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I would say gas pressure cycling is a factor as well as thermal cycling that you would get. Depending on your geometry, you may also have induced vibration due to aerodynamic effects. Are there some old timers that you can discuss the physics of the problem with first?

I agree with both MikeHalloran and dhenger in that you need to be very mindfull of your heat flow path. As for material zinc is also a good choice.

Here is a good place to start: "How to achieve valid results in durability analysis from ANSYS," J Draper,Safe Technology Limited, R Aveline,Manta Corporation. If you go to Safe Technology Limited website, you will find a number of good articles. Ali

Your time period seem to be a bit too large for a shock environment. Theoretically, to do things right, you need to know the time historty of your load and conduct a dynamic analysis - which is not that difficult to do (time consuming may be). You may even assume a triangular or sinusoidal...

I just read your post and was rather amazed that peek did not work. Peek has a very small water retention property. I am curious to know the percent shift in the frequency that you experinced. Are you sure you have not damaged the wire insulation during the over-molding process? One more...

Depending on the details of what you need to do and the FEA software you choose, what you have described is doable. However, if you are not comfortable with running FEA software, you may want to consider a consultant do the job for you. It may turn out to be less expensive than buying the...

Jalil, I believe you would be better off if you were to post your question in the ANSYS section and not here. Ali

Ultem is a good material to use. In my experience, you should not use a wall thickness less than 40 or 50 mils - there are exceptions of course. What you need to watch out is development of residual stresses during the molding process. Depending on the material flowing inside, associated loads...

Now what IRStuff says is real engineering. Now, Bill, you say that you are designing an enclosure. One thing to consider is what you will be placing into this enclosure will have a direct impact on your design approach. For example, if you are designing a rack system for electronic equipment...

You are right tunalover. His formula is based on the input G, the magnification factor and the natural frequency of the board. Ali

Do expect any vibrations? Steinberg has some suggestions on PCB deflections in a vibration environment. I wonder if that data can help you. I have to admit that I like IRstuff's solution. Ali

I am a sucker for innovative ideas. At the same time, I am not an automotive engineer and not familiar with the details but I know that the thermal conductivity is much larger in the plane of the crystal as opposed to orthogonal to it. This concept has been expolited in the carbon nano tube...

Have you looked at ASTM D999?

to calculate the natural frequency properly, you need to specify your boundary conditions accurately. In other words, you need to specify, how your part is being held. I suggest you refer to "Mark's Standard Handbook for Mechanical Engineers" to find the right formula. I just thought of...

This is a broad question. Have you tried searching SAE standards and/or transactions?

Oops! I stand corrected! These are my corrected values: 1) e=.05, Delta T=36.8 deg C, Qrad=4.8, Qconv=65.2 2) e=.95, Delta T=18.6 deg C, Qrad=42.2, Qconv=27.8

If you have aluminum is anodized and you take radiation into account (no solar load), your temperature rise should be about 12 deg C. If on the other hand your aluminum is nor anodized, then, your temp rise can be as high as 23 degrees about atmosphere. I did the calculation based on a simple...

I agree with Fawkes and Tom Walz. I do have experince with CFD and explosion suppression. It does not even look easy on the paper. Ali Jamnia

Alumibeam, I am having a hard time visualizing what attached to what. Could you supply some kind of a picture? Ali

Hello Ivan, We do weld small parts ultrasonically. You have to make sure that you have tight tolerances particularly on the flatness of your weld surfaces. We use DuKane's equipment and their engineers provide us with a wealth of information on our joint design. You may want to consult with...