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ME Quiz - Test 4
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Gravity
Key Concepts:
Terms in this set (50)
allowable stress
In a specification schedule is used when the pipe specified as "schedule 80", the pipe corresponds to the
28 to 31
The modulus of elasticity for ordinary steel usually falls between _______ million pounds per square inch.
Stiffness
The modulus of elasticity is measure of
Tension
The modulus of elasticity for most metals in compression is usually taken as that in
Section modulus
The ratio of moment and stress is called
zero
For a symmetrical cross-section beam the flexural stress is ______ when the vertical shear is maximum
Approximately the same
When tested in compression, ductile materials usually exhibit _______ characteristics up to the yield strength as they do when tested in tension.
Fatigue failures
It has been said that 80% of the failures of machine parts have been due to
0.23 to 0.65
Cazand quotes values for steel showing Sn/Su ratios often called endurance ratio, from
Stress raiser
The discontinuity or change of section, such as scratches, holes, bends, or groove is a
Stress concentration factor
The degree of stress concentration is usually indicated by the
Residual stress
In a part at uniform temperature and not acted upon by an external load, any internal stress that exists is called:
Initial stress
The stress or load induced by the tightening operation.
Buckling
A type of failure due to instability is known as
Slenderness ratio
The ratio of the length of the column and the radius of gyration of the cross-sectional area about a centroidal axis called
Euler's formula
Formula that applies to a very slender column is called
Uniaxial
If two principal stresses are zero, the state stress is
Biaxial
If one principal stress is zero, the state stress is
Triaxial
If all the principal stresses have finite values, the system is
Yield stress / factor of safety
Under theories of failure for static loading of ductile material, the design stress is the
Half
Under theories of failure, the value of shear stress is ______ that of tensile stress.
The same
The theory of mechanics of materials shows that the results from the octahedral shear stress theory and those from the maximum distortion energy theory are _______.
Shearing stress
A kind of stress that is caused by forces acting along or parallel to the area is called
Stress
Obtained by dividing the differential load dF by the dA over which it acts.
Ultimate strength
The highest ordinate in the stress-strain diagram or curve is called
Couple
A pair of forces equal in magnitude opposite in direction, and not in the same line is called
Truss
Framework composed of member joined at their ends to form a rigid structure in known as:
Young modulus
The ratio of the tensile stress to the tensile strain is called
Bulk modulus
The ratio of the volume stress to the volume strain is called the coefficient of volume elasticity or
Its magnitude, Direction of its action , & Point of application
The action of a force is characterized by
Shear is zero
At highest and lowest point on the moment diagram
An axial load , A traverse load, & A bending moment
The built-in or fixed support is capable of supporting
Modulus of rigidity
The modulus of elasticity in shear is commonly called
Elastic limit
The stress beyond which the material will not return to its original shape when unloaded, but will retain a permanent deformation is termed as
Working stress
Refers to the actual stress the material has when under load
4890 kg per sq. cm
The safe soil bearing pressure of diesel engine is about
5
The machine foundation must have a factor of safety of
Actual stress
The load acts over a smaller area, and the _______ continues to increase unit failure.
Yield strength
In the stress-strain diagram where there is large increase in strain with little or no increase in stress is called:
Beam
A _______ member that carries loads transverse to its axis
Static load
Which type of load that is applied slowly and is never removed?
Random loading
When varying loads are applied that are not regular in their amplitude, the loading is called
Design factor
A measure of the relative safety of a load carrying component is termed as
Stress concentration factor
The condition, which causes actual stresses in machine members to be higher than nominal values predicted by the elementary direct and combined stress equations.
Design stress
The stress value, which is used, in the mathematical determination of the required size of the machine member.
0.25 to 0.27
Typical values for Poisson's ratio of cast iron is the range of
0.27 to 0.30
Typical values for Poisson's ration of steel is the range of
0.30 to 0.33
Typical values for Poisson's ration of aluminum and titanium is in the range of
Principal plane
The angle of inclination of the planes on which the principal stresses act is called.
Distortion energy theory
_________ provides a very accurate prediction of failure if ductile materials under static loads or completely reversed normal, shear or combined stresses.
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