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Questions and Answers
What is the primary purpose of impact testing?
What is the primary purpose of impact testing?
- To measure an object's hardness
- To measure an object's resistance to low-rate loading
- To measure an object's ability to resist high-rate loading (correct)
- To measure an object's ductility
What does impact energy measure in a material?
What does impact energy measure in a material?
- Its toughness or resistance to fracture (correct)
- Its ductility
- Its hardness
- Its malleability
What occurs to the specimen at the notch when it absorbs energy?
What occurs to the specimen at the notch when it absorbs energy?
- It begins to undergo elastic deformation
- It begins to undergo plastic deformation (correct)
- It begins to fracture
- It begins to corrode
What is the common method of measuring impact energy?
What is the common method of measuring impact energy?
What is the typical size of a Charpy Test specimen?
What is the typical size of a Charpy Test specimen?
What is the shape of the notch in a V-notch?
What is the shape of the notch in a V-notch?
What is the radius of the base of a V-notch?
What is the radius of the base of a V-notch?
How is the impact energy calculated in a Charpy Test?
How is the impact energy calculated in a Charpy Test?
What type of materials can be tested using the Charpy Test?
What type of materials can be tested using the Charpy Test?
What happens to the specimen when it can absorb no more energy?
What happens to the specimen when it can absorb no more energy?
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Study Notes
Impact Testing
- Measures an object's ability to resist high-rate loading
- Evaluates material's toughness, i.e., resistance to fracture
Impact Energy
- Measures a material's toughness, or resistance to fracture
- Absorbed energy by a specimen until it yields, then undergoes plastic deformation
- Fracture occurs when the specimen can absorb no more energy
Methods of Measuring Impact Energy
- Charpy Test
- Izod Test
Charpy Test
- Most commonly used to evaluate relative toughness or impact toughness of materials
- Used for metals, polymers, ceramics, and composites
- Specimen dimensions: 55x10x10mm with a notch machined across one of the larger faces
- Two types of notches: V-notch (2mm deep, 45° angle, 0.25mm radius) or U-notch/keyhole notch (5mm deep, 1mm radius)
Determination of Charpy Impact Energy
- Calculated based on the difference between initial and final heights of the swinging pendulum
- Impact energy (E) = mgh1 - mgh2 = mg (h1 - h2)
- Energy unit: Joule (N.m)
- Key: tough materials absorb a lot of energy, brittle materials absorb little energy prior to fracture
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