Engineering Overview © 2012 Project Lead The Way, Inc.Introduction to Engineering Design.
Physical Property Analysis © 2012 Project Lead The Way, Inc.Introduction to Engineering Design.
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Transcript of Physical Property Analysis © 2012 Project Lead The Way, Inc.Introduction to Engineering Design.
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Physical Property Analysis
© 2012 Project Lead The Way, Inc.Introduction to Engineering Design
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Physical Properties
A physical property is a property that can be observed or measured without changing the identity of the matter.
Examples of Physical Properties:
Volume Density Color
Surface Area Centroid Moment of Inertia
Mass Odor Temperature
Weight Viscosity Electric Charge
Boiling Point Melting PointAttraction to magnets
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Physical Property Analysis
The size, volume, surface area, and other properties associated with a solid model are often part of the design constraints or solution criteria.The following are physical properties presented in typical solid modeling programs:
Volume Density Mass
Surface Area Center of Gravity Moment of Inertia
Product of Inertia Radii of Gyration Principal Axes
Principal Moments Length
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Physical Properties
• We have already investigated density, volume, and mass/ weight
• Another important physical property is Surface Area
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Surface Area• Surface area is the area of the
exterior surface of an object.• Surface area is important when
determining coatings and heat transfer of a part.
B
C
D
E
FA
Area A = 3 in. x 4 in. = 12 in.2
Area B = 4 in. x 8 in. = 32 in.2
Area C = 3 in. x 8 in. = 24 in.2
Area D = 4 in. x 8 in. = 32 in.2
Area E = 3 in. x 8 in. = 24 in.2
Area F = 3 in. x 4 in. = 12 in.2
Surface Area = 136 in.2
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Surface Area• Another way to represent the
formula for surface area of a rectangular prism is given on the formula sheet
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Surface Area
Surface Area = 2 [(8 in.)(4 in.) + (8 in.)(3 in.) + (4 in.)(3 in.)]
= 136 in.2
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Formula Sheet
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Additional Physical Properties
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Center of Gravity
• A 3D point where the total weight of the body may be considered to be concentrated.
• The average location of an object.• If an object rotates when thrown it rotates
about its center of gravity.• An object can be balance on a sharp point
placed directly beneath its center of gravity
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Centroid
• A 3D point defining the geometric center of a solid.
• Do not confuse centroid with the center of gravity.– The two only exist at the same 3D point when
the part has uniform geometry and density.
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Principal Axes
• The lines of intersection created from three mutually perpendicular planes, with the three planes’ point of intersection at the centroid of the part.
The X, Y, and Z axes show the principal axes of the ellipsoid.
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Physical Properties and 3D Solid Modeling
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Physical Properties and 3D Solid Modeling
• 3D solid modeling software can display physical properties of modeled objects.
• In Browser right click on part name
• Choose iProperties
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Physical Properties• 3D solid modeling software can display
physical properties of modeled objects
• In Browser right click on part name
• Choose iProperties• Choose Physical tab• Choose appropriate
material• Depress Update button• Physical properties are
displayed
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Brodinski, K. G. (1989). Engineering materials properties and selection. Prentice Hall, Inc.: Englewood Cliffs, NJ.
Budinski, K. G. (1992). Engineering materials (4th Ed.). Prentice Hall, Inc.: Englewood Cliffs, NJ.
Gere, J. M., & Timoshenko, S. P. (1997). Mechanics of materials. PWS Publishing Company: Boston.
Lockhart, S. D., & Johnson, C. M. (1999). Engineering design communication: Conveying design through graphics (Preliminary Ed.). Addison Wesley Longman, Inc.: Reading, MA.
Madsen, D. A., Shumaker, T. M., Turpin, J. L., & Stark, C. (1994). Engineering design and drawing (2nd Ed.). Delmar Publishers Inc.: Albany.
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