That's right, an air conditioner unit fell on this Z4 and left several dents. The owner kept this Z4 as a summer vehicle and this summer the air con fell on its fender and I think rolled over and made some more dents. This video explores the issues with the main deep dent, issues about overstretched metal for PDR, and the complications from the limited access to the damaged area on this fender.
I wasn't that sure about the stability of the shape during repair. And I even called the owner and prepped him for a less than perfect repair. I got off this repair, checked out and slept on the repair; the next morning I reset mentally and it worked out! PDR really puts you at your limits and tests you. How far are you willing to go. It's easy to quit, but if you don't you might surprise yourself and your client.
The deep part didn't oil can, in the next morning, I realized had enough places to put the extra stretched surface in all the waves all over this fender. I also did alot to not stretch it more by using some Stanliner tools/techniques that sweep metal into the dent rather pushing the sheet up. I had heat on at about 170 F on the surface for much of the work in the deep part. In this case I did everything I could to prevent myself to NOT add any more overstretch to the panel.
I talk a little about material behaviour as you stress it. BTW if your looking at the stress-strain graph I put up, strain is an engineering term for how much stretch the metal is experiencing. These graphs are fact and well documented in material science. We had to learn about these in first year engineering.
11 сен 2021
