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Questions and Answers
A steel rod is subjected to a tensile force. Which of the following best describes the relationship between stress and strain within the elastic region?
A steel rod is subjected to a tensile force. Which of the following best describes the relationship between stress and strain within the elastic region?
- Stress is inversely proportional to strain.
- Stress is independent of strain.
- Stress is proportional to strain. (correct)
- Stress is proportional to the square of the strain.
A cylindrical concrete column is subjected to an axial compressive load. If the load is increased, what happens to the axial stress and lateral strain?
A cylindrical concrete column is subjected to an axial compressive load. If the load is increased, what happens to the axial stress and lateral strain?
- Axial stress increases, and lateral strain decreases.
- Axial stress increases, and lateral strain increases. (correct)
- Axial stress remains constant, and lateral strain remains constant.
- Axial stress decreases, and lateral strain increases.
A metal wire of original length $L$ and cross-sectional area $A$ is stretched by a force $P$. If the modulus of elasticity of the wire is $E$, what is the elongation $\delta$ of the wire?
A metal wire of original length $L$ and cross-sectional area $A$ is stretched by a force $P$. If the modulus of elasticity of the wire is $E$, what is the elongation $\delta$ of the wire?
- $\delta = \frac{AE}{PL}$
- $\delta = \frac{EL}{PA}$
- $\delta = \frac{PA}{EL}$
- $\delta = \frac{PL}{AE}$ (correct)
A simply supported beam is subjected to a bending moment. Where is the bending stress the greatest?
A simply supported beam is subjected to a bending moment. Where is the bending stress the greatest?
A material has a yield strength of 300 MPa and an ultimate tensile strength of 450 MPa. What does the yield strength represent?
A material has a yield strength of 300 MPa and an ultimate tensile strength of 450 MPa. What does the yield strength represent?
A square metal bar is subjected to a torque about its longitudinal axis, which induces what kind of stress in the material?
A square metal bar is subjected to a torque about its longitudinal axis, which induces what kind of stress in the material?
A steel cable is used to lift a heavy load. If the factor of safety for the cable is 3, what does this indicate?
A steel cable is used to lift a heavy load. If the factor of safety for the cable is 3, what does this indicate?
A material is heated uniformly. If the material is constrained from expanding, what type of stress will be induced in the material?
A material is heated uniformly. If the material is constrained from expanding, what type of stress will be induced in the material?
What is the significance of the area under the entire stress-strain curve?
What is the significance of the area under the entire stress-strain curve?
A structure is considered statically indeterminate when:
A structure is considered statically indeterminate when:
Flashcards
Stress
Stress
Force acting on a unit area within a material, arising from external loads or self-weight.
Normal Stress
Normal Stress
Stress perpendicular to the surface.
Tensile Stress
Tensile Stress
Normal stress caused by a pulling or stretching force.
Compressive Stress
Compressive Stress
Stress caused by a force pushing or compressing the area.
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Shear Stress
Shear Stress
Occurs when a force acts parallel to the surface.
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Strain
Strain
Measure of deformation representing displacement between particles in a material.
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Normal Strain
Normal Strain
Change in length divided by the original length.
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Shear Strain
Shear Strain
Change in angle between two lines that were originally perpendicular.
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Hooke's Law
Hooke's Law
Stress is proportional to strain for elastic materials.
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Modulus of Elasticity
Modulus of Elasticity
Material property that measures stiffness; the ratio of stress to strain in the elastic region.
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