How will stress decrease after ultimate strength?
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At this yield point there is slight extension of the specimen occurs without increase in stress level. ... This part of stress strain curve is called hardening region.When the load reaches a maximum value, the engineering stress at this point is called the tensile strength or ultimate tensile strength of the material.
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We typically do not use materials in this stress-strain region. ... During necking, due to decrease in actual cross-sectional area, stress continues to increase. However, if stress is calculated on the original cross-sectional area (nominal curve) then stress will appear to decrease.
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