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  1. yirmidokuz

    What questions to expect during the interview for a graduate level FEA analyst position?

    @RCCT, Might be out of topic, but can you share what was your road to learn FEA by yourself from beginning to the level you are now. I hold masters of material engineer degree, and I am genuinely interested in FEA, specifically non-linear. So, i think I expect to hear useful strategy from you...
  2. yirmidokuz

    NINCAD 2019 Mesh Problem

    @richardl63 thanks for the answer. But the geometry was created by inventor. An I still get this in some other works which I create the geometry by inventor too.
  3. yirmidokuz

    How to convert acceleration value to decibel dB?

    @271828 a0 = 10µm/s2 is ref. value, than 0dB -> 10µm/s2. In this case, how you calculate the dB ?
  4. yirmidokuz

    How to convert acceleration value to decibel dB?

    Thanks! But it is kind of complex equation to interpret. dB (La) = 20 lg (a/ao) dB re 1 µm/s2. For example what is "re" in the equation above? I get the decibel values at the LHS of equation when I plug the values for a 6 m/s^2 and a0 = 10µm/s2, as 115 dB?
  5. yirmidokuz

    How to convert acceleration value to decibel dB?

    Dear all, I measure the acceleration of the collision of the inner parts as an outcome of the noise vibration, with the sensitive acceleration sensors. How can I convert the acceleration value of 90 m/s^2 to decibel value? Thanks in advance.
  6. yirmidokuz

    EPDM+PP Blend vs EPDM

    Thanks, I do not know the grades for both. Where can I find a source to look for? Actually, it would be good if I can find data to compare EPDM+PP and EPDM ..
  7. yirmidokuz

    EPDM+PP Blend vs EPDM

    Dear friends, I am looking for the service temperatures of the both. I would like to use one of them as a material for heat shield. Can anyone refer me source or where can I look for this information? Thanks.
  8. yirmidokuz

    NINCAD 2019 Mesh Problem

    Dear All, I have been trying to simulate a static-structural problem. Assembly includes some sub-parts and contacts. When I try to get the mesh, I have the strange meshing result in attachments (mesh goes out of the part and reaches to coordinate system center) which yields to failure. What...
  9. yirmidokuz

    Recrystallization Problem in Aluminum Extrusion

    @WKTaylor The photo given in the first post was from another extruded rod. I shared that photo because the variation of the grain structure too obvious. we are extruding in T4 temper. I couldn't clarify much what that means actually.
  10. yirmidokuz

    Recrystallization Problem in Aluminum Extrusion

    @metengr Yes. They are definitely homogenized.
  11. yirmidokuz

    Recrystallization Problem in Aluminum Extrusion

    This one was right after extrusion. But in some other diameter rods, it happens after heat treatment. I see this problem even in the low extrusion ratios,eg 13. I am suspicious about the ram speed. I am going to give it a try.
  12. yirmidokuz

    Recrystallization Problem in Aluminum Extrusion

    Hi all colleagues, I am working in an aluminum extrusion company. We are mainly manufacturing 6xxx series aluminum profiles, using extrusion processes. Recently, we received a claim from one of our customers regarding the issue given in the photograph below. As marked in the photo, there...
  13. yirmidokuz

    What are the sources for structural analysis of a solar panel ?

    Is there anyone advice or show guidance for ground mounting solar systems ?
  14. yirmidokuz

    What are the sources for structural analysis of a solar panel ?

    Hi all, The company I am working for, initiates a new project that to produce aluminum frames and construction parts for solar panels. To design its own model we need a structural analysis. In addition as i looked through roughly, we should consider wind&snow loads to compel our solar panel...
  15. yirmidokuz

    Standard cubic meter natural gas consumption calculation

    @dgallup I see, thank you for the explanation.
  16. yirmidokuz

    Standard cubic meter natural gas consumption calculation

    @EdStainless Nope, I hadn't checked it. I will. Thanks.
  17. yirmidokuz

    Standard cubic meter natural gas consumption calculation

    @EdStainless That could be right. But how can i check that if the meter reads m3 or sm3. It writes m3 in the unit of the indicator. @dgallup How did you come up with 1.2/1 ? I couldn't get it exactly.
  18. yirmidokuz

    Standard cubic meter natural gas consumption calculation

    Hi all, I am trying to calculate of our natural gas consumption per tonnes of aluminum that they be casted in our furnaces. I checked the natural gas meter for one month and divide the result by the amount of aluminum that casted. The result is 115m3/ton. But to make sense out of this data ıt...
  19. yirmidokuz

    Odd apearence in the microscope.

    Could it be the room lightning from the ceiling ? I had a similar issue before, and when I block the light that hits on oculars the effect was cleared. It also looks like wave interference pattern.
  20. yirmidokuz

    How to characterize high purity material ?

    I am in doubt of usefullnes of OES method, since I need to look for the elements where they may exist in the material at ppm levels. @Maui They have sent us a ICP OES analysis of the material. But we have to justify the results in more certain way. I don't trust ICP OES method at this level of...

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