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  • Users: prost
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  1. prost

    WARP3D

    Anybody out there use WARP3D before? I'd be interested in what you think of it--how much effort to get up and running? If you have experience with other FE software that has nonlinear fracture mechanics capabilities, how does it compare to those other software?
  2. prost

    Stress Course for Liaison Engineers

    The location of the two documents--the original training course and the answer key, has apparently moved. You can get the following two documents: Stress_Course_for_Liasion_Engineers.pdf Aircraft_Structures_for_Engineers___Solutions.pdf now at following website...
  3. prost

    Analysis of Time Varying Data

    Suppose I have two measurements that vary in time, for instance, Temperature and Dew Point. I want to see if there is some kind of connection between them. I could just plot one vs. the other; result is a big amorphous blob. So I start computing some statistics. If I use CORREL in Excel (it's...
  4. prost

    Titanic article

    I apologize if this is posted in the wrong forum. I considered the ocean engineering one, but this one has more readers I think and this is a materials issue too. http://www.usnews.com/articles/news/national/2008/09/25/the-secret-of-how-the-titanic-sunk.html I wonder if they have considered...
  5. prost

    Use of True Stress/True Strain

    I recently read the thread Nonlinear FEA with Von Misses Plasticity in 17-4 PH900 Stainless Steel and have a question about the original poster's use of the 'true stress' vs. 'true strain'. Why are true stress and true strain used instead of engineering stress and engineering strain? If the FE...
  6. prost

    Exclamation Point attached to variable name

    I saw something in someone else's code--an exclamation point at the end of a variable name. I was unfamiliar with the usage, looked it up, read that the exclamation point is used to specify a variable as precision Single. Usage: "dummy!" will make the variable "dummy" a Single precision...
  7. prost

    Bearing Contact

    This month's Machine Design had an article about modeling bearing contact in a crankshaft. The author first made the point that a "...widely used technique to simulate crankshaft bearing load is with a simple linear arc of loads, say 60 degrees around a reaction-force vector." This seems like a...
  8. prost

    Partial Bridge Collapse in St. Louis

    Looks like weak bridges and (IMO) inadequate inspection procedures are as common in the US as they are in Canada. http://www.stltoday.com/stltoday/news/stories.nsf/stlouiscitycounty/story/5FDA36F6B06430F88625729200247233?OpenDocument There was a good picture in the newspaper, but not on the...
  9. prost

    Cast versus Wrought aluminum alloy

    I have a question about the phrase "cast 7075-T6 aluminum." Every reference I have refers to cast aluminums with designations "AXX.Y", while the wrought aluminum alloys use the 2XXX, 3XXX, etc. designations, with the 'dash' "T-some number" indicating a heat treatment. Does "cast 7075-T6...
  10. prost

    Hand Stress Analysis

    Not to disparage anybody's quality of training in aircraft structural analysis, nevertheless I have noticed a recent trend I thought this group could help explain. Just perusing the many ads for "stress analysts" or some similar description, I have noticed that lately in addition to asking for...
  11. prost

    Electronic db for Personal Library

    I have thousands of papers in my personal professional library. I have a set of index cards that list titles, authors, source (journal), and have the papers in a filing cabinet. I quite often have trouble finding a particular paper in the library if I can't remember any of the authors' names...
  12. prost

    PE Required for "No PE sign off required" Projects

    I have been seeing more and more career advertisements by companies specifying "PE required" or "PE desirable" for what appear to be projects that, as far as I know, have not required a professional engineer (PE) signatures in the past. Say I am a mechanical engineer--generally a PE signature is...
  13. prost

    ANSYS Availability Issues

    I am not currently ANSYS user; someone was trying to show me a model analyzed with ANSYS, and couldn't because he was having trouble starting ANSYS on his computer. Is this a common problem with ANSYS? I would define "common problem" as one occurring once per week or more often.

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