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Stress-Strain Curve

DropDown Activity

s

Choose the correct alternatives

In the region between , the curve is linear,  Hooke’s law is obeyed

In the region from , Hooke’s law is not obeyed. But the the body still returns to its original dimension when stress is removed

In the region between , the body does not regain its original dimension. The deformation is said to be plastic deformation

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Refer above figure to choose the correct option

Question

Which point is the Proportional Limit

Hint

Hooke’s law is obeyed here. Stress and strain are proportional

Answers

Point A

Point B

Point C

Point D

Point E

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Question

Which point is the Fracture Point

Hint

Fracture occurs at this point

Answers

Point A

Point B

Point C

Point D

Point E

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Question

Which point is the ultimate tensile strength of the material

Hint

Beyond this point, additional strain is produced even by a reduced applied force

Answers

Point A

Point B

Point C

Point D

Point E

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Question

Which point  in the curve is known as yield point (elastic limit)

Hint

The corresponding stress is known as yield strength of the material

Answers

Point A

Point B

Point C

Point D

Point E

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Question

The material is said to have a permanent set, when the curve reaches the ________________

Hint

In this case, even when the stress is zero, the strain is not zero

Answers

Point A

Point B

Point C

Point D

Point E

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Ductile and Brittle Materials

Beyond ultimate tensile strength, the fracture occurs even by a reduced applied force

Question 1

If the ultimate strength and fracture points are close, the material is said to be brittle

Elastomers

Question

Substances like tissue of aorta, rubber etc are Elastomers. Select the correct options

Answers

Hooke’s law is not obeyed over most of the region

Plastic region region is well defined

They can be stretched to cause large strains

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