Calculate the normal stress (σ) acting on a cross-sectional area under an axial load.
Normal stress (σ) is the internal force per unit area acting perpendicular to a surface. It is the most basic measure of how a material experiences a load.
When the force pulls on the material, it is called tensile stress. When the force pushes on the material, it is called compressive stress. Engineers use this value to determine if a component will fail under a given load by comparing it to the material's yield strength.
Where:
• σ (sigma) is the normal stress (Pa or N/mm²)
• F is the applied force (N)
• A is the cross-sectional area (m² or mm²)
While both are force per unit area, pressure usually refers to external forces acting on a surface (like air or water), while stress refers to internal forces within a solid material.
A Megapascal is one million Pascals. In engineering, 1 MPa is equivalent to 1 Newton per square millimeter (N/mm²), which is a very convenient unit for small components.
Shear stress (τ) is the force per unit area acting parallel to a surface, rather than perpendicular. It occurs when forces try to slide one part of a material over another.
Stress and strain are related by Hooke's Law (σ = Eε), where E is Young's Modulus. This relationship holds true as long as the material is in its elastic region.
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