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.'”
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.
" In most cases, the joints being tested are sewn. Occasionally, components are joined with a looped connection or tied. Joints between textiles and the spacecraft structure (typically metal pins) are also tested using accurate interface geometry." Tests are meant to analyze one joint at a time.
Since we do not have one of these machines, a modified version using our INstron machine would be advised to perform these tests.
Fore more specific testing procedures and designs go to pages 9-12: 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
-Vorticity, https://www.vorticity-systems.com/disciplines/parachutes-and-aerodynamic-decelerators/
Sources:
https://ntrs.nasa.gov/api/citations/20150003409/downloads/20150003409.pdf
https://www.cimne.com/parachutes
https://www.vorticity-systems.com/disciplines/parachutes-and-aerodynamic-decelerators/