Restraints

[digger200]

I would like to place some tiedown points on a trailer bed to secure small loads (80Kg) within a compartment. What sort of G forces could I expect in say a 30mph crash.
Is 5G a reasonable figure at this speed?
Thanks

 

[GregLocock]

Instantaneous 80g in the cabin

Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[digger200]

Greg, Would cargo restraints be designed to this figure? What loads are seatbelt restraints designed for?
Thanks
Mick

 

[GregLocock]

Well, that's the problem. The peak acceleration of the structure is 80g, seatbelts are designed NOT to transmit that to the passenger, otherwise we might as well use cheesewire, and provide a handy box to take the body parts home in. That's why they stretch.

Given the mass of your parts I suggest that using passenger restraints is appropriate, try searching for R14 for anchorage tests and FMV 208 for passenger crash tests.

Since your trailer is exposed to sunlight watch UV degradation of the webbing.



Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[IRstuff]

You can look at MIL-STD-810 for transport crash specifications.

TTFN

FAQ731-376

 

[CoryPad]

Just a small clarification: Greg is referring to FMVSS 208 Occupant Crash Protection. More information is available here:

http://www.nhtsa.dot.gov/cars/rules/import/fmvss/index.html#SN208

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[IRstuff]

The passenger compartments of most vehicles have stricter derived requirements. Truck beds do not. MIL-STD-810 Method 513, Procedure III "Crash Safety" lists cargo at 20 g's. Method 516, Procedure V "Crash Hazard" lists ground equipment at a peak of about 75 g's.

TTFN

FAQ731-376

 

[digger200]

Thanks for the replys