Twine Testing
The first couple of days thus far I have found myself testing the structural properties of different types of twine. The two under analysis thus far are Sisal and Jute:
Sisal: Jute:
To test the tensile strength of these twines, a bucket was suspended from a beam by a length of twine. The diameter of the twine was taken at three locations (top, middle, and bottom) using digital calipers. The bucket was then filled with sand until the breaking point of the twine was reached. The combined weight of the bucket and sand is the strength at failure. By dividing the strength at failure by the approximately circular area of the twine, the material stiffness was determined.
Below is a link to a YouTube demonstration of this stiffness test. My research partner, Jonathan is adding sand to a bucket until brittle failure of the test specimen is observed:
http://www.youtube.com/watch?v=cj8cGFziQog
