एक अच्छी तरह से हीट-ट्रीटेड मैकेनिकल स्प्रिंग जो लोड हटाने के बाद अपने मूल आकार को वापस पा लेती है, किस पदार्थ के गुण का सबसे अच्छा उदाहरण है?

Consider the following statements: 1. The maximum stress at which a material fractures under a large number of stress reversals is called the endurance limit. 2. The absorption of energy at high stress without rupture is called toughness. Which of the above statements is/are correct?

Which mechanical property of a metal represents its ability to resist scratching, wear, abrasion, and penetration?