Methods:
Joint Testing
Joint: "a location where a component is sewn or connected to another component"
Joint Factor: "a 'loss in joint strength…relative to the basic material strength' that occurs when 'textiles are connected to each other or to metals.'”
Warp fibers: "fibers of a textile that carry the majority of the load and are in the direction of the load axis"
Fill fibers: "the fibers whose primary purpose is to organize the structure and facilitate load sharing"
Image from https://ntrs.nasa.gov/api/citations/20150003409/downloads/20150003409.pdf
3 Parachute materials:
- Cord: Typically braided
- Tape/Webbing:typically woven, warp and fill fibers
- Cloth: typically woven, warp and fill fibers
This method of testing analyzes the strength of these joints to obtain the joint factor, which is The ideal situation would have the stitches break before the material itself, showing that the material's strength is being used at its fullest.
For an in depth look of joint testing check out: https://ntrs.nasa.gov/api/citations/20150003409/downloads/20150003409.pdf
Tensile Testing
We have already previously used Instron machines for tensile testing, stretching materials to test their strength and elasticity.
More information on previous Instron testing can be found here: Instron Testing
Software
Possible programs to run simulations include:
- Parachutes, https://www.cimne.com/parachutes