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17.5: Stress on an Oblique Plane

JoVE Core
Mechanical Engineering

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Stress on an Oblique Plane

17.5: Stress on an Oblique Plane

Understanding stress on an oblique plane under axial loading is pivotal in material mechanics. This analysis offers insight into a material's durability and strength, which is crucial for civil engineering and structural design. Axial loading refers to force application along the material's central axis, causing compression or elongation and leading to normal stress. Normal stress occurs when a force acts perpendicularly to the material's area, resulting in compressive or tensile stress. When the stress plane isn't perpendicular to the load, it's an oblique plane, and the stress state includes both normal and shearing stress. Shearing stress happens when the force acts parallel to the area, deforming the material shape without volume change.

Considering a two-force member subject to axial force P and examining a section at an angle θ to the normal plane, the stresses on this oblique plane can be divided into normal (F) and tangential (V) components. Dividing F and V by the section's area provides the average normal and shearing stresses. The plane's orientation significantly impacts the material's stress state. Depending on the plane's orientation, the same load can induce only normal stress or both normal and shearing stresses of equal magnitude. Such understanding is crucial for designing robust, efficient structures.

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