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Ashu

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  1. Hello Vikas, have you come up with any solution. I am looking for it
  2. OK, PFA the .hm file of the model. One request, since now you have the complete model, please just check out all the parameters we have taken and clarify whether we are doing it the right way or not, ONCE AND FOR ALL. WE ARE PERFORMING - GEOMETRIC NON-LINEAR IMPLICIT STATIC ANALYSIS, LOAD=1100N, MATERIAL= Ti-6Al-4V Grade 5 Alloy Hyperworks 13.0 Full VERSION and also, I wanted to plot the stress-strain curve for this strucutre......the stress and the strain(displacement in fact) values which I want to take on the plot are the peak values at each time-substep of the analysis. Can you tell me if it is possible to take out the tabular data with precisely these values so that i can export them to EXCEL. Direct plotting of GRAPH will also do, but i want it between these peak values of each substep. I tried through QUERY DATA in HyperView, but it required manual input of each time substep by selecting. Since, I will be making 10-12 structures more, I want to know if there is a direct method possible for this? THANKS A LOT FOR GOING THROUGH ALL THIS TROUBLE. IT REALLY MEANS A LOT TO OUR GROUP. X_555.hm
  3. PFA all the .out files (There were 4 of them, i have attached all) Actually i dont know about the starter, engine and main files.....i hope you can figure that out.... Thanks X_555.out X_555_001.out X_555_002.out X_555_rad_s1_0000.out
  4. Thanks a lot Vikas..... You cleared my doubt regarding the concepts, which in my opinion is rare on the forum. I am gonna use MATX02 as it follows the Johnson-Cook Material Model and most of the papers have this model used for defining the plasticity behaviour of material. Values of A, B and n : I am taking these from a paper in which they performed analysis on some porous structures of same Ti alloy. Right now I am facing these problems: the 2 errors which usually show up 1. #error 4001: Running RADIOSS starter, that's it.....this is the description. And it shows quite quickly. (Disabled the anti-virus, some say it works, but not here) No .h3d file is made...basically no analysis done. 2. #error 4079: Non-convergent error....its not the whole description....but it shows up after some time.....so in the results , analysis is done upto only a few substeps, the result cant converge. These two errors are bugging me on daily basis. Please tell what to usually check or do when these errors show up? And more important, what they actually mean. Parmaeters I am using: NLPARM: NINC=20 MAXITER=25 KSTEP(6) DEFAUT CONV: UPW and Values of EPSU, EPSP, EPSW ALL BY DEFAULT 0.001 rest are also default. I am guessing 2nd error has something to do with NLPARM. Absolutly no idea about 1st error. Please give suggestions. AND yes, if any more info regarding other parameters is required please do tell me. THANKS A LOT FOR HELPING.
  5. Thanks for the trouble Vikas...it really means a lot to me.... I wanted to ask some things: 1. When I use MATX02, it requires the value of Yield Stress of material....now since I am doing a compressive analysis I will use the compressive yield strength. But my confusion is this - its theoretical value which I usually found in many websites was around 800-950 MPa, which is the value in case of a standard specimen, but experimental values from some research papers suggest it to be only around 80-120 MPa. Now I have this understanding that the curve will start yielding from a point coming from this value of 'A' I provide to the solver. Is this true? This is the first confusion I am unable to clear. Also since I am performing the analysis on multiple strucutures, I will have to compare the results based on their yielding but what I wanted was to find out the yield point through the analysis, but if I myself am putting the value of yield stress than whats the difference? Can you give me some conceptual explaination regarding the actual relation of the parameter A with the output result? I am using a porous lattice structure but the values are of standardized solid specimen. So, is yield stress dependent on these factors? If yes, what value should I use?...... 2. In your previous replies, you told me that MATX02 is an approximation of the Johnson-Cook model and that MATX36 was accurate in these terms. But I wanted to know, which parameters do I need to input and how to I decide the values. Actually, I am not able to understand all the terms inside MATX36, and cant identify which ones to use in my case. Is there any tutorial for usage of MATX36 if yes please share it with me it will be really helpful. Sorry for asking so many things at once. Please do reply, especially regarding point one. BIG THANKS FOR HELPING ME OUT.
  6. Hello Vikas, PFA screenshots of analysis. I am still unable to get T01 file Please correct me if it has done wrongly. I have called output block before the analysis. I require a table consisting of values of stress and strain at timesteps.
  7. hello folks, we can output Stress and strain using output blocks. when we Go to Analaysis page>> Output Block>> elements. Card edit the created output block and change the keyword accordingly (BRIC for solid elemnts, SHEL for shell elements, etc..). All the requested information will be written to T01 file. but where to locate t01 FILE. please help in this query
  8. i have been doing the same as you told in first step. But where to find table T01 file. its not in analysis folder. please help
  9. Hello Vikas, i have encountered a fatal error in solving the file. #4002 Radioss engine failed And .h3d file hasn't formed after result? Can you elaborate the meaning of fatal error in result section. I am performing geometric non linear analysis on a structure.
  10. Thank you @vikas kenchapur for this helping reply. i will be looking forward to work acc. to ur guideline
  11. Hello folks, I am doing geometric non linear static analysis on a structure and got stuck into some elemental problems under the material section, material - matx02 some parameters are given such as A- plastic yield stress B - plastic hardening parameter n - plastic hardening coefficient C - strain rate coeff. EPSmax. max possible stress my questions (for titanium ti6al4v) 1. value of A: as per wiki it should be in 90-130 MPa but when I saw some papers value for yield stress was >900MPa 2. B- nothing got from google. what it actually signifies in reality. Please explain. 3. EPSMAX: does its value should be ultimate tensile stress. is there any website available where one can find the values of any material( specially - ti6al4v) in exactly these parameters? Has anyone got a research article or paper regarding this topic: "Geometric Non linear compressive analysis of Ti alloy using optistruct" Thanks n regards
  12. Hello folks, I am doing geometric non linear static analysis on a structure and got stuck into some elemental problems under the material section, material - matx02 some parameters are given such as A- plastic yield stress B - plastic hardening parameter n - plastic hardening coefficient C - strain rate coeff. EPSmax. max possible stress my questions (for titanium ti6al4v) 1. value of A: as per wiki it should be in 90-130 MPa but when I saw some papers value for yield stress was >900MPa 2. B- nothing got from google. what it actually signifies in reality. Please explain. 3. EPSMAX: does its value should be ultimate tensile stress. is there any website available where one can find the values of any material( specially - ti6al4v) in exactly these parameters? Has anyone got a research article or paper regarding this topic: "Geometric Non linear compressive analysis of Ti alloy using optistruct" Thanks n regards
  13. hi Marta, A lot of help material is present in Altair Hyperworks help. On your ribbons, you will find the help button<chrome opens<type your material name/matlaw74< all the parameters will be defined in that. Or simple search for fct_ID_E, or C_E in its search bar. you will get the desired info. Help me back 1. have you done non linear geometric analysis using optistruct or radioss ? 2. if yes, explain the significance of buttons under matx02(Johnson crook material) using optistruct. 3. I am trying to get stress strain curve for some lattice structures. Thanks n regards.
  14. hi Prakash, i am not using NLSTAT for this. I am using NLGEOM analysis type. please have a look at my .hm file
  15. Hi Punith, thank you for such a reply. I have looked further into the problem. And this issue was coming to the fact that the geometry imported was just composed of surface, hence hypermesh generated 2d mesh as well as temp2d tetra elements in case the body was solid(which was not). I have solved the issue by importing a solid geometry. Regards Ashutosh Gupta
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