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Definition. Generally speaking, curves representing the relationship between stress and strain in any form of deformation can be regarded as stress–strain curves. The stress and strain can be normal, shear, or mixture, and can also can be uniaxial, biaxial, or multiaxial, even change with time.
An object or medium under stress becomes deformed. The quantity that describes this deformation is called strain. Strain is given as a fractional change in either length (under tensile stress) or volume (under bulk stress) or geometry (under shear stress). Therefore, strain is a dimensionless number.
A graphical method known as the “Consid`ere construction” uses a form of the true stress- strain curve to quantify the differences in necking and drawing from material to material. This method replots the tensile stress-strain curve with true stress \(\sigma_t\) as the ordinate and extension ratio \(\lambda = L/L_0\) as the abscissa.
Learn how to define and measure stress and strain in materials, and how they relate to the elastic modulus. Explore examples of stress and strain in different situations, such as a stretched spring, a compressed gas, and a bent beam.
1 de jun. de 2020 · Stress is the force per cross-sectional area that a material withstands. Strain is the percent change in the length of the material. The stress-strain curve is the simplest way to describe the mechanical properties of the material.
Stress & strain. Google Classroom. About. Transcript. To measure the elasticity of any material we need to define two quantities. Stress and strain. In this video let's explore what these are and why we define them? Created by Mahesh Shenoy. Questions. Tips & Thanks. Want to join the conversation? Log in. Sort by: Top Voted. Ashrita Das.
Strain is the ratio of change in length to the original length, when a given body is subjected to some external force (Strain= change in length÷the original length).
