Cast iron is characterized by____________________?
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Answer: D. Its elastic limit very close to ultimate breaking strength
Explanation
The correct answer is that its elastic limit lies extremely close to its ultimate breaking strength. Because cast iron cannot deform plastically, elastic behavior continues right up to the point of catastrophic fracture. This narrow plastic deformation zone explains why cast iron exhibits virtually no warning before breaking under tension. Stress-strain curves for engineering materials illustrate the boundary between elastic deformation and permanent plastic flow. Ductile materials show a pronounced yield point followed by significant plastic elongation before final rupture. Brittle materials like cast iron lack this yielding phase, causing the ultimate tensile strength to coincide nearly with the elastic limit.
Option A is incorrect because cast iron possesses very low ductility and fractures without significant elongation. Option B is incorrect because cast iron is completely non-malleable and cannot be hammered or rolled into shape. Option C is incorrect because cast iron has a relatively low tensile strength compared to its high compressive strength.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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