Tiedown Straps Stiffness
Tiedown Straps Stiffness
(OP)
Folks,
I am seeking data on stiffness values of typical 2" aviation cargo tiedown straps.
Can anybody direct me to such data?
Thank You
I am seeking data on stiffness values of typical 2" aviation cargo tiedown straps.
Can anybody direct me to such data?
Thank You





RE: Tiedown Straps Stiffness
RE: Tiedown Straps Stiffness
You may try to contact strap manufacturers or be forced to perform the testing yourself.
It is an odd situation, but I suspect it has to do with the strong interaction between the raw fiber properties and the complex assembly process that goes into making fabric. Some fabrics have almost no shear resistance; others are very shear resistant.
RE: Tiedown Straps Stiffness
Consider the barrier net that would restrain cargo in an aircraft, and picture thousands of pounds of cargo being held back at 9g's. The nets stretch a lot. Now ask yourself if the next obstacle installed in front of the net, which could be a bulkhead, or a seat, or a cabinet, installed far enough ahead of the net, that the cargo won't come in contact. If it does, how much load is added to the obstacle?
When faced with the issue, I decided to test the net. Actually, I tested a single strap, and used the stretch to calculate the deformation of the net. Plus a margin.
STF
RE: Tiedown Straps Stiffness
RE: Tiedown Straps Stiffness
That said, expect to validate by test.
RE: Tiedown Straps Stiffness
Also found this FAA AC 120-85 that gives some useful information. It references AS 5385 and ARP 5596.