Hi dbstruct,
This is just my opinion on this matter. I’m sure (like me) you have signed an agreement that you will not share company confidential information with the public or with the competitor. Thus the dilemma is; how do you show off your good work with out sharing confidential information? In my company and the past company, we have big enough projects that we do design studies. Usually I would have two or three ways of doing something. When the best way of doing it gets picked, the other two ways end up in a folder. Now, the best way of doing it gets to be company confidential and copy write and all that good stuff, but the other two ways that did not make the cut would end up in my portfolio that I can show to future employers with some adjustments. The adjustments would be to make the designs as vague as possible so that the person reading it can not tie it back to a certain project. No names, nothing that hints it is for the latest project that your company is working on or has in the past. You really just want to focus on your ability and skill not what the design was for.
When I walk into an interview the first thing that I tell the interviewer is that I signed an agreement with my current employer not to share company confidential information so I can not show you any drawings on what I am working on, but I have other evidence here in my portfolio that shows my ability and skill. The interviewer will be impress that you take confidential information very seriously and you will not have to worry that you show off to much information.
I also have gone as far as looking for pictures on the interviewer’s web site and try to spot a design that I could do a mock analysis and design. Something that I can use to show off my skills and ability, but with their product. For example, if company A makes a widget. I would do a mock heat transfer and vibration analysis on how I would have approached the design as part of my portfolio.
In legal terms, I don’t know if this is right, but it worked for me at interviews.
Go Mechanical Engineering
Tobalcane