Thanks to compositepro & Berkshire for your comments regarding my 6061 forming practices. I might have known some of this 50 years ago when I studied Heat Transfer, but I'm afraid it's since left me.
I work with smaller sizes of aluminum, 99% are 6061-T6. In a design I created, I have to bend tabs on some 1/8" x 2" flat bar. The failure rate was over 50%........so I guess you could say I was exceeding the elastic limit, as was mentioned by someone else. Not knowing any better, I decided...
