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5.0
Matsci Exam 3- HW Questions with Detailed Verified
Answers (100% Correct Answers) /Already Graded
A+
Quiz: According to the tensile test graph shown, which of the following
statements is TRUE?
a). The yield strength is ~ 60 MPa and the ultimate tensile strength is ~
170 MPa.
b). The ultimate tensile strength is ~ 170 MPa and the Young's modulus is
~60 GPa.
c). The ultimate tensile strength is ~ 170 MPa and the Young's modulus
cannot be estimated.
d). The fracture strength is ~ 150 MPa and the ultimate tensile strength is
~ 150 MPa.
Ans: The ultimate tensile strength is ~ 170 MPa and the Young's modulus is
~60 GPa.
Quiz: Concrete can take up to ~26 MPa of compressive stress. The
density of concrete is about 2.2 g/cm³. What is the height limit (in the
unit of km) of a vertical concrete pillar to avoid exceeding the
maximum compressive stress due to its own weight? For the
acceleration of gravity use g=9.8 m/s².
18:36:59
,a). 1.57
b) 1.33
c). 1.45
d). 1.21
Ans: 1.21
Quiz: A polycrystalline copper sample is loaded past its yield point to
1.5% tensile strain, then the load is released. We call this sample the
"pre-stretched sample." We now reload this pre-stretched sample to a
1.0% tensile strain. Which of the following statements is correct?
a). The new yield strength of the pre-stretched sample is higher than
that of the original sample.
b). The yield strengths will be the same in both cases.
c). The new yield strength of the pre-stretched sample is lower than that
of the original sample.
d). Copper is brittle and cannot be strained a second time.
Ans: The new yield strength of the pre-stretched sample is higher than that
of the original sample
Quiz: Figure shown is a stress vs. strain curve for a FCC metal specimen.
The figure on the right is magnified to show the low strain behavior.
Estimate the yield stress (σYS) in MPa using the 0.2% offset method.
Examstudy - Stuvia US
,a). 75
b). 68
c). 55
d). 60
Ans: 68
Quiz: Figure shown is a stress vs. strain curve for a cylindrical FCC metal.
The figure on the right is magnified to show the low strain behavior.
Estimate the elastic modulus (E) in GPa?
a). 60
b). 0.103
c). 75
d). 7.5
Ans: 75
Quiz: The stress-strain curves A-C below were obtained from different
polymers in uniaxial tension at room temperature (25˚C). Which of the
following is true
a). The relative order of elastic moduli are A ~ B < C
Examstudy - Stuvia US
, b). The elastic moduli of A and B are almost identical with a value of ~3
GPa
c). The elastic moduli of A and B are almost identical with a value of
~300 MPa
d). A and B have elastic moduli of ~62 MPa and ~35 MPa, respectively.
Ans: The elastic moduli of A and B are almost identical with a value of ~300
MPa
Quiz: Which of the following statements is TRUE?
a). Toughness is directly proportional to the yield stress.
b). Toughness can be obtained from the area under the elastic portion
of the stress strain curve.
c). Toughness can be obtained from the area under the interatomic
energy versus distance curve.
d). Toughness can be obtained from the area under the entire stress
strain curve.
Ans: Toughness can be obtained from the area under the entire stress strain
curve
Quiz: If 100.0 MPa is applied along [001] in a FCC crystal, the resolved
shear stress magnitude for the slip system (in MPa) is
Examstudy - Stuvia US
In today's fast-paced educational landscape, students need reliable resources to excel in their studies.
5.0
Matsci Exam 3- HW Questions with Detailed Verified
Answers (100% Correct Answers) /Already Graded
A+
Quiz: According to the tensile test graph shown, which of the following
statements is TRUE?
a). The yield strength is ~ 60 MPa and the ultimate tensile strength is ~
170 MPa.
b). The ultimate tensile strength is ~ 170 MPa and the Young's modulus is
~60 GPa.
c). The ultimate tensile strength is ~ 170 MPa and the Young's modulus
cannot be estimated.
d). The fracture strength is ~ 150 MPa and the ultimate tensile strength is
~ 150 MPa.
Ans: The ultimate tensile strength is ~ 170 MPa and the Young's modulus is
~60 GPa.
Quiz: Concrete can take up to ~26 MPa of compressive stress. The
density of concrete is about 2.2 g/cm³. What is the height limit (in the
unit of km) of a vertical concrete pillar to avoid exceeding the
maximum compressive stress due to its own weight? For the
acceleration of gravity use g=9.8 m/s².
18:36:59
,a). 1.57
b) 1.33
c). 1.45
d). 1.21
Ans: 1.21
Quiz: A polycrystalline copper sample is loaded past its yield point to
1.5% tensile strain, then the load is released. We call this sample the
"pre-stretched sample." We now reload this pre-stretched sample to a
1.0% tensile strain. Which of the following statements is correct?
a). The new yield strength of the pre-stretched sample is higher than
that of the original sample.
b). The yield strengths will be the same in both cases.
c). The new yield strength of the pre-stretched sample is lower than that
of the original sample.
d). Copper is brittle and cannot be strained a second time.
Ans: The new yield strength of the pre-stretched sample is higher than that
of the original sample
Quiz: Figure shown is a stress vs. strain curve for a FCC metal specimen.
The figure on the right is magnified to show the low strain behavior.
Estimate the yield stress (σYS) in MPa using the 0.2% offset method.
Examstudy - Stuvia US
,a). 75
b). 68
c). 55
d). 60
Ans: 68
Quiz: Figure shown is a stress vs. strain curve for a cylindrical FCC metal.
The figure on the right is magnified to show the low strain behavior.
Estimate the elastic modulus (E) in GPa?
a). 60
b). 0.103
c). 75
d). 7.5
Ans: 75
Quiz: The stress-strain curves A-C below were obtained from different
polymers in uniaxial tension at room temperature (25˚C). Which of the
following is true
a). The relative order of elastic moduli are A ~ B < C
Examstudy - Stuvia US
, b). The elastic moduli of A and B are almost identical with a value of ~3
GPa
c). The elastic moduli of A and B are almost identical with a value of
~300 MPa
d). A and B have elastic moduli of ~62 MPa and ~35 MPa, respectively.
Ans: The elastic moduli of A and B are almost identical with a value of ~300
MPa
Quiz: Which of the following statements is TRUE?
a). Toughness is directly proportional to the yield stress.
b). Toughness can be obtained from the area under the elastic portion
of the stress strain curve.
c). Toughness can be obtained from the area under the interatomic
energy versus distance curve.
d). Toughness can be obtained from the area under the entire stress
strain curve.
Ans: Toughness can be obtained from the area under the entire stress strain
curve
Quiz: If 100.0 MPa is applied along [001] in a FCC crystal, the resolved
shear stress magnitude for the slip system (in MPa) is
Examstudy - Stuvia US
