EMA4223 Exam 1
Authored by Mary Posadas
Science
University
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17 questions
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1.
FILL IN THE BLANK QUESTION
1 min • 1 pt
For common engineering materials the true stress in
tension is always _ than the engineering stress.
2.
FILL IN THE BLANK QUESTION
1 min • 1 pt
The sum of steps for the calculation for _ strain is the SAME as a one-step calculation.
The sum of steps for the calculation for _ strain is NOT the same as a one-step calculation.
3.
DRAW QUESTION
3 mins • 1 pt
Draw a representation of the Elastic Modulus (E) on this graph. How would it be calculated?
Answer explanation
Slope of linear fit: slope of the linear region of the graph (stress/strain)
4.
DRAW QUESTION
3 mins • 1 pt
Draw a representation of the Yield Strength on this graph. How would it be calculated?
Answer explanation
0.2% offset strain (0.002 from 0) -> parallel to linear elastic region -> point of intercept graph -> stress value at intercept
5.
DRAW QUESTION
3 mins • 1 pt
Draw a representation of the Ultimate Tensile Strength on this graph. How would it be calculated?
Answer explanation
Maximum point of graph (stress value)
6.
DRAW QUESTION
3 mins • 1 pt
Draw a representation of the % elongation at failure (aka ductility) on this graph. How would it be calculated?
Answer explanation
End of graph -> line parallel to yield strength offset/elastic region -> point of intercept on strain axis -> x100 for a % value
7.
DRAW QUESTION
3 mins • 1 pt
Draw a representation of the resilience on this graph. How would it be calculated?
Answer explanation
area under graph of linear elastic region
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