EMA4223 Exam 1

For common engineering materials the true stress in

tension is always _ than the engineering stress.

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.

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)

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

Draw a representation of the Ultimate Tensile Strength on this graph. How would it be calculated?

Answer explanation

Maximum point of graph (stress value)

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

Draw a representation of the resilience on this graph. How would it be calculated?

Answer explanation

area under graph of linear elastic region

Draw a representation of the toughness on this graph. How would it be calculated?

Answer explanation

area under graph until endpoint

What is the stiffest direction in a cubic single crystal?

Elastic means a deformation is both _ and _.