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Thank you guys for all the comments. I appreciate the thoughtful responses. I do think I am going to ask for a hold-harmless agreement at a minimum. I may ask to be named on the company liability insurance policy but may have a harder time getting this one done. Next week, we have performance...

Common sense tells me that, yes, the same level of should be taken by both the licensed and non-licensed engineer if given the same project. Neither of us want the beam to collapse or the bolt to fail, so we are both going to use our engineering training and skills to design something that is...

I am employed by a company that designs and manufactures very specialized automated equipment used in the nuclear radiation research arena. I have worked with the company for several years and just this past year, obtained my P.E. license. All of the design engineers with the company (including...

This afternoon I just did a real quick 1/25 scale (by weight) test. No calcs. just rigged up a quick release mechanism, found something cylindrical and heavy and dropped it into a 55 gallon drum of water from 13ft. Lost 75% of my water and punctured the bottom of the 20ga. steel drum. Good first...

Thanks btrueblood... I should have clarified in my OP. The primary concern for this test is the failure of the 1/2" thick basin wall. Failure in this case would be defined as a fracture, crack, split, etc. that results in 1.5m or more of the water depth leaking out of the basin and into the...

I need advice on how to properly scale the physical parameters surrounding a scale model drop test I want to perform. Obviously, the way to do this is thru dimensional analysis. My question though, is where to begin…. I this post here, I describe a drop test of a 10000lb cask into a basin of...

Thanks for the thoughts so far guys. We have decided to go with MSC MD Nastran. The package has Arbitrary Lagrangian Eulerian (ALE) analysis capability and so should be able to handle the fluid structure interaction. It should also handle the splash effects pretty accurately as well. By the...

I am trying to solve a fluid structure interaction problem and am looking at the possibility using MSC Nastran/Dytran to handle the combined Lagrangian/Eulerian meshing and simulation. I am trying to determine what would happen to the walls of tank of water whose top is open to the air (like a...

I have a 7ft diameter x 15ft deep cylindrical basin of water that has the side and bottom formed from 1/2" welded steel plate. This open topped basin is buried in the ground with the open end "flush" with the ground. I have been tasked with doing an analysis to determine what the effects on...

I am designing a spreader bar to lift 15,000lbs with a safety factor of 3 when considering yield stress. This spreader bar will be made from a laser cut piece of 1" thick A36 steel plate. The customer's crane has a typical 8~10 ton Crosby swivel hook, and I have located an elongated oval hole in...