BEHIND ACCIDENT:  Following are the factors, which may cause accidents in workshop, so we should take care of these factors: Insufficient light and ventilati

Explain the semi universal drilling machine, Explain the semi universal dri...

Explain the semi universal drilling machine The semi universal drilling machine this machines, in addition to the above three basic movements, carry provision for swinging of

Trusses, Differentiate between perfect, deficient and redundant trusses

Differentiate between perfect, deficient and redundant trusses

Wilson hartnell governor, how to design and fabricate wilson hartnell gover...

how to design and fabricate wilson hartnell governor?

Determine magnitude of greatest shear stress, At a point in a rectangular b...

At a point in a rectangular block of elastic material under strain, there is a tensile stress of 50MPa on one plane and a compressive stress of 30 MPa on a plane at right angles. T

Couple, What are properties of couple

What are properties of couple

Thermodynamic 1st law, What is the diff between system underfoing cycle and...

What is the diff between system underfoing cycle and system undergoing process

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd