• Like
12
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

Published

 

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
504
On SlideShare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
8
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. Wood Strength
  • 2. Wood Strength
    • 1.) Wood is Anisotropic, it's properties vary with direction
    • a.) Compressive Strength // to grain is highest.
    • b.) Tensile Strength // to grain is slightly lower.
    • c.) Compressive Strength perpendicular to grain is lowest.
  • 3. Wood Strength
    • 2.) Temperature increases decrease wood strength and toughness.
    • 3.) MC increase also hurt wood strength and toughness
  • 4. Wood Strength
    • 4.) S trength varies a lot with Species & Grade
    • a.) Lower grades of lumber have more imperfections (knots, shakes, etc.) which hurt the strength.
    • b.) Wood strength values for visually grade lumber are drastically reduced to allow for imperfections.
    • Illustration: The Compressive Strength of Eastern White Pine used for design ( Table 4D) varies from 450 psi to 1050 psi. Our lab results were 5000 psi.
  • 5. Wood Strength
  • 6. Wood Strength
    • 5.) Strength-to Weight is good
    • E.W.P. = 1050 psi = 2100 psi
    • 0.5
    • Steel = 24000 psi = 3000 psi
    • 7.9
  • 7. Balsa Wood
    • Hypothesis:
    • The balsa wood at Hobby Shop A is better than the balsa wood at Hobby Shop B
  • 8. Balsa Wood
    • What properties will the MET 211 students working on their balsa truss project be concerned with in deciding which shop to purchase from?
  • 9. Balsa Wood
    • Tests Required:
    • 1.)
    • 2.)
    • 3.)
    • 4.)
  • 10. Balsa Wood
    • Samples Required:
    • 1.)
    • 2.)
    • 3.)
    • 4.)
  • 11. Balsa Wood
    • Test Procedures Required:
    • 1.)
    • 2.)
    • 3.)
    • 4.)
  • 12. Balsa Wood
    • Equipment Required:
    • 1.)
    • 2.)
    • 3.)
    • 4.)