Question

Stretcher strains found in a low carbon sheet are associated with

• A. Thickness of the sheet
• B. Texture
• C. Dislocation density
• D. Yield point phenomenon

Hint:

Luders bands or stretcher strains are surface markings in low carbon steels caused by the yield point phenomenon and are visible during early plastic deformation.

Answer 1

The Correct Option is D

Step 1: Understanding stretcher strains Stretcher strains, also called Luders bands, are visible surface deformations in low carbon steel sheets that occur during plastic deformation. Step 2: Link with yield point phenomenon These strains are directly associated with the sudden yielding that occurs in materials exhibiting a yield point phenomenon. As the material deforms beyond the upper yield point, dislocations are released in bands, causing localized stretching—stretcher strains. Conclusion: Stretcher strains are a manifestation of the yield point phenomenon in low carbon steels.