Download Solution Manual for BRIAN’S Mechanical Engineering Design and more Exams Mechanical Engineering in PDF only on Docsity!
Solution Manual for BRIAN ’ S Mechanical
Engineering Design: 2024 Release ISE by
MUGO | from 4- 20 Chapters Covered
Chapter 4: Define elasticity. Ability for material to regain its shape after deformation. Chapter 4: How does a nonlinear softening spring behave? It behaves like a negative parabola, past a certain displacement, the force decreases. Chapter 4: Write the equation for force of a spring as a function of displacement. f = - kx Chapter 4: In beam theory, what are: q, V, M, theta, and y?
- q is distributed load.
- V is sheer force.
- M is bending moment.
- theta is slope of deflection.
- y is the displacement of deflection. Chapter 4: Shear is the integral of what? Distributed load. Chapter 4: How do you do beam deflection by superposition? You separate the loads, calculate their effects, and add the results. Chapter 4: True or False: Integrating a Macauley function with a negative exponent (x-a)^-2 uses standard calculus rules. Explain.
False, for singularity functions, you only add the exponent by one when "integrating". Chapter 4: If a distributed load only extends part way down a beam, how do you turn it off at the point where the load ends? Use the singularity functions starting at x = a towards x = b. Chapter 4: What is meant by statistically indeterminate? If there are more unknown support (reaction) forces and/or moments than number of static equilibrium equations. Chapter 4: What is the difference between impact and shock? Impact is the collision between 2 objects with initial relative velocity, and shock is a sudden applied force or disturbance. Chapter 4: What is the smallest possible shock as a function of applied force? F = 2W Chapter 5: What is a stress concentration? Localized increase of stress near discontinuities. Chapter 5: True or False: A smaller radius at a discontinuity result in lower stress. False Chapter 5: If there is static load on a ductile material, is stress concentration important? Why or why not? It's not important because the material behaves plastically.
Modified Mohr's cirlce. Chapter 5: For ductile materials, which theory matches experimental data best? Distortion Energy Theory Chapter 6: True or False: Stresses in fatigue failures are higher than yield strength? False Chapter 6: Are fatigue failures due to material properties changing? No Chapter 6: What is fatigue failure due to? Failure fatigue is when crack initiates and grows when subjects to many cycles. Chapter 6: Fatigue cracks typically start where? At stress concentrations. Chapter 6: What is a crack propagation? Crack propagation is the process of growth and extension of cracks. Chapter 6: At higher stress levels crack initiation is fast or slow? Fast Chapter 6: At lower stress levels, most of fatigue life is spent: a) nucleating a crack or b) growing the crack? Nucleating the crack.
Chapter 6: At low enough stress levels, is it possible that a crack forms or never grows? What is this called? It is possible, it's called infinite life. Chapter 7: Deflection of a shaft is primarily controlled by material or geometry? Geometry Chapter 7: Which is NOT a consideration for shaft layout?
- Axial layout of components
- Supporting axial loads
- Providing torque transmission
- Surface hardening Surface hardening Chapter 7: Ideally, should load-bearing components like gears and pulleys be between bearings or cantilevered on one side of the bearings? Between bearings Chapter 7: Which of the following is not used to transmit torque to a shaft?
- Keys
- Splines
- Setscrews
- Press fits
- Thrust bearings Thrust bearings
Chapter 8: If lowering torque is negative, is the screw self- locking? No Chapter 8: Acme threads are angled instead of square. Is the friction on Acme threads larger or smaller than square threads? Larger Chapter 8: What load is the maximum load that a bolt can withstand without acquiring a permanent set? Proof load Chapter 8: The first thread of a nut carries what part of the load? A. 38% B. 5% C. 1% 38% Chapter 10: Name one of the four functions of a spring.
- Absorb energy
- Exert force
- Provide a relationship between force and deflection
- Provide flexibility Chapter 10: In a helical spring, there are torsion and direct shear. Is there bending? No
Chapter 10: Write the equation for spring index C of a helical spring. Define the terms. C = D/d D is the coil diameter d is the wire diameter Chapter 10: What is the name of the process used in manufacturing a spring to induce residual stresses? Presetting Chapter 10: With small wire diameters, strength is a function of? Diameter Chapter 10: What is the preferred range for spring index? 4 ≤ C ≤ 12 Chapter 10: For a helical spring, the fundamental critical frequency should be how much greater that the frequency of the force or motion of the spring? 15 to 20 times. Chapter 10: What is it called when an extension spring has coils in contact with each other? Close wound Chapter 10: True or False: The coil of a torsion spring experiences bending stress. True
Chapter 11: Does lubrication in a bearing help to dissipate heat? Yes Chapter 11: Does lubrication in a bearing help to prevent corrosion? Yes Chapter 12: True or False: Hydrodynamic lubrication requires sufficient velocity to create pressure to separate the surfaces. True Chapter 12: Does hydrostatic lubrication require motion? No Chapter 12: True or False: Boundary lubrication is used when conditions do not provide a thick enough lubrication film for hydrodynamic lubrication. True Chapter 12: What kind of lubrication is used at extreme temperatures? Solid-film lubrication. Chapter 12: Does viscosity go up or down with increasing temperature? Down Chapter 12: True or False: Bearings in which warm lubricant stays within the bearing housing are called self-contained bearings.
True Chapter 12: In a pressure-fed bearing what can reduce temperature rise? Increased lubricant flow. Chapter 12: Relative motion between two surfaces with only a partial lubricant film (not hydrodynamic) is called what? (Give either one of the two correct answers.) Thin-film lubrication. Chapter 12: When can hydrodynamic lubrication be in thin- film mode? When some sort of "start-up" occurs. Chapter 13: What is a gearset? 2 meshed gears. Chapter 13: In a gearset, is the smaller gear called a 'wheel' or a 'pinion'? Pinion Chapter 13: What is backlash? Amount that tooth space exceeds thickness of engaging tooth. Chapter 13: If tooth profiles of mating gears give constant angular velocity they are called? Conjugate Chapter 13: What is the universal profile for conjugate teeth? Involute
False Chapter 14-15: True or False: Spur gears can be used on shafts that are not parallel. False Chapter 14-15: True or False: Helical gears cannot be used on parallel shafts. Flase Chapter 14-15: What gear types can be used on shafts that are not parallel? Name 2 of the 4.
- Bevel
- Worm
- Hypoid
- Spiroid Chapter 14-15: Which are quieter: spur gears or helical gears? Helical Chapter 14-15: Which gear type is easier to replace? Spur Chapter 14-15: Do helical gears usually have a contact ratio <= 1? No Chapter 14-15: What does a contact ratio greater than 1 mean? It means that contact with the next tooth starts before the current one loses contact.
Chapter 14-15: What type of helical gears do not produce axial thrust? Herringbone gears Chapter 14-15: When can meshing helical gears have the same 'hand' or tooth slant? When they're crossed axis. Chapter 14-15: What kind of gears are used when shaft axes intersect? Straight tooth bevel gears. Chapter 14-15: In a worm gearset, which is usually the driver, the worm or the worm wheel? Worm Chapter 14-15: What does a differential do? Allows power for both wheels when turning, and torque gets evenly split. Chapter 16: Clutches, brakes, couplings, and flywheels are associated with what? Rotation Chapter 16: In analyzing these components, name 2 of the 4 primary factors.
- Actuating force
- Torque transmitted
- Energy loss
- Temperature rise
Chapter 16: What kind of brakes are self-energized? Drum brakes Chapter 16: In a flywheel, when will the speed remain constant? When the net torque is zero. Chapter 17: Flexible mechanical elements are used to transmit _______ over longer distances. Power Chapter 17: True or False: Felxibility increases shock loads and vibrations. False Chapter 17: What kind of belts need to toothed pulley? Timing belts Chapter 17: What kind of belts have a friction surface on both sides? Flat belts Chapter 17: What two kinds of belts can be used on variable- speed drives? Flat belts and V belts. Chapter 17: What kind of belts are useful up to 700 degrees F? Flat metal belts Chapter 17: Which belts are more efficient: V belts or flat belts?
Flat belts Chapter 17: What flexible element as no slippage or creep, a long life, and can drive multiple shafts from a single source of power? Roller chain Chapter 17: What kind of belt is made of fabric and cord impregnated with rubber? V belts Chapter 17: Which lay of wire rope is more resistant to abrasive wear and fatigue? Lang lay Chapter 17: What flexible element can transmit power around corners? Flexible shafts Study
