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  1. smyth13

    Burst Pressure of a Class 125 and a Class 250 cast iron fitting?

    All of your assumptions are correct. Lawyers are involved and the exact circumstances that may have caused the failure are unknown. In addition, it is not known when this fitting was installed, etc. We have not yet determined the cause of failure from a metallurgical perspective, but from a...
  2. smyth13

    Burst Pressure of a Class 125 and a Class 250 cast iron fitting?

    Thanks for the input. I have been considering water hammer, etc. and for me the issue is not what is causing the failure pressure, but what the actual failure pressure is. I understand the working pressures for these fittings as you have described and perhaps this particular fitting did fail...
  3. smyth13

    Burst Pressure of a Class 125 and a Class 250 cast iron fitting?

    MJCronin: Thanks for the reply. The reason I am asking for this specific information is that a cast iron fitting has failed in service for one of our clients. I have performed some "rough" hand calculations and am currently creating an FEA analysis in an effort to determine the "burst"...
  4. smyth13

    Burst Pressure of a Class 125 and a Class 250 cast iron fitting?

    I would like to know a "general" guideline for the burst pressure of a Class 125 and a Class 250 cast iron fitting? I have looked into ASME B16.4 and it does not mention what the burst pressure is, or what the assumed safety factor is. I am just looking into obtaining some information on the...
  5. smyth13

    Friction Heating.....Thermal Seizure Question

    Thank you for the reply. That is my feeling exactly. Although the clearance is relatively small (~0.009"-0.020"), the amount of temperature change needed to "fully" close this clearance gap by thermal expansion alone does not appear to be possible due to the effects of frictional heat...
  6. smyth13

    Friction Heating.....Thermal Seizure Question

    I have a question concerning the potential for frictional heat generation to cause the seizure of a shaft within a bore? My issue involves a punch becoming stuck within a bore during a compression punching operation. I believe the issue is a lubrication issue where the frictional coefficient...
  7. smyth13

    Creating An "Assembly" Between DesignModeler and Classic.

    Thanks. I figured that out on my own. I actually sent out this question before I even tried it myself, under the assumption that it would be more difficult than it actually was. It was surprisingly easy to do!
  8. smyth13

    Creating An "Assembly" Between DesignModeler and Classic.

    I am trying to create an "assembly" between a Design Modeler geometric component and a geometry being created in ANSYS classic. A colleague of mine has created a portion of the overall geometry in ANSYS Classic. Since I am more comfortable creating the component in ANSYS Design Modeler, I...
  9. smyth13

    "Find" Output Notation

    Sorry I was trying to place the result into an array and not one variable. As I said I am new to the syntax of Mathcad and was just curious as to what the result was telling me about the infinite solutions. I understand if I insert numerical values that I will obtain an answer, but I just do...
  10. smyth13

    "Find" Output Notation

    Yes. I understand how to solve the equations by hand. This is a snippet of a larger set of equations that are not trivial. You are not answering my question, my question is what exactly does the Mathcad syntax mean? I understand the linear alegbra, but I am not understanding the "_t1 -...
  11. smyth13

    "Find" Output Notation

    Thanks for the reply. I am not trying to include a program into the Find command, I am only trying to understand what the solution output is implying. I understand that "_t" is a Mathcad variable indicating infinite solutions, etc. but this particular output is causing me some confusion...
  12. smyth13

    "Find" Output Notation

    I have a simple question regarding the mathematical syntax of my "Find" output. I am trying to solve a system of three equations symbolically and I am getting a parametric conditional solution I believe. The mathematical syntax is not exactly clear to me (although I am a newbie to the Mathcad...
  13. smyth13

    Preventing RBM when contact is the only restraint

    Very interesting insight into this topic, even if it may have strayed from my original post. Advanced features that appear across the spectrum of FEA codes, in my opinion, are universally a positive advancement. There is no code specific knowledge and any method learned could be easily applied...
  14. smyth13

    Preventing RBM when contact is the only restraint

    Thank you all for the very informative responses. I appreciate the different approaches taken and will certainly be cognizant that there are multiple approaches to achieve the (presumably) identical result. I am most definetly in favor of new technologies and more advanced methodologies that...
  15. smyth13

    Preventing RBM when contact is the only restraint

    Thanks for the replies. I have used "weak" springs to prevent the RBM (and checked their reactions) and I always try to take advantage of symmetry if possible. In addition I have been altering the frictional coefficient from 0 to infinity to determine how this changes the contact forces (and...
  16. smyth13

    Preventing RBM when contact is the only restraint

    I am looking to prevent rigid body motion in a contact analysis problem where the contact is the only restraint against an applied load. This is a generic question concerning general procedures used by members of this forum, although I also have a specific example I am concerned with. I am...
  17. smyth13

    Biaxiality Indication Plot in ANSYS Classic

    Does anyone have a macro (or method) for plotting the biaxiality indication in ANSYS classic? This is basically a ratio of the principal stresses. I know it can be done as Workbench has this in its Fatigue Module, but I am having some difficulty with it in the Classic interface.
  18. smyth13

    Initial/residual stress due to shot peening process

    I have been thinking about overlaying some layered shell elements on the solid with each layer containing a certain value of initial stress. I am not sure exactly how to implement this correctly though.....it is just a thought. Not even sure if it is possible.
  19. smyth13

    Initial/residual stress due to shot peening process

    I am trying to apply some initial compressive stress to the surface of a casting due to the shot peening process. I was wondering if anyone has any experience with this? I am looking to apply this initial stress as a function of depth into the surface. Does anyone know if this is possible...
  20. smyth13

    Extracting a pressure distribution from contact

    After performing a contact analysis, I would like to extract the applied pressure distribution on the contacted surface for use as an applied load on a different component with an identical contact surface. The nodal locations will not necessarily be identical. Is there a method for obtaining...

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