MD1 Flashcards
(29 cards)
Branch of engineering that deals with energy conversion and design of machines
Mechanical Engineering
process of devising a component, a process or a system to satisfy a desired need
Design
a process in which scientific principles and the tools in engineering - mathematics, graphics, computer, English, etc
Engineering design
are used to produce a plan, which when carried out, will satisfy a human need
Engineering design
combination of several mechanical components that are properly arranged or assembled to cause the forces of nature to produce a desired work with constrained motion
Machine
modifies mechanical work
Machine
skeleton for any machine.
Mechanism
Some Considerations in Engineering Design
Strength, Rigidity, Cost, Safety, Reliability, Weight, Volume, space, Aesthetics, Manufacturability, Legal requirements
prime considerations in Mechanics of Materials since they are treated with the use of stress and deformation formulas
Strength and Rigidity
Two General Types of Stresses
Normal Stress and Shear Stress
a stress type in which the direction of the applied load is perpendicular to the resisting area of the member
Normal Stress
Includes the following stresses: tensile stress, compressive stress, bearing stress, and bending stress
Normal Stress
a stress type in which the direction of the applied load is parallel or tangent to the resisting area of the member
Shear Stress
includes the following stresses: direct shear, induced or indirect shear, punching shear, and torsional shear stress
Shear Stress
constant at any section along the length of the member under the axial load F (uniform stress distribution)
Stress Magnitude
also called contact stress or a crushing stress. Riveted joint
Bearing Stress
most complicated of all the normal stresses
Bending Stress or Flexural Stress
Its magnitude differs at any section in the beam. Most calculations are focused on the section of the beam having the greatest magnitude of stress, or the section having the greatest deflection
Bending Stress or Flexural Stress
Bending is no longer a uniformly distributed stress. In bending, tension & compression occur simultaneously. The maximum stress happens at a fiber farthest from the neutral axis.
Beam Deflection
Shear stress where the stress distribution is uniform or constant, and is located in one section only,
Single Shear
Shear stress where two identical sections or areas resist the load
Double Shear
produces a shear stress and a shear deformation, but no change in dimension, only a change of position
Torque
Where does the maximum torsional stress in the shaft is located?
At the outermost layer
What does cross sections other than round require for their stress and deflection formulas?
Correction Factors
