Types of Engineers ChemicalBiochemical Civil Mechanical Electrical Computer Materials Biotech Aerospace Starting a Career in Engineering Every year nearly 100000 new college students enroll in engineering programs ID: 626124
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Slide1
Engineering Design CycleSlide2Slide3
Types of Engineers
Chemical/Biochemical
Civil
Mechanical
Electrical
Computer
MaterialsBiotechAerospaceSlide4
Starting a Career in Engineering
Every year nearly 100,000 new college students enroll in engineering programs
What kind of activities do you enjoy doing?
Do these activities match with any areas of engineering?Slide5
Strong Shapes
Triangles—can’t change the shape without changing the length of one of the sides. Especially good with compression.
Arches—handle compression by sending it out to the edges
Columns—difficult to compress, need to be completely verticalSlide6Slide7
A curved structure designed to carry loads across a gap mainly by compression.
ArchSlide8
Arch bridges
Always under compression.
The force of compression is pushed outward along the curve of the arch to the piers.
This greatly reduces the effects of tension on the underside of the arch. Slide9
Kintai Bridge
Iwakuni, JapanSlide10
Popsicle Stick Bridge BuildingSlide11
Most Common Bridge Types
Suspension Bridge
Truss Bridge
Arch Bridge
Beam Bridge
HybridsSlide12
Suspension BridgeSlide13
Truss Bridge – (Snohomish)Slide14
Arch BridgeSlide15
Beam BridgeSlide16
Hybrid – Sydney HarborSlide17
Popsicle Stick Bridges
SimpleSlide18
More ElaborateSlide19
How to Start
Know the Rules
Constraints & Specifications
Max mass of entire bridge: 275g (each stick weighs roughly 1.4g)
Length: 25” min 30” max
Width of bridge: max 5”
Road bed must be between 3” above and 7” above the supports
Bridge will be loaded from above, in the middle, on the road bed by a 3”x3” press—can’t be obstructed
Bridge parts can be no more than 9” above the supports, no lower than 1.5” below the supports
A 4”x 4” “vehicle” would need to be able to pass through your bridge on the roadbed
No sticks can be completely hidden from view
Only white Elmer’s Glue is allowedSlide20
“Only as strong as your weakest link”Slide21
How many sticks can we use?
Max weight of bridge = 275 grams
Each stick weighs 1.4 grams
275 / 1.4 =
196 sticks total
Save sticks for the road!
Each stick is 3/8” wide (.375”)
25” / .375” =
67 Sticks For Road Slide22
Building the Sides - Tips
Lay out full size on paper. Does it all fit?Slide23
Building the Sides - Tips
Use a Jig
Upper and Lower ChordsSlide24
Building the Sides- Tips
Consider roughing up the surface to be glued. Test to see if it helps??
Apply glue to Both sidesSlide25
Building Tips
Test different amounts of overlap
Once you find a good overlap, make a jig.Slide26
Building Tips
Easy Built Arch
Draw 8” max height
Draw 24” min Span
Clip 8 sticks together and bendSlide27
Building Tips
Easy Built Arch
Glue together and duplicate the other half
Join halves on paper and you’re done.