Stress and Strain
Stress is the defined as the restoring force acting on an object and strain is the change in the dimension of object with respect to the original dimension. We can say that stress is the cause and strain is the effect. The formula for strain is given as follows
Strain = (lf – li)/li
where,
- lf is the final length
- li is the initial length
Since, strain is ration of change is dimension to the original dimension, hence it has no units. We can also convert strain into percentage by multiplying the above formula with 100.
In the case of tensile stress, the strain will be positive as the body will elongate and the difference between the final and initial length will be positive from the above formula. But in case of compressive stress the strain will be negative as the body will get compressed and the final length will reduce making the difference of length in the above formula negative.
Strain is not only in terms of length, it cam also be in terms of area and volume. To calculate are and volume strain we just need to replace length by area or volume as per our need in the above formula.
The relation between Stress and Strain is determined by Hooke’s Law which is discussed below:
What is Stress?
Stress in physics is defined as the force exerted on the unit area of a substance. Stress affects the body as strain in which the shape of the body changes if the stress is applied and sometimes it gets permanently deformed. On the basis of the direction of force applied to the body, we can categorize stress into three categories that include,
- Longitudinal Stress
- Bulk Stress
- Shearing Stress
Apart from these three, there are also other types of stress that we will learn in this article. In this article, we will also learn about what is stress, the types of stress, the Formula for stress, the unit of stress, and others in detail.
Table of Content
- What is Stress?
- Stress Formula
- Units of Stress
- Types of Stress
- Stress and Strain
- Hooke’s Law
Contact Us