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History
Ultimate tensile strength
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Ultimate tensile strength is the maximum stress that a material can withstand while being stretched or pulled before breaking. In brittle materials, the ultimate tensile strength is close to the yield point, whereas in ductile materials, the ultimate tensile strength can be higher.
Two vises apply tension to a specimen by pulling at it, stretching the specimen until it fractures. The maximum stress it withstands before fracturing
Two vises apply tension to a specimen by pulling at it, stretching the specimen until it fractures. The maximum stress it withstands before fracturing is its ultimate tensile strength.
Round bar specimen after tensile stress testing
Round bar specimen after tensile stress testing
The "cup" side of the "cup–cone" characteristic failure pattern
The "cup" side of the "cup–cone" characteristic failure pattern
Some parts showing the "cup" shape and some showing the "cone" shape
Some parts showing the "cup" shape and some showing the "cone" shape
Stress (mechanics)
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In continuum mechanics, stress is a physical quantity that describes forces present during deformation. For example, an object being pulled apart, such as a stretched elastic band, is subject to tensile stress and may undergo elongation. An object being pushed together, such as a crumpled sponge, is subject to compressive stress and may undergo shortening. The greater the force and the smaller the cross-sectional area of the body on which it acts, the greater the stress. Stress has dimension of force per area, with SI units of newtons per square meter (N/m2) or pascal (Pa).
Residual stresses inside a plastic protractor are revealed by the polarized light.
Residual stresses inside a plastic protractor are revealed by the polarized light.
Roman-era bridge in Switzerland. The stone arches in the bridge are subject to compressive stresses.
Roman-era bridge in Switzerland. The stone arches in the bridge are subject to compressive stresses.
Inca bridge on the Apurimac River. The rope in the bridge is subject to tensile stresses.
Inca bridge on the Apurimac River. The rope in the bridge is subject to tensile stresses.
Glass vase with the craquelé effect. The cracks are the result of brief but intense stress created when the semi-molten piece is briefly dipped in wat
Glass vase with the craquelé effect. The cracks are the result of brief but intense stress created when the semi-molten piece is briefly dipped in water.