Your SlideShare is downloading. ×
0
12
12
12
12
12
12
12
12
12
12
12
12
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

12

531

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
531
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
9
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 <ul><li>1.) Wood is Anisotropic, it&apos;s properties vary with direction </li></ul><ul><li>a.) Compressive Strength // to grain is highest. </li></ul><ul><li>b.) Tensile Strength // to grain is slightly lower. </li></ul><ul><li>c.) Compressive Strength perpendicular to grain is lowest. </li></ul>
  • 3. Wood Strength <ul><li>2.) Temperature increases decrease wood strength and toughness. </li></ul><ul><li>3.) MC increase also hurt wood strength and toughness </li></ul>
  • 4. Wood Strength <ul><li>4.) S trength varies a lot with Species &amp; Grade </li></ul><ul><li>a.) Lower grades of lumber have more imperfections (knots, shakes, etc.) which hurt the strength. </li></ul><ul><li>b.) Wood strength values for visually grade lumber are drastically reduced to allow for imperfections. </li></ul><ul><li>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. </li></ul>
  • 5. Wood Strength
  • 6. Wood Strength <ul><li>5.) Strength-to Weight is good </li></ul><ul><li>E.W.P. = 1050 psi = 2100 psi </li></ul><ul><li> 0.5 </li></ul><ul><li>Steel = 24000 psi = 3000 psi </li></ul><ul><li> 7.9 </li></ul>
  • 7. Balsa Wood <ul><li>Hypothesis: </li></ul><ul><li>The balsa wood at Hobby Shop A is better than the balsa wood at Hobby Shop B </li></ul>
  • 8. Balsa Wood <ul><li>What properties will the MET 211 students working on their balsa truss project be concerned with in deciding which shop to purchase from? </li></ul>
  • 9. Balsa Wood <ul><li>Tests Required: </li></ul><ul><li>1.) </li></ul><ul><li>2.) </li></ul><ul><li>3.) </li></ul><ul><li>4.) </li></ul>
  • 10. Balsa Wood <ul><li>Samples Required: </li></ul><ul><li>1.) </li></ul><ul><li>2.) </li></ul><ul><li>3.) </li></ul><ul><li>4.) </li></ul>
  • 11. Balsa Wood <ul><li>Test Procedures Required: </li></ul><ul><li>1.) </li></ul><ul><li>2.) </li></ul><ul><li>3.) </li></ul><ul><li>4.) </li></ul>
  • 12. Balsa Wood <ul><li>Equipment Required: </li></ul><ul><li>1.) </li></ul><ul><li>2.) </li></ul><ul><li>3.) </li></ul><ul><li>4.) </li></ul>

×