Which statement accurately describes brittle fracture?

Which statement accurately describes brittle fracture?

• A. No warning prior to failure; sudden
• B. Requires large plastic deformation before failure
• C. Occurs at high temperatures with necking
• D. Brittle fractures lack warning but that's not always; no clear sign before failure

Answer: (A)

Brittle fracture is defined by a sudden break with little or no plastic deformation before failure, so there is essentially no warning before the part breaks. Once cracks initiate, they propagate rapidly, and yielding or necking is minimal or absent, leading to an abrupt failure. This is why the statement describing no warning prior to failure and a sudden break best fits brittle behavior. The other descriptions point to ductile fracture, where noticeable plastic deformation or necking occurs before failure, typically under higher temperatures or slower loading, which is not characteristic of brittle fracture. While real materials can show variations, the classic description emphasizes the abrupt nature and lack of prior warning.

Brittle fracture is defined by a sudden break with little or no plastic deformation before failure, so there is essentially no warning before the part breaks. Once cracks initiate, they propagate rapidly, and yielding or necking is minimal or absent, leading to an abrupt failure. This is why the statement describing no warning prior to failure and a sudden break best fits brittle behavior. The other descriptions point to ductile fracture, where noticeable plastic deformation or necking occurs before failure, typically under higher temperatures or slower loading, which is not characteristic of brittle fracture. While real materials can show variations, the classic description emphasizes the abrupt nature and lack of prior warning.