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Tanker Truck Bumper Design

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Hello colleagues,

Do you know how to design the bumpers for cargo tank motor
vehicles (gas trucks) in the US?

According to DOT 178 & 180 regs the bumper has to take a
force of 2x the rated vehicle payload with a maximum
deflection of 6".  Safety factor of 2.0 on ultimate.  Impact
load is to be uniformly distributed along the length of the
bumper.

As a structural engineer, I've been asked to certify the
capacity?  Who would normally certify the design of these
bumpers?

Do you know what the liability issues are?  Can liability be
effectively limited?

What about reuse of the design for multiple vehicles?  What
is that worth?

Thanks for your input.

Brad Friederichs
VE Solutions, Inc.
Rancho Cordova, CA, USA