Podcast
Questions and Answers
What is the purpose of the 'charpy' and 'izod' tests?
What is the purpose of the 'charpy' and 'izod' tests?
- To determine the strength of a material
- To assess the toughness of a material (correct)
- To measure the hardness of a material
- To evaluate the ductility of a material
Why will a brittle material absorb little energy during an impact test?
Why will a brittle material absorb little energy during an impact test?
- Because it has high ductility
- Because it is tough and strong
- Because it breaks easily (correct)
- Because it is resistant to temperature changes
When will a tough material show a decrease in toughness according to the text?
When will a tough material show a decrease in toughness according to the text?
- When the environmental temperature drops (correct)
- When subjected to impact tests
- When there is a sudden increase in temperature
- When exposed to high temperatures
What is the main difference between a brittle material and a tough material in terms of energy absorption during an impact test?
What is the main difference between a brittle material and a tough material in terms of energy absorption during an impact test?
How does the swing of the pendulum change depending on the toughness of the tested material?
How does the swing of the pendulum change depending on the toughness of the tested material?
Which of the following statements about the Rockwell Hardness Test is NOT true?
Which of the following statements about the Rockwell Hardness Test is NOT true?
According to the information provided, which of the following materials would likely have a higher Rockwell B (RB) value?
According to the information provided, which of the following materials would likely have a higher Rockwell B (RB) value?
Which of the following statements about hardness testing on aircraft is true?
Which of the following statements about hardness testing on aircraft is true?
Based on the information provided, which of the following statements is correct regarding the relationship between Brinell, Vickers, and Rockwell hardness values?
Based on the information provided, which of the following statements is correct regarding the relationship between Brinell, Vickers, and Rockwell hardness values?
According to the information provided, which of the following statements is true regarding the correlation between hardness and ultimate tensile strength (UTS)?
According to the information provided, which of the following statements is true regarding the correlation between hardness and ultimate tensile strength (UTS)?
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.
