BME 350 QUIZ 4 UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
Question:
1. failure analysis is the systematic study of various modes
of material failure. why is it important that materials
engineers analyze failed materials?
Answer:
- the results of failure analysis provide materials engineers with valuable
information often available no where else
- materials engineers learn how to make materials that perform better
- it is a means by which material engineers learn from their mistakes so that these
mistakes are not repeated
Question:
2. what are mechanisms by which material can fail
Answer:
- single application of stress that exceeds the strength of the material
- multiple applications of stress each at an amplitude below the maximum stress
bearing level
- single application of high amplitude stress to a material with physical
imperfections (cracks, voids, air bubbles, etc)
Question:
3. what does the Charpy test measure?
Answer:
maximum high strain rate load bearing of a metal
Question:
4. the Charpy test measures the impact resistance of ____ and
the Izod test measures the impact resistance of ____
Answer:
metals, polymers
, Question:
5. testing the material properties of a speciment requires
the specimen must be precisely machined and the
dimensions of the gauge section known. this is especially
important for Charpy testing of metals where the
machined section includes a _____
Answer:
notch
Question:
6. how do materials engineers quantify the toughness of a
material?
Answer:
area under the stress strain curve
Question:
7. metals with a _____ unit cell crystal structure behave
differently in Charpy testing than do metals with a _____
unit cell structure
Answer:
BCC, FCC
Question:
8. the reason why BCC metals behave differently in Charpy
testing versus FCC metals is that _____ occurs in BCC
metals on ____
Answer:
slip, non-close packed planes
Question:
9. BCC metals show dramatic variation in fracture mode
with temperature. they fail in ___ mode at low temperature
and ____ mode at higher temperature
Answer:
brittle, ductile
Question:
10. BCC metals show dramatic variation in fracture mode
with
Answer:
temperature
CORRECT ANSWERS
Question:
1. failure analysis is the systematic study of various modes
of material failure. why is it important that materials
engineers analyze failed materials?
Answer:
- the results of failure analysis provide materials engineers with valuable
information often available no where else
- materials engineers learn how to make materials that perform better
- it is a means by which material engineers learn from their mistakes so that these
mistakes are not repeated
Question:
2. what are mechanisms by which material can fail
Answer:
- single application of stress that exceeds the strength of the material
- multiple applications of stress each at an amplitude below the maximum stress
bearing level
- single application of high amplitude stress to a material with physical
imperfections (cracks, voids, air bubbles, etc)
Question:
3. what does the Charpy test measure?
Answer:
maximum high strain rate load bearing of a metal
Question:
4. the Charpy test measures the impact resistance of ____ and
the Izod test measures the impact resistance of ____
Answer:
metals, polymers
, Question:
5. testing the material properties of a speciment requires
the specimen must be precisely machined and the
dimensions of the gauge section known. this is especially
important for Charpy testing of metals where the
machined section includes a _____
Answer:
notch
Question:
6. how do materials engineers quantify the toughness of a
material?
Answer:
area under the stress strain curve
Question:
7. metals with a _____ unit cell crystal structure behave
differently in Charpy testing than do metals with a _____
unit cell structure
Answer:
BCC, FCC
Question:
8. the reason why BCC metals behave differently in Charpy
testing versus FCC metals is that _____ occurs in BCC
metals on ____
Answer:
slip, non-close packed planes
Question:
9. BCC metals show dramatic variation in fracture mode
with temperature. they fail in ___ mode at low temperature
and ____ mode at higher temperature
Answer:
brittle, ductile
Question:
10. BCC metals show dramatic variation in fracture mode
with
Answer:
temperature
