Question

b. On a tension test o vs ε plot, draw and label both “perfectly plastic" and "strain hardening plastic” behavior for o > 0. Which case is assumed in structural design, which is used in cold forming of ducts, corrugated metal sheets, reinforcing bars, and seamless tube? c. What document does a fabricator submit to show it is using the correct material? What sketches of Prob“b” components are submitted to show that contract plans are properly interpreted?

Answer 1

Peshitic ( b q F G No А 'Strain Hardening plastic. I - E O A Linear Curve А. Proportional Limit B Elastic limit (Upper yield point * Perfectly plastic case will be assumed in Structural design, when the structure design by plastic theory. D+ lower yield point BG- Plastic region DE + Perfectly plastic EF - strain handening region. FG - Necking Region F -- Ultimate stress point G-Foacture point *. Stouin Hardening plastic is used in cold forming of ducts, reinforcement bars , seamless tube etc. Stress - Stoain Curve of the material used and the loading Conditions which will act on that material: The sketch of perfectly plastic and storain Handening plastic are submitted to show that contract plans properly interpretedo are