09-29-2022, 06:28 AM
Klem Wrote:Ninny,
Your theory makes sense, but it is not definitive.
Another is, on early unlocking there was still enough pressure in a weakened, superheated case to rupture along the path of least support at the time. This assumes the post-peak/dwell-time pressure was enough to rupture an unsupported case. Expansion from too much headspace may also have been involved to weaken the case, but that is another assumption.
I am keeping headspace on the table, but since I don't need the science from it to explain my failure model(s) and since I don't think it is dimensionally significant as compared to the feed cone depth issue, I have it very low on my list as a significant contributor to this.
Again, we have mostly commonality and agreement here in theory! Just not significance.
The only part I disagree with 100% is that you will never rupture a case in any scenario in battery where the pressure was lower than an earlier pressure. This is what I was getting at with LRRPF52 earlier. Again, prior to the rupture, pressure was rising and rising, never falling. Then right at the rupture it is at peak value. Right after the rupture, the pressure will immediately start dropping. So there will never be "post-peak/dwell-time" phase pressure to rupture a case in-battery. If it didn't happen at peak pressure, it's not going to happen at any lower pressure after that.