After prolonged use, springs deform permanently because ofa)its rigidityb)elastic fatiguec)elastic after effectd)plastic fatigueCorrect answer is option 'B'. Can you explain this answer?

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Class 11 Exam > Class 11 Questions > After prolonged use, springs deform permanent...

After prolonged use, springs deform permanently because of

a)
its rigidity
b)
elastic fatigue
c)
elastic after effect
d)
plastic fatigue

Correct answer is option 'B'. Can you explain this answer?

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Most Upvoted Answer

After prolonged use, springs deform permanently because ofa)its rigidi...

Springs deform permanently because of elastic fatigueness. The elasticity of the material of spring is lost and it deforms permanently.

Answered by Mohit Rajpoot · View profile

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Community Answer

After prolonged use, springs deform permanently because ofa)its rigidi...

Elastic Fatigue and Permanent Deformation of Springs

When a spring is subjected to prolonged use, it undergoes various types of stress and strain that can lead to permanent deformation. One of the main reasons for this deformation is elastic fatigue, which is the gradual degradation of a material's elasticity over time.

1. Elastic Fatigue
Elastic fatigue occurs when a material, such as a spring, is subjected to repeated cyclic loading and unloading. Each time the spring is compressed or stretched, it experiences stress and strain. While most materials can handle a certain amount of stress and strain without any permanent deformation, repeated loading and unloading can cause microscopic changes in the material's structure.

2. Cyclic Stress-Strain Relationship
When a spring is subjected to cyclic loading, its stress-strain relationship changes over time. Initially, the spring behaves elastically, meaning it returns to its original shape after being compressed or stretched. However, as the cycles continue, the spring's elasticity gradually decreases.

3. Microscopic Changes in the Material
During cyclic loading, the repeated stress and strain cause the spring's material to undergo microscopic changes. These changes can include dislocation movements, grain boundary movement, and the formation of small cracks. These microstructural changes accumulate over time and result in a decrease in the spring's elasticity.

4. Permanent Deformation
As the spring undergoes elastic fatigue, it reaches a point where the microscopic changes in its material structure become significant. At this stage, the spring loses its ability to return to its original shape and experiences permanent deformation. The amount of permanent deformation depends on factors such as the magnitude and frequency of the cyclic loading, as well as the material properties of the spring.

Conclusion
In conclusion, springs deform permanently after prolonged use due to elastic fatigue. This occurs as a result of repeated cyclic loading and unloading, which gradually degrades the spring's elasticity. The microscopic changes in the material's structure accumulate over time, leading to permanent deformation. It is important to consider elastic fatigue when designing and using springs to ensure their longevity and optimal performance.

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Clockwork refers to the inner workings of mechanical clock or watch (where it is known as “movement”) and different types of toys which work using a series of gears driven by a spring. Clockwork device is completely mechanical and its essential parts are:• A key (or crown) which you wind to add energy• A spiral spring in which the energy is stored• A set of gears through which the spring's energy is released. The gears control how quickly (or slowly) a clockwork machine can do things. Such as in mechanical clock / watch the mechanism is the set of hands that sweep around the dial to tell the time. In a clockwork car toy, the gears drive the wheels.Winding the clockwork with the key means tightening a sturdy metal spring, called the mainspring. It is the process of storing potential energy. Clockwork springs are usually twists of thick steel, so tightening them (forcing the spring to occupy a much smaller spac e) is actually quite hard work. With each turn of the key, fingers do work and potential energy is stored in the spring. The amount of energy stored depends on the size and tension of the spring. Harder a spring is to turn and longer it is wound, the more energy it stores.While the spring uncoils, the potential energy is converted into kinetic energy through gears, cams, cranks and shafts which allow wheels to move faster or slower. In an ancient clock, gears transform the speed of a rotating shaft so that it drives the second hand at one speed, the minute hand at 1/60 that speed, and the hour hand at 1/3600 that speed. Clockwork toy cars often use gears to make themselves race along at surprising speed.In clockwork devices, ............... transform the speed of a rotating ............... to drive wheels slower or faster..

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