Impact damage
Impact damage
(OP)
Does anyone know how to calculate the depth and diameter of an indentation caused by a steel ball blown at a steel plate in a jet of air.
Thanks in anticipation.
athomas236
Thanks in anticipation.
athomas236





RE: Impact damage
RE: Impact damage
Another approach might be to treat the impact as a Leeb hardness test, determine your energy loss and some how relate that to the deformation caused. Sounds pretty complicated though.
RE: Impact damage
TTFN
RE: Impact damage
RE: Impact damage
What would be far better would be to take your surface and your ball, impact them at a series of known or measured speeds, measure the crater and find the empirical relationship.
This will have the advantage of being accurate.
Gravity drops are favorite as the maths is easy. Another way would be a pendulum (like used in an impact test), basically anything which allows the kinetic energy at impact to be calculated.
RE: Impact damage
The initial kinetic energy due to impact speed will be converted into strain energy less the loss. It is not so easy to express the strain energy in terms of the indentation because of material's nonlinearity by hand. But with the software, it can be done without problem.
RE: Impact damage
Also, I do wonder how consistent the indent sizes of real balls fired at a real surface would be. Would they always be the same? Or would microstructural differences in material mean that there would be a band of sizes?
It all depends on how accurate you want the answer and how consistent your ball sizes, air flow etc. really are.
RE: Impact damage
athomas236
RE: Impact damage