copied from Trailersauce.com at http://trailersauce.com/information/draw-bar-design/trailer-drawbar-design-function/bajallama wrote:...Correct me if I'm wrong, but the tongue only experience bending loads and not torsion because it is jointed at the receiver. It's part of the reason single axle trailers don't articulate well. I need to get final weights (which is tough since I am changing a lot of the design on the fly) but I may run some cyclic loading simulations of the frame to see what kind of FOS I have.
The tongue does a lot of work while towing. Every little bump in the road and every turn you make transfers stress through the tongue and compresses, twists and stretches the tongue material constantly. If the trailer has been built with an undersized tongue or the trailer is constantly overloaded or unbalanced, this repeated loading and unloading (cycling) of stresses on the tongue can create microscopic cracks within the grain structure of the tongue material. Over time a microscopic crack can grow and eventually reach a critical size, where the tongue may suddenly fracture and ultimately fail.
Pmullen503 wrote:How are going to lift the top?
Pmullen503 wrote:So the door is removed for folding? And another panel fills the gap on the other side? Clever.
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