This is Not about tooting my horn - we all have great experiences… I hesitate posting this and wasn’t going to but, between Covid down-time and comments about screw/hole sizes, well, lucky you… Criticize me for posting it if you like, I’ll ignore it.
Yes, there are Industry and Military standards. Standards for nearly every material, loading, geometry, environmental conditions, etc and, many Phd’s spending countless hours working on this stuff and dissertation’s.
I have many books and standards to look at but, always reflect on this story…
I remember sitting in a Joint Military meeting 30 yrs ago (regarding a Nuclear Warhead) in a room with 4-feet thick concrete walls, reviewing a failure. Fifteen seasoned Phd’s sitting across from me and uniforms with stars & stripes sitting on my side of the table.
As the review progressed, my anxiety increased as I struggled with ‘How to tell all these really smart folks what was wrong’. For sure, all of them (plus many others) did reviews prior to the meeting. I couldn’t take it anymore so, I said, “I have a question about something back on page 1.”
I said what I had to say (it took 10 seconds), and the meeting was immediately called to an end and I was told to stay. Fifteen minutes later I was driving a rented car, following a Jeep with MP’s, sirens blasting and red-lights blinking to an air field to get on a Delta Airlines plane that had been re-routed just to pick me up. Why? Because I thought it best to not say ‘No’ when rewarded for saving 120 Million Dollar program.
When I say 1.5x, I say it with 50yrs of Engineering experience, knowing that every specific application/usage will require commonsense, good judgement and knowledge that One-Size does Not fit all…
Lastly, and don’t mean to offend… Perhaps, if anything, to encourage others, the most important words whispered into my young ear, when deciding what field of Engineering/Physics to pursue, was this; “Get a degree in Mechanical Engineering because you’ll learn enough about all other Engineering disciplines to enable becoming an expert.