Calculation of Permanent set out of stress strain relation

In summary, to find the permanent set of a round bar with a diameter of 10mm and a length of 3mm, apply stress and measure the resulting strain, then use the equation provided.
  • #1
m.junaidjawaid
1
0
Hi,
I have been given a relation between stress and strain which is
strain=(stress/70000)(1+(3stress/(1890))
the dia of round bar is 10mm and length is 3mm and that's all the data i have and I am required to find out permanent set.
 
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  • #2
How do i go about it?The permanent set can be determined by applying a certain amount of stress to the round bar and then measuring the change in length. The change in length can then be divided by the original length to calculate the strain. The strain can then be used to calculate the permanent set using the given equation.
 

FAQ: Calculation of Permanent set out of stress strain relation

What is permanent set in stress strain relation?

The permanent set in stress strain relation refers to the amount of deformation or elongation of a material that remains even after the applied stress or force has been removed. It is a measure of the material's ability to return to its original shape after being subjected to stress.

How is permanent set calculated?

Permanent set is calculated by measuring the total deformation or elongation of a material after the applied stress has been removed. This can be done by using a strain gauge or by visually measuring the change in length of the material. The permanent set is then expressed as a percentage of the original length of the material.

What factors can affect the permanent set of a material?

The permanent set of a material can be affected by various factors such as the type and amount of stress applied, the temperature, and the duration of the stress. Additionally, the material's composition and microstructure can also play a role in determining its permanent set.

Why is the calculation of permanent set important?

The calculation of permanent set is important in understanding the behavior and properties of a material under stress. It can help engineers and scientists determine the suitability of a material for a specific application and make necessary adjustments to prevent excessive permanent deformation.

How can the permanent set of a material be reduced?

The permanent set of a material can be reduced by using materials with higher strength and stiffness, avoiding high stress or strain rates, and controlling the temperature and duration of the stress. Additionally, proper design and maintenance can also help reduce the permanent set of a material.

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