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  • Users: bjpil
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  1. bjpil

    Convergence criterea for flow analysis

    Anyone have a good opinion on a convergence criteria for a flow analysis using FE. Thanks, BJP
  2. bjpil

    Failure investigation question

    Hello All, I was talking to a metallurgist last night and he was trying to convince me that there is a process to determine the stress of a part after it has failed such as an airplane crash. He said that an acid and dyes are put on the specimen and then the specimen is examined through a...
  3. bjpil

    Verify plastic material through testing

    Hello, I need some advice on how to verify and spec out, through testing, a plastic part that will reside in an oil pan. What are some of the typical testing for something like this? I am currently just looking at testing a material and not the part. If it survives the initial testing then I...
  4. bjpil

    External aluminum thread

    Hello, I’ve been asked to replace a hydraulic filter fitting (external tap) with an aluminum cast in feature, part of the main housing, to reduce the number of parts. My concerns are the service life of the part and the wear of the aluminum threads due to changing the filter, cross-threading...
  5. bjpil

    Replace LMS' CADA-X Software

    Hello All, I am hoping to replace our current Modal test and analysis software (LMS’ CADA-X) with another software. I would like to use our current data acquisition hardware with the new software. We are currently using a VXI main frame (E1421B) with two 16-channel input modules (E1432A). We...
  6. bjpil

    101 of casting simulations

    Hello all, I am hoping this is the best place to ask for help. I’ve been using FEA for a while and now I’ve been asked to critique a casting simulation using a specific flow analysis software. How much different is structural FEA from flow analysis, besides the obvious, and how does one judge...
  7. bjpil

    Family tables/part and drawing update

    Hello, We created a drawing from a part that references a family table (cast/machined). We then created the drawing from the cast instance. Someone then broke away the cast instance to a single part and modified it. The old drawing references the old cast part but I want to update the old...
  8. bjpil

    How to connecting solid interface meshes together?

    Hello all, I am having troubles connecting two solid element meshes together in MSC/Nastran. For simplicity sake, I have two cubes, one on top of the other with a small gap between them, meshed using hex elements. At the gap interface, I connected rbe2, constraining all translations. The bottom...
  9. bjpil

    A380 - Ductile or Brittle

    Hello, I have a question as to what dominant characteristic does A380 cast aluminum has, is it a brittle or ductile material? The reason I ask is to determine which failure theory to use, distortion energy theory or maximum normal stress theory. Is there a rule of thumb that would help to define...
  10. bjpil

    Accel/Force transducer combination to measure driving point

    Hello, I am trying to set up modal test using a shaker with a rated output force of 7lb pk. I am in the process of finding a force transducer to mate up to the stinger and test part. Does anyone have a recommendation for a force transducer? Most of the equipment that we use are from PCB. Should...

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