Solids Final Exam

Rewrite the units of Pa in terms of kg,m,s

(kg)/s^2m

A spherical gas-storage tank with an inside diameter of 438 in is being constructed to store gas under an internal pressure of 202 psi. The tank will be constructed from structural steel that has a yield strength of 21,782 psi. Determine the minimum wall thickness [in] required for the spherical tank. (Use three sig figs.)

1.02

According to the stress-strain diagram below _______ is the approximate proportional limit of stress.

55 ksi

What is true about the location of the center of Mohr's circle? Select all that apply. It is located at the point of average shear stress. It is located where shear stress is zero. It is located where plane stress is zero. It is located at the point of average normal stress. It is the same value as the radius of the circle.

??????Partial?????? It is located where shear stress is zero. It is located where plane stress is zero. It is located at the point of average normal stress.

According to the figure below, at which the point does the maximum bending stress occur. (Wall is A end is C and B is a size reduction in tube length)

A or B

_________________ are compressive normal stresses that occur on the surface of contacts between two separate interacting members.

Bending stress

For both axial and torsion members, the free body diagram approach is efficient for the determination of maximum normal and shear stresses.

False

Once buckling occurs, a relatively small increase in compressive force will produce a relatively large axial deflection, creating additional bending in the column.

False

Should one treat this problem as a thin walled pressure vessel? Circle Yes or No "An open-ended high-pressure steel [E = 200 GPa, ν = 0.3] tube for a boiler has an outside diameter of 273 mm and a wall thickness of 32 mm. The inside pressure in the boiler tube is p = 45 MPa."

No

The ratio of the lateral or transverse strain to the longitudinal or axial strain for a uniaxial state of stress is called

Poisson's ratio

_____________ is a moment that tends to twist a member about its longitudinal axis

Torque

_______________________ is a moment that tends to twist a member about its longitudinal axis.

Torque

If the shear stress acting on a face of the stress element tends to rotate the stress element in a _______ direction, then the shear stress is plotted above the normal stress axis.

clockwise

When a straight beam is loaded and the action is elastic, the longitudinal centroidal axis of the beam becomes a curve, which is termed the ______________________

elastic curve

According to the figure below, does the angle of twist on point H (increase/ decrease/ stay the same) when L increases. (H is on the edge of the tube on the end away from the wall where T occurs)

increase

Rewrite the units of Pa in terms of kg,m,s. ___________ .

kg m/(s2m2)

Rewrite the units for tension in terms of lbm,in,sec. _______________

lbm in/sec^2__or _lbm /sec^2/in

The stress-strain diagram below. E represents

modulus of elasticity

A shear stress is _______________ if it acts in the positive coordinate direction on a negative face of the stress element.

negative

The average ___________________ over the length of the bar is obtained by dividing the axial deformation of the bar by its initial length.

normal strain

Mohr's Circle: _____________ normal stresses are plotted on the right side of the τ axis, and ___________ normal stresses are plotted on the left side of the τ axis.

pos/tensile, neg/comp

A shear stress is _______________ if it acts in the negative coordinate direction on a negative face of the stress element.

positive

The _________________________ is the stress at which the stress-strain plot is no longer linear.

proportional limit

The allowable stress used in design calculations is found by dividing the failure stress by a

safety factor

An average _______________________________ associated with two reference lines that are orthogonal in the undeformed state can be obtained by dividing the shear by the perpendicular distance

shear strain

Thin-walled pressure vessels are classified as ____________ ___________.

shell-structures

The stress strain diagram below. The C region represents

strain hardening

The state of stress at a point is conveniently represented by stress components acting on an infinitesimally small cubic element of material known as a ___________ _____________.

stress-element

____________________________________ is a deformation plot which shows the relationship between stress and strain, called the.

stress-strain diagram

Three common methods for calculating beam deflections are presented here: (1) the integration method, (2) the use of discontinuity functions, and (3) the __________________ method.

superposition

When a bolt is tightened, the bolt is under what type of stress? ____________________

tensile

Axial forces that tend to elongate a member are termed _________ forces, and forces that tend to shorten a member are termed _________ forces.

tension, compression

Beams are usually long (compared with their cross‐sectional dimensions), straight, prismatic members that support __________________loads, which are loads that act perpendicular to the longitudinal axis of the member

transverse

The term _______________ refers to loads and sections that are perpendicular to the longitudinal axis of the member.

transverse

The Stress-Strain diagram below. A represents _____________

yield