Posted by MarkB_MI on July 18, 2016 at 07:24:59 from (198.208.251.21):
In Reply to: Re: DOT?? posted by Geo-TH,In on July 18, 2016 at 06:02:13:
> Back to my original idea. Do you think the DOT chain requirements will really save your life when you stop faster than 0.8 g's?
> People who have been in an accident say the seat belt leaves burses. So what's your best guess how many negative g's do they experience? Then apply the -g's to DOT chain requirement and D ring strength. Strong enough???
Well George, no doubt the DOT requirements are intended to strike a balance between what is desired and what is practical. You're not going to tie down your machine using anchor chain off the Queen Mary, so at some point your chains will fail.
As I said in an earlier post, it seems that seat belts are designed to handle a 40 G crash. Most likely the assumption being that a 40 G crash is not survivable, even if your seat belts hold. But I'll bet most crashes are 10 Gs or less; enough to bruise you but not enough to sustain serious injury. And I'll bet very few truck crashes exceed 10 Gs. But that means there still must be a lot of truck crashes where the G forces on the load exceed the breaking strength of the restraints.
I suspect that the DOT wants to ensure that the tie-downs are not the weakest link. There are a lot of things that can fail in a 10 G crash: truck frame, trailer frame, trailer king pin, etc. If something else fails first, the full force of the impact will not be transmitted to the load tie-downs.
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