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(not an engineer)
For a gradual impact zone, I'm guessing the most holes/cutout would be at the very front for light taps.
Then a small section of blank.
Then a section of less holes for harder hits.
The big energy starts transferring there.
But the real problem with that design is the first part is already broken and doesn't transfer anymore.
Ok. Ignore all the above.
There should probably be a few safety wires in case the whole bumper randomly falls off and starts rolling under the car due to unseen damage.
Another approach would be pipe cylinders inside cylinders.
A section breaks and slides inside the next.
Then another section breaks.
But the problem with that design is all that overlap starts to add up in weight.
Back to zero.
To make it feasible, a few designs should be run through a CAD program and crunch the #s.
The weight losses may be negligible and the potential damage to the rest of the car immeasurable.
It might work well for bumper parking, but the insurance company might not cover any greater loss.
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Meanwhile other things are still happening.
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