# Optical determination of young's modulus.

• Lizwi
In summary, the Young's modulus is a measure of a material's stiffness and can be determined optically using a technique called photoelasticity. This method has advantages such as non-destructiveness and higher accuracy, but it is limited to transparent or translucent materials and can be affected by certain factors.
Lizwi
This equation is for calculating what and how was it obtained.
E=6(mg/bt3)Rs

Last edited:
Looks to me like you need to be reading a textbook about this. Your Post is to 'terse' for any useful response. Also, that formula means nothing until the variables are defined but they probably would be defined in the document you obtained it. Try reading that document and some others then we can have a meaningful discussion.

## 1. What is the Young's modulus?

The Young's modulus, also known as the modulus of elasticity, is a measure of the stiffness of a material. It describes the relationship between stress (force per unit area) and strain (deformation) in a material under tension or compression.

## 2. How is the Young's modulus determined optically?

The Young's modulus can be determined optically by using a technique called photoelasticity. This involves applying polarized light to a material and observing the patterns of light that form as the material is subjected to stress. The amount of stress can then be calculated using known principles of physics and the Young's modulus can be determined.

## 3. What are the advantages of using optical methods for determining Young's modulus?

One of the main advantages of using optical methods is that they are non-destructive, meaning the material being tested is not damaged in the process. Additionally, optical methods can provide more accurate and precise measurements compared to traditional mechanical methods.

## 4. What materials can be tested using optical determination of Young's modulus?

Most solid materials, including metals, plastics, and composites, can be tested using optical determination of Young's modulus. However, the material must be transparent or translucent enough for light to pass through and form a visible pattern.

## 5. Are there any limitations to using optical methods for determining Young's modulus?

One limitation of optical methods is that they are typically only applicable to materials that can withstand a certain amount of stress. Additionally, the accuracy of the results can be affected by factors such as surface roughness and the presence of impurities in the material.

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