ME251 EXAM 1 QUESTIONS WITH
VERIFIED ANSWERS
A __________ material will fracture after a very small amount of deformation. -
ANSWER Brittle
__________ is a measure of the stiffness of a material. Materials with a high value
of this property will require a large amount of force per area (stress) to produce
a small amount of deflection (strain). - ANSWER Elastic Modulus : E=σ/ε
Which of the following are typical properties of metallic materials? (Select all
that apply) - ANSWER High electrical conductivity, High ductility, and High luster
Amount of energy per volume required to fracture the material. Energy
absorbed by the material before it fractures. (Area Under the stress-strain
curve) - ANSWER Toughness
• High Luster
• High Thermal Conductivity
• High Electrical Conductivity
• Highly Ductile - ANSWER Metals
• Wide Range of Properties
• Low Thermal Conductivity
• Low Electrical Conductivity
• Low Ductility
• Lower Strength (some) - ANSWER Nometals
Properties describing material response to applied force (Elastic Young's)
Modulus, strength, toughness, hardness, etc.) - ANSWER Mechanical Properties
Force is constant overtime - ANSWER Statics
, Force change over time - ANSWER Dynamics
Properties insensitive to structure which can be measured
without applying force [Density, thermal conductivity, color, electrical
conductivity, etc.] - ANSWER Physical Properties
Internal force per unit area within material - ANSWER Stress: σ=P/A
Change in size of a material compared to original dimenion - ANSWER Strain:
ε=ΔL/L
Positive strain - ANSWER Tensile stress
Negative strain - ANSWER Compressive stress
Distortion - ANSWER Shear stress
Static properties describe a material's behavior under a
constant force. These properties are determined
experimentally using - ANSWER Tensile Test
Point at which material
will not return to original
length when load is
removed - ANSWER Elastic Limit
Point at which material no
longer behaves linearly - ANSWER Proportional Limit
Permanent deformation
when the elastic limit is
exceeded - ANSWER Plastic Deformation
Difference between strain
when force is applied and
strain after force is
removed - ANSWER Springback
Point at which increases
in strain do not require
proportionate increases in
stress - ANSWER Yield Strength
Point at which load
bearing ability peaks and
VERIFIED ANSWERS
A __________ material will fracture after a very small amount of deformation. -
ANSWER Brittle
__________ is a measure of the stiffness of a material. Materials with a high value
of this property will require a large amount of force per area (stress) to produce
a small amount of deflection (strain). - ANSWER Elastic Modulus : E=σ/ε
Which of the following are typical properties of metallic materials? (Select all
that apply) - ANSWER High electrical conductivity, High ductility, and High luster
Amount of energy per volume required to fracture the material. Energy
absorbed by the material before it fractures. (Area Under the stress-strain
curve) - ANSWER Toughness
• High Luster
• High Thermal Conductivity
• High Electrical Conductivity
• Highly Ductile - ANSWER Metals
• Wide Range of Properties
• Low Thermal Conductivity
• Low Electrical Conductivity
• Low Ductility
• Lower Strength (some) - ANSWER Nometals
Properties describing material response to applied force (Elastic Young's)
Modulus, strength, toughness, hardness, etc.) - ANSWER Mechanical Properties
Force is constant overtime - ANSWER Statics
, Force change over time - ANSWER Dynamics
Properties insensitive to structure which can be measured
without applying force [Density, thermal conductivity, color, electrical
conductivity, etc.] - ANSWER Physical Properties
Internal force per unit area within material - ANSWER Stress: σ=P/A
Change in size of a material compared to original dimenion - ANSWER Strain:
ε=ΔL/L
Positive strain - ANSWER Tensile stress
Negative strain - ANSWER Compressive stress
Distortion - ANSWER Shear stress
Static properties describe a material's behavior under a
constant force. These properties are determined
experimentally using - ANSWER Tensile Test
Point at which material
will not return to original
length when load is
removed - ANSWER Elastic Limit
Point at which material no
longer behaves linearly - ANSWER Proportional Limit
Permanent deformation
when the elastic limit is
exceeded - ANSWER Plastic Deformation
Difference between strain
when force is applied and
strain after force is
removed - ANSWER Springback
Point at which increases
in strain do not require
proportionate increases in
stress - ANSWER Yield Strength
Point at which load
bearing ability peaks and
