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...
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...
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"...
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...
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...
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...
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!
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...
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...
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 -...
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...
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...
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...
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...
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...
