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I ran the Johnson cook model in a static environment and the results were a bit weird. I thought it took into account permanent plastic deformation, however, the flange of the crimp popped back after the roll die cold-formed it. The crimp should've clearly been deformed. Johnson cook is meant...

Thanks, L K. I don't have a good understanding of the Johnson-Cook material model for 7075-T6 (material I'm analyzing). I've done some preliminary research and have found some constants online (attached), but can't seem to find some constants ansys is looking for. I've found Ansys has some...

Hi Guys, I'm running a Primer crimp simulation. In step one, I'm applying a displacement to a roll die and plastically deforming a crimp on a primer. From there, I want to apply a pressure trace to the internal faces of the primer to see if it holds. I've been running this simulation in the...

Hey Guys, I'll be running a pendulum test to test gun recoil. The platform is around 100 lbs and will be supported by 2 steel bars about 8 feet long and 20lbs each. Would it be safe to ignore the weight of the metal arms because they are so long? Thanks, Alex

Thanks NRP99. That was very useful. Did what you advised, but still got similar results, still failing, however FOS to ultimate is around 0.87 using Equivalent Von Mises now. I'm wondering if I should use a different failure criterion. The upper portion of the crimp is in compression, couldn't...

Hey Guys, I'm running a quasi-static non-linear FEA in Ansys trying to simulate crimping a primer into the cartridge using a die crimp tool. In short, the crimping operation works in real life (80 units tested), to which I've decided to try to simulate. However, the result of the simulation...

Yeah, have already done that from the start (large Deflection). Simulation would crash if large deflection wasn't activated. I put in a friction coefficient of around .2 (aluminum to brass), however it didn't make any real impact. --Alex

Is it possible the pieces in real life are being work hardened by the crimp, and thus attaining a higher ultimate strength?

If you take a look at the video I posted, all the elements in red are above .88-.99 ult FOS to von mises failure criterion.

Yeah, I'm trying to understand what benefit applying a force would have as opposed to a displacement value?? They should achieve the same result. And yes, I'm using True -stress strain curve, not the engineering stress. It is a substantial amount of elements, however, they are very marginal--...

Thanks for the reply, L K. I'm very concerned about the stresses the crimped material exhibits when the die comes down and pinches it to the primer. Some portions of the material are above it's Von Mises Maximum ultimate tensile strength when it undergoes the crimping process (as shown in red)...

Hey Guys, I'm running a quasi-static non-linear FEA in Ansys trying to simulate crimping a primer into the cartridge using a die crimp tool. In short, the crimping operation works in real life (80 units tested), to which I've decided to try to simulate. However, the results of the simulation...

Hey Guys, I'm running a quasi-static non-linear FEA in Ansys trying to simulate crimping a primer into the cartridge using a die crimp tool. In short, the crimping operation works in real life (80 units tested), to which I've decided to try to simulate. However, the results of the simulation...

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Hi All, I'm currently working on a project that involves measuring pressure of a material being cast. A test cast was designed in which threaded holes were machined in order to accommodate pressure transducers; which act as a part of the cast wall when inserted. I am interested in measuring the...

Sorry, bad grammar. I've been getting higher pressure readings on the OD of the part as compared to the surface of the part. We are applying a pressure only to the top surface.

Hi Guys, I currently investigating a casting procedure that the company i have been working for has had a lot of issues with. So I outfitted this with pressure transducers and load cells. I applied to load cells on the top and bottom of the cast, and pressure transducers on the OD of the cast...

BrianE22, This is a piston the is operated by a hydraulic system. The force is coming from the top down, which is 1 load path thru the pressure trandsucer.

Tbuelna, yes i have recently changed the design because of this. So know to get an accurate load cell measurement i must subtract the weight of the piston.

ALso, please ignore symbols, these are just NX mating symbols. THanks,