College Physics II – Mechanics, Sound, Oscillations, and Waves
Definition
Tensile stress is the internal force per unit area that resists elongation or stretching in a material when an external force is applied. It is calculated as the force divided by the cross-sectional area perpendicular to the force.
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Tensile stress is measured in Pascals (Pa) or Newtons per square meter (N/m^2).
The formula for tensile stress is $\sigma = \frac{F}{A}$ where $\sigma$ is the tensile stress, $F$ is the applied force, and $A$ is the cross-sectional area.
Materials can only withstand a certain amount of tensile stress before they deform permanently or fracture.
Tensile strength refers to the maximum amount of tensile stress that a material can handle before breaking.
Young's modulus, also known as the elastic modulus, relates tensile stress to tensile strain in a linear elastic material.
Review Questions
What units are used to measure tensile stress?
How do you calculate tensile stress given force and cross-sectional area?
What happens to a material when it exceeds its tensile strength?