Effect of heating on toughness (impact energy capacity) When a metallic material is heated, how does its toughness generally change? Choose the correct trend.
Mechanical Engineering
Machine Design
Difficulty: Easy
Choose an option
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AIncreases
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BDecreases
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CRemains unchanged
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DFirst increases, then decreases
Answer
Correct Answer: Increases
Explanation
ConceptToughness reflects the ability to absorb energy before fracture (area under the stress–strain curve). For most ductile metals, increasing temperature reduces brittleness and increases ductility, so impact energy and toughness rise with heating (within typical service ranges).
Final AnswerIncreases