# Andy@LamteqSolutions

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## Everything posted by Andy@LamteqSolutions

Many thanks for your reply Simon and sorry I didn't see this earlier. Yea, we're still having issues with this value... I'm getting 36800 using v = 3e6 mm/sec (TNT based number) p = 1.68e-9 Mg/mm^3 Sel = 10x10 = 100 mm^2 Gap = 38 We have a test model which implies we need to be looking StFac 360 (as 36500 was barely making the component deform).. but when we apply that to another model the damage is vastly beyond what we would expect.

Hi all, I've been tasked with a problem and need to get my head around LaGrange-Eulerian contact. Overview. I have a plate structure positioned over an explosive. The Structure is mesh size 10mm. The explosive, air and ground are eulerian elements 25mm size. Problem When the explosive strikes the structure, one of two things occur. Either the volume fraction of explosive penetrates the plate and the plate deforms (I find this occurs with Stfval = 38500, gap = 38) or the volume fraction of explosive does not penetrate the plate but the plate remains largely undeformed with very small displacement (I find this occurs with Stfval > 100,000, gap = 38). Am assuming speed of sound to be 3000m/sec (best I could find for explosive). To my mind, the volume fraction should not penetrate the plate. Am a bit puzzled by the apparent lack of deflection in the structure when the explosive hits the structure. Output for the contact is giving me approximately the same force in all cases - although higher values of Stfval are giving higher forces (between 6.5-8e6N). There does seem to by much more contact energy in the lower Stfval runs. So I am tad confused. Any help would be much appreciated. Andy
3. ## Optistruct - Correct Settings to make full use of my CPU

Many thanks Rahul, hope you are well.
4. ## Optistruct - Correct Settings to make full use of my CPU

Hi, My pc is a 1 socket 4 core CPU (Intel(R) Core I7-6820HQ 2.7GHZ. Whilst running with (-checkel NO -out -core IN -np 4) I noticed that only 50% of my CPU was being used. Hyperthreading is off. I was just wondering, is there anyway I can get maximum CPU usage? Cheers in advance. Andy
5. ## Hyperstudy - How to Dictate which Thicknesses Hyperstudy investigates

Hi Rahul, I thought I'd just quickly touch base on this one. I ran a simplified model and it actually worked. Really bizarre but it did examine more thicknesses before settling on a final design. Not sure what was going on in my initial model (perhaps I'm challenging it a little hard and it's accepting the first answer... bit odd). Thanks for all your help. Cheers Andy
6. ## Hyperstudy - How to Dictate which Thicknesses Hyperstudy investigates

Hi Rahul, I managed to create a HSTX file however, I noticed that it contained the TPL file which is unfortunately commercially sensitive so I cannot share that file. However I have grabbed every screenshot I can. Failing this I can put together a simple model which should have the same issue (am assuming operator error on my part). Cheers, Andy
7. ## Hyperstudy - How to Dictate which Thicknesses Hyperstudy investigates

Hi Rahul, How strange. I did open it in 2019 as a test but I don't believe I saved it in 2019. I've rerun it using 2017, this time I set it to minimise mass but the problem is still the same. Kindest regards Andy Study_1.hstudy
8. ## Hyperstudy - How to Dictate which Thicknesses Hyperstudy investigates

Rahul, I was wondering if you could see where I am going wrong with my test. I've managed to set up hyperstudy to look at specific values and what I have is a plate with varying thicknesses on a structure with a loadcase applied. What I would like is the hyperstudy to minimise the volume without exceeding a stress value. I'm using Hyperstudy 2017.3 and have attached images from the response, objectives, constraints and the Evaluation Data. What the Hyperstudy seems to be doing is assessing 5mm thickness then 4.25mm thickness - which exceeds my stress limit but then stopping without examining 4.5 or 4.75mm. Do you see where I am going wrong? My stress limit is 341.3MPa. Many thanks in advance. Andy
9. ## Hyperstudy - How to Dictate which Thicknesses Hyperstudy investigates

Many thanks Rahul
10. ## Hyperstudy - How to Dictate which Thicknesses Hyperstudy investigates

Hi all, This question may be reasonably straight forward to answer (it isn't a trick question at all). When I perform a hyperstudy optimisation study with plate thickness being the variable. Is it possible to dictate what thicknesses I want hyperstudy to investigate? For instance, I have a structure with a plate where I want to know what thickness I can reasonably use without going over a stress limit but I also know that the thicknesses available are 5, 10, 16, 20 mm. How do I get hyperstudy to only look at those values? Cheers Andy

12. ## Create a list of displayed loadcollectors

I do apologise, I mistyped, Many thanks Tinh!
13. ## Create a list of displayed loadcollectors

Awesome, I will give it a go and let you know. Many thanks again Ting

15. ## Create a list of displayed loadcollectors

Hi all, I am trying to produce a script which lists displayed entities. Specifically, I am looking to write a script which displays all loadsteps, then creates a list of all loadcollectors, hides then reshows them and deletes all non-displayed loadcollectors. it seems a bit long winded but my model contains loadadd loadcollectors and when I come to delete unused loadcollectors it doesn't identify any... despite there being a good number which are in no way used. Cheers in advance Andy
16. ## HWTK GUI TOOLKIT Studio

Many thanks Tinh. I'll give it a go.
17. ## Optistruct - large contact forces

Cheers Mario, Will give it a go and let you know. Kindest regards Andy
18. ## Optistruct - large contact forces

Hi All, I seem to have a recurring issue and it doesn't seem to make much difference if I use S2S or N2S. I have a number of very similar models, all set up the same way and I would only expect a mild difference in stress distribution and contact. What I get is with some of the loadcases I have an extremely high contact force. Now I've encountered this before and have needed to switch to gaps but this time I really do need the contact forces exported. Here are some notes..... NLPARA = NINC 10 PARAM = CNTSTB Contact card = Adjust = auto, type = slide, MORIENT = Norm. In general, slave contact surface is smaller mesh size. I've added some images....
19. ## HWTK GUI TOOLKIT Studio

Perhaps I am not fully understanding what the GUI builder is meant to do but ideally I would like a tool to position buttons and text boxes as I am struggling with the pack commands in my scripts - I've added a pic to demonstrate my problem.
20. ## HWTK GUI TOOLKIT Studio

Cheers Tinh, Hope you are well. Yea, mine doesn't seem to have any options. All I get is a demo panel which shows me the various widgets and the code (assigned to those buttons) but nowhere to position buttons or read in code. Maybe there were more options I needed to click when installing the software and this is just a basic demo version? Cheers Andy
21. ## HWTK GUI TOOLKIT Studio

Does anyone know how to use HWTK studio to develop guis? I can't get my head around the positioning of buttons and text boxes so was hoping the HWTK gui toolkit doesn't seem to have anything like that in it. When I click file, all it offers me is Exit.... which isn't exceptionally useful.
22. ## How to pull Contact Results and create Pressure Loadcollector

Hypergraph you mean? Not tried that one.
23. ## How to pull Contact Results and create Pressure Loadcollector

Quick question everyone... Is it possible to extract contact forces in such a way that they can be imported into another model as a pressure? The model I have has wearpads with contact OPTI - so I get a text file with a force result for that contact, but when you open the result in Hyperview, you can clearly see how the force varies over the surface.. and that's what I need to simplify my model. Does anyone know how to extract that result? The image below is reported as a net of 13.4kN in the opti file yet clearly the majority is in the corner.
24. ## Can orphan nodes cause issues with converging

Many thanks, that's awesome, I'll make sure to add it to my quality control process.
25. ## Can orphan nodes cause issues with converging

Hi all, Been having issues with a model recently, previous versions of it have been converging but recently it seems to have just stopped converging. I've managed to get it to converge but after over an hour of processing (it should have taken 10 minutes), when viewed, there appears to be many orphan nodes. Can orphan nodes cause convergence issues? How can you get rid of them in hypermesh? Cheers Andy
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