If you've done high voltage design for any length of time, you've probably encountered problems with punch-through on high voltage insulated lead wires. (If not, you have something to look forward to).
Researchers now have an idea about how failures occur in the insulation, and it has to do with applied voltage. No surprise there, but what is surprising is how the damage actually occurs. First comes creasing, then comes cratering.
It's exciting to think that info from this study may lead to improvements in lead wire insulation. Learn more about the research conducted at Duke University.