Residual Stresses

• They have more surface exposure per unit volume, the flange tips tend to cool faster than flange-to-web junctures.
• Similarly, Central portion of web tends to cool faster than junctures
• As a result, metal at junctures continues to contract as it cools after flange tips and web interior have cooled to temperature of surroundings.
• This contraction is partially restrained by cooler metal.
• Developing tensile stresses in regions of junctures & compressive stresses in remainder.
• These are called residual Stresses
• Magnitude and distribution of thermal residual stresses are influenced to considerable degree by geometry of x-section
• 20 W
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