Stress Strain Curve

Step 1: Understanding the Concept:
In a stress-strain curve, the distance between ultimate strength (maximum stress) and fracture point indicates plastic deformation.

Step 2: Detailed Explanation:
1. Ductile materials — undergo large plastic deformation before fracture. Ultimate strength and fracture points are far apart.
2. Brittle materials — fracture soon after elastic limit, points are close.
3. Perfectly elastic — no plastic region.
4. Non malleable — cannot be hammered into sheets.
5. Very hard — resists indentation.

Step 3: Final Answer:
The material is ductile.