Hello
In this standard, safety-related parts of control systems, what does the 'd' of MTTFd mean? I know it means "dangerous (failure)", but it also talks about a safety system failing to operate.
If a safety system failing to operate places the machine it is protecting into a default safe...
Doesn't answer your question directly, but might help...
Also, look at the same link with a "15" at then end. I don't think there is a "standard percentage" like you are after.http://www.nafems.org/resources/knowledgebase/014/
321GO
In response to your post... 15 Apr 10 13:26.
I think you can work upto about 25% rather than 50% before the curves diverge, so upto around 25% of UTS you should be fine with your linear model.
If you end up having to do some fatigue analysis, remember my earlier point about grey iron...
With rb1957 here.
You seem to be reporting a "stress level" of 113MPa for grey iron, UTS 250MPa using a linear run. What you've actually got is a stress level for an elastic material for whatever E you've typed in. Stress-strain curve for grey iron isn't linear, and there is a massive...
My company is looking at purchasing this software. We currently have seats of Inventor where we can create pipes, adaptive or otherwise, with 3D sketches. Could anyone offer some experience-driven opinion please on what there is to gain from upgrading: for example, what can you do with Routed...
If you look at your "solution output" or "solution convergence" graph (can't remember the exact terminology, sorry) you should see two traces. These overlap when the solution has converged. For a bolt load analysis, the two traces have to converge twice: once for solving the bolt preload, and a...
What is the "rigid body motion error"? I think Workbench adds what it calls weak springs to remove rigid body motions and I seem to remember it doing this for bolted joints more often than many other types of analysis. If it has done this, I think (from memory, not used Workbench for a while)...
Well, I would start off with some small clearance around the bolt and ensure that there is no contact here. I'd then make sure there was a "split cylindrical surface" on the bolt shank where it is clear, and put at least 2 or 3 mesh elements lengthwise on this split surface. For your load apply...
Is the bolt going through a clearance hole (it needs to)?
Do you have a discrete cylindrical surface 'free in space' that you have applied your bolt load to, or have you applied it to the whole bolt shank?
Is there a nut on the other side of the grey bracket, or is it a blind hole you're...
ASME VIII and PED are not the same sort of thing - if you are familiar with ASME VIII and read the PED you will see what I mean. This link may not be up-to-date, but it is a good start.
Look at section 2.2.3(a). You can most likely use ASME VIII design rules to help you towards PED compliance...
Torque is not a good indicator of applied load for a bolt. With all other things being equal, you can expect a variation of +/- 25% for actual applied load using a wrench. Is this how you are applying your load?
Turn-of-nut is better, where you measure the angle turned by the nut. Measuring...
