1 /MSE 201 EXAM + QUESTIONS AND CORRECT ANSWERS / LATEST 2023/2024 2 /1.elastic deformation in a material: recovers when stress is removed
2.which of the four elastic constants relates longitudinal strain to transverse strain: poissons ratio
3.plastic deformation in metals: occurs when dislocations move along slip planes
4.which of the following is not true regarding the concept of toughness in a material: hardening of a metal will increase its toughness
5.during which stage does the strain rate during creep follow an Arrhenius behavior: secondary
6.from a table how do you tell which metal is the most ductile: highest % elongation
7.from a table how do you tell which metal has the highest strength: add together yield and tensile strength
8.from a table how do you tell which metal has the highest stiffnness: highest youngs modulus
9.from a table how do you tell which metal would be the hardest: highest fracture toughness
10.on a stress strain curve; finnd yield strength: Take the linear section of the graph.
Draw a line parallel to it that passes through the strain axis at (e.g.) 0.2 % strain. Continue the line up until it reaches the stress - strain line.
Thee stress at which the two lines cross is the 0.2 % offsset yield point.
11.on a stress strain curve;
the youngs modulus: =(stress/strain) --- on the linear section
12.finnd poissons ratio: u=Et/El --- Et=(delta axial)/orginal axial--------El=(deltalongti-
tudinal)/orginal long.
2.which of the four elastic constants relates longitudinal strain to transverse strain: poissons ratio
3.plastic deformation in metals: occurs when dislocations move along slip planes
4.which of the following is not true regarding the concept of toughness in a material: hardening of a metal will increase its toughness
5.during which stage does the strain rate during creep follow an Arrhenius behavior: secondary
6.from a table how do you tell which metal is the most ductile: highest % elongation
7.from a table how do you tell which metal has the highest strength: add together yield and tensile strength
8.from a table how do you tell which metal has the highest stiffnness: highest youngs modulus
9.from a table how do you tell which metal would be the hardest: highest fracture toughness
10.on a stress strain curve; finnd yield strength: Take the linear section of the graph.
Draw a line parallel to it that passes through the strain axis at (e.g.) 0.2 % strain. Continue the line up until it reaches the stress - strain line.
Thee stress at which the two lines cross is the 0.2 % offsset yield point.
11.on a stress strain curve;
the youngs modulus: =(stress/strain) --- on the linear section
12.finnd poissons ratio: u=Et/El --- Et=(delta axial)/orginal axial--------El=(deltalongti-
tudinal)/orginal long.
