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ME Quiz - Test 3
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Gravity
Key Concepts:
Terms in this set (50)
Factor of safety
The ratio of the ultimate stress to the allowable stress.
Maximum at the wall
In a cantilever beam with a concentrated load at the free end, the moment is
Bearing strength
The greatest unit pressure the soil can continuously withstand
It is elastic
A specimen is subjected to a load. When the load is removed the strain disappears. From this information, which of the following can be deducted about the material?
Has a reaction equal to the load
A cantilever beam having a uniformly increasing load toward the fixed end
Depends on the materials and the finish condition of the surface
The coefficient of friction for dry surfaces
Ultimate stress
The maximum stress to which a material may be subjected before failure
Stress
The total resistance that a material offers to an applied load
The square beam is more economical
If the areas of cross-section of square and circular beams are the same and both are put to equal bending moment then the correct statement is
Axial tension loads
Ties are load carrying member that carry
Prestressing thick cylinders
Autofrettage is the method of
Principal stress, Normal stress, & Tangential stress
Mohr's circle can be used to determine __________ on inclined surface.
Shear stress to shear strain
Modulus of rigidity can be defined as the ratio of
resilience
The total strain energy stored in a body is called
One third that of a prismatic bar of the same length
The elongation of a conical bar under its own weight is equal to
There is not such phenomenon like true stress or true strain
Which one is the incorrect statement about true stress-strain method
Maximum load during test / original cross-sectional area
The tensile stress of a material is given by
Compressive stress
When a part is constrained to move and heated, it develops what kind of stress?
One-half
For steel, the ultimate strength in shear as compared to in tension is nearly
Modulus of elasticity
The intensity of stress that causes unit strain is known as
More
The ultimate tensile stress of mild steel, as compared to its ultimate compressive stress will be
E = 2G(µ + 1)
The relation between modulus of elasticity E and modulus of elasticity in shear G, bulk modulus of elasticity K and Poisson's ratio is given by
Minimum or maximum
When shear force is zero along a section, the bending moment at that section will be
A sudden break
The stress-strain curve for a glass rod during tensile test is
3/4
The ratio of average shear stress to maximum shear stress for a circular
1
The ratio of bulk modulus to shear modulus for Poisson's ratio of 0.25 will be
Least radius of gyration
The compression members tend to buckle in the direction of
Proportional to the displacement of the material acted upon by the force
The stress in an elastic material is
Unsupported length to its least radius of gyration
The slenderness ratio of a column is generally defined as the ratio of its
Elastic range
Linear portion of the stress-strain diagram of steel is known as
Where the shearing stress is zero
Principal stresses occur on those planes
A measure of distance
The ratio of the moment of inertia of the cross-section of a beam to the section modulus is
Shearing stress
Structural steel elements subjected to torsion develop what kind of stress?
Sum of all the moments of all external forces on one side of the section
The bending moment of a section of a beamed is derived from the
Is a ratio of the average stress on a section to the allowable stress
The stress concentration factor
Unit lateral deformation to the unit longitudinal deformation
Poisson's ratio is the ratio of the
Stress = E (strain)
Hooke's law for an isotropic homogeneous medium experience one dimensional stress is known as
Defined as the unit shear stress divided by the unit shear deformation
The modulus of rigidity of a steel member is
ωL/8
The maximum bending moment of a beam simply supported at both ends and subject to a total load ω uniformly distributed over its length L is expressed by the formula
The length of the column
In a column (slenderness ratio >160), which of the following has the greatest influence on its tendency to buckle under a compressive load?
Change in moment between the two points
The area of the shear diagram if a beam between any two points on the beam is equal to the
Stress-strain relationships where stresses are applied in more than one direction
Poisson's ratio is principally used in
A measure of a materials ability to store strain energy
Modulus of resilience is
It is the stress at which the material plastically strains 0.2%
Which of the following best describes the 0.2% offset yield stress?
Creep
Under very low deformation and at high temperature it is possible to have some plastic flow in a crystal at a shear stress lower than the critical shear stress. What is this phenomenon called?
Offset yield stress
In a stress- strain diagram what is the correct term for the stress level at e = 0.20% offset?
Repeated load
Under which type of loading does fatigue occur?
It is elastic
A specimen is subjected to a load. When the load is removed, the strain disappears. From this information, which of the following can be deduced about this material?
0.45
Which of the following may be the Poisson ratio of a material?
long side
In pure torsion, the minimum torsional stress occurs at the
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