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Questions and Answers
What is the purpose of the 'charpy' and 'izod' tests?
Why will a brittle material absorb little energy during an impact test?
When will a tough material show a decrease in toughness according to the text?
What is the main difference between a brittle material and a tough material in terms of energy absorption during an impact test?
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How does the swing of the pendulum change depending on the toughness of the tested material?
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Which of the following statements about the Rockwell Hardness Test is NOT true?
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According to the information provided, which of the following materials would likely have a higher Rockwell B (RB) value?
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Which of the following statements about hardness testing on aircraft is true?
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Based on the information provided, which of the following statements is correct regarding the relationship between Brinell, Vickers, and Rockwell hardness values?
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According to the information provided, which of the following statements is true regarding the correlation between hardness and ultimate tensile strength (UTS)?
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Study Notes
Impact Testing
- Designed to determine the toughness of a material
- Two types most commonly used: Charpy and Izod tests
- Both tests use notched bar test pieces of standard dimensions, struck by a fast moving, weighted pendulum
- Energy absorbed by the test piece on impact measures toughness
- Brittle materials break easily, absorbing little energy, and have a small impact on the pendulum swing
- Tough materials absorb considerable energy, greatly reducing the pendulum swing
Rockwell Hardness Test
- Uses indentation as its basis
- Two types of indenter: conical diamond indenter for hard materials and steel ball for soft materials
- Hardness number using steel ball is referred to as Rockwell B (e.g. RB 80)
- Hardness number using diamond indenter is referred to as Rockwell C (e.g. RC 65)
- Rockwell values are based on the depth of indentation, unlike Brinell and Vickers hardness values based on the area of indentation
Hardness and Ultimate Tensile Strength (U.T.S.)
- Good correlation between hardness and U.T.S. on some materials (e.g. steels)
- Certain materials may reduce their toughness at low temperatures
Hardness Testing on Aircraft
- Not normal to use Brinell, Rockwell, or Vickers testing methods on aircraft in the hangar
- Portable hardness testers can be used to test material hardness on items such as aircraft wheels after an overheat condition
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Description
Learn about the Rockwell Hardness Test which uses two types of indenters - a conical diamond for hard materials and a steel ball for soft materials. Understand how to differentiate between Rockwell B (RB) and Rockwell C (RC) hardness numbers.
