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Found 35 results

  1. Hello everyone: I've been trying to do the optistruct tutorial OS-T: 1340 Fatigue (Stress - Life) Method but I'm new in this area and I have some questions about FATLOAD and its parameters. What exactly is LDM and what realitonship has with the load of the subcase? I've seen that loads for each subcase are respectively 1250 N and 1000 N. However both load histories are between 1 and -1 and with a scale of 3. Why is like that? Shouldn't it be with a scale of 1000 one and 1250 the other? In the case that instead of a punctual load there's a pressure or moment in one subcase, load histories need to be scaled to N to be consistent or they can stay in the units of the subcase load (Nmm or N/mm^2)?. How would you represent in the fatigue analysis static loads that contribute to the stress of the model but don't vary cyclicaly? I appreciate your time answering them.
  2. 以前のBlog投稿(https://web.altair.com/altairjapanblog/hyperlife-fatigue)の最後のほうに出てきたスクリプトになります。 表示されているNoteを消すボタンを追加しています。 使い方は https://web.altair.com/altairjapanblog/hyperlife-resultview の最後のほうに書いてある方法と同じです。 life_convert.tbc
  3. Good Morning Im performing a fatigue analysis to a femoral stem in Ti-6al-4V and CoCr alloy, i need to calculate the Factor of safety of the stem under cyclic loading but when i select FOS the program need as an input the TFL and HSS. I dont know this properties for the materials, im also trying to use hyperlife and perform the FOS analysis, but when y try to change the material it does not let me. Theres no other way to calculate the factor of safety without this parameters? Thanks for your collaboration Best regards Ivan
  4. Hi, I want to simulate fretting wear on a cylindrical roller bearing in HyperWorks. Example: McColl, I. R., et al. (2004). "Finite element simulation and experimental validation of fretting wear." Wear 256(11–12): 1114-1127. Could you please help me how to proceed? Thanks Arjun
  5. If we want to increase force as a step load method (step load method is when force done to an object is increased in to steps such as 200, 400, 600, and etc) in optistruct to analyze fatigue, what do we have to do? Show in figure
  6. Hı everyone, I want to do fatigue analysis. After Lattice Optimization, my model has 1d beams. How to convert from 1d element to shell element. Thank you
  7. Hello guys, I made an example of Random Response Fatigue Analysis. There are three loadstep in my model and there are FRA, Random and Fatiuge. the results of first two Loadsteps are not error. Though the fatigue subcase can run ,there is no any result in the subcase。 Lcid card refers to the Random subcase. And the Tid card is blank. the PFAT card was estimated by UTS. Would anyone can fix the problem out? 1pl.fem
  8. In a fatigue analysis setup in optistruct solver is it absolutely essential that the component to have no life (fatigue failure) if : - static analysis stress exceeds ultimate tensile strength of material component. - load time history 1 cycle is 0 1 0 Please provide some clarification regarding this matter.
  9. Hello, I am working on Bracket for which i have conducted FRF analysis. Now i what to carry out Fatigue analysis for that one at particular frequency before resonance. How can i carry this analysis now. Thanks in advance for Reply
  10. Hello, for a Fatigue Analysis I am using the LCID entry to refer to a transient reponse load case to evaluate stress history. My question in which manner the stress history is processed. If the Fatigue LC reads stress from h3d-file the output frequency for transient response analysis is very important. Thanks for your comments. JD
  11. Hi to everybody, i would like to perform a fatigue analysis using this method: -run the dynamic analysis in Motionsolve in order to extract the load spectrum -run the fatigue analysis in Optistruct using that load spectrum the problem is that the dynamic analysis needs 150000 seconds, and this means an enormous amount of time in Motion solve,it's almost impossible. So is there any other way i can perform this type of analysis? Thank you.
  12. Hi, I am trying to learn fatigue using optistruct , Please share me with the videos and fem files regarding fatigue. I already went through the fatigue tutorials in optistruct If I put all of the fatload into one fatevnt, are they now occurring simultaneously? How do I change the model that the loads occurs one after each other? Thankyou N.K
  13. I am doing the fatigue practice and at my practice file. I don't know what FATLOAD mean exactly. For example if our model today will subject a F=100N At TID I know we need to set the TABLE to input and when I plot the .csv file I seem it look like the Load Time History photo. So it this mean our total time is 2500 sec? And the load have positive and negative for scale 1 and -1? (At here our model will subject 100N & -100N for 2500sec) And the LDM I just can't know about it. Finally what is mean for the SCALE? Because we have load time history we can see our load is for 1 and -1. At here we set 3 so that means out load will scale for 3? (Final it will ill subject 300N & -300N for 2500sec)
  14. I know we can set material property of fatigue in MATFAT. And we can set the SN curve points of the material. I am curious about can we use the TABLE's type to import our material data in fatigue material? Because at the thermal we can do for this. And I also have problem about the FATPARM's instruction of COMBINE what is "SG" mean? Because I have seen it shown like the photo and it also written in SGVON (SG von-Mises)
  15. Hello, I was keen to know whether there is any way to conduct fatigue analysis of the lattice optimized geometry in Inspire or in any other software. Best, Tapan.
  16. hi, I would like to know if there is a trick to visualize fatigue results of an .odb file generated by FE-Safe. Because when I load the file to Hyperview, all the results generated are N/A ( Safety Factor , S/UTS etc) but exists when I open the same file into Abaqus Viewer for example. For info, additional fatigue step results is created by FE-SAFE after a required .odb loadcase results. Thank you.
  17. Dear All, Can we do assembly level fatigue analysis? I want to do Fatigue analysis of bearing assembly. If yes, Please provide the sample tutorial of fatigue analysis at assembly level.
  18. Hey guys, I’m a mechanical engineer student and I participate in a project where I analysis the structure of a modern tricycle. I need help with the fatigue analysis. I make the training of fatigue by Altair and tried make the analysis, but I’m not sure of the results. I think the problem it’s on the TABFAT. About the TABFAT: My analysis has 1D and 2D elements. I obtained the following values in the Linear Static Analysis: Analysis 1D Analysis 2D σ_max 24,59 MPa 267,9 Mpa σ_min -19,71 MPa 0 MPa Can I represent the load cycle of my “vehicle” like a sinusoidal curve? Can you show me how I represent it? Should I represent these values for each of the fatigue analysis like one analysis for 1D elements and other analysis for 2D elements? Can I “mix” these values for the two analyses representing σ_max = 24,59 MPa and σ_min = -19,71 MPa? I think that a correct method is consider my load cycle like a variable load, but I don’t obtain experimental data. About the MATFAT: I acquired the MATFAT data by the eFatigue website, but I don’t obtain the SE (standard error of log(N)). How I find out this? If I consider SE like “Default” (zero), how will affect my analysis? Note: I’m making a SN analysis. Thanks for helping!
  19. Hi, I'm trying to run a fatigue analysis using acceleration as load, but I don't know how to set the FATLOAD card with an acceleration load. My objective is to simulate a shacker test and verify the life and damage that the part will get when vibrates in 1G acceleration. Modal and frequency response analysis are ok, my only problem is with the fatigue analysis. If anyone knows how to proceed, please let me know. Thanks!
  20. I was trying to do Fatigue analysis (EN) in Optistruct according to the tutorials for Strain- cycles (EN) analysis. I gave input load time history table for the load from the tutorial folder (in C drive). I got an output as damage (s). But I want output as no. of cycles. How will I get that? In experimental constant strain controlled fatigue test, we perform the test for different strain amplitudes and we will get corresponding cycles of failure. I want to replicate the same in Optistruct. Is it possible in it? Please help me out. I am doing the analysis with standard tensile test specimen. Thanks in advance.
  21. Hello ! I am new to fatigue analysis in optistruct. For reference, I have followed the instructions as provided in the help file and with the same model as used in there (link has been provided for reference). I have been facing analysis failure with error code #6971. I have attached the screenshot of the error. Can anyone state the possible cause for this ? Help File Link : https://altairhyperworks.com/hwhelp/Altair/2017/help/hm/hwsolvers.htm?fpm_en_strain.htm Regards Venkatesh
  22. what material property are required for fatigue analysis ?
  23. Hi Everyone, I am working on project to carry out contact stress and later to do fatigue analysis. I am using Optistruct for this analysis. Image_01 shows how parts are assembled to each other. Image_02 & 03 shows that area of contacts I am interested in. I have attached .hm file for review. Can someone please guide me for how to define contacts between, 1. Inner diameter of housing to Outer diameter of Bush (Press fitted Bush) 2. Inner Diameter of Bush to Shaft diameter. (Shaft rotates on Bush ID) 3. Face of Shaft collar to Face of the Housing. Model is constrained at the Bolt location and Load of 200 Nm is applied at the center of Shaft. Aim is to Study the contact stress at Press fit area, Bush ID and Side face of collar of the Shaft. For Fatigue analysis, I would like to check if 200 Nm Load is applied at interval of every 2 sec, what would be the life of the Bush? Regards, Jagdish Shaft_bushing.hm
  24. Hi, I started to learn the fatigue simulation in Hyperworks. I got two questions. 1. I imported the cyclic loading file (in .csv format), and create new TABFAT load collector. However, I found there was only one column. In my original file, I have two column. The left column is time, and the right column is loading. But only the right column is kept. Why? Is it possible to import two columns together and define my own loading cycles? 2. In the Optistruct solver, I got errors: *** INTERNAL PROGRAMMING ERROR *** in file "fatdmgapp.F", at location # 1808. ioerr(1) = 4 **** ABORTING RUN DUE TO AN INTERNAL ERROR I don't understand what the "fatdmagapp" means. Here is the loading I applied. For each cycle, I have 9 values. Totally I have 2000 cycles. I couldn't see where is wrong. Can any one help me with this problem? PS: whenever I switched back to use Load1.csv from the tutorial file, everything works. So I am sure the other procedure is correct.
  25. Dear all, As I am quite new in fatigue analysis with optistruct I would like to confirm one thing please. We have two loads L1 and L2. Each of them has a FatLoad, so FATLoad1 FATLoad2. And we put them in a Fatseq - fatevn (so fatseq=fatenv=fatload1 + fatload2). Each load has a table (TABFAT) with two points which is: Tabfat1 ---> y1=0, y2=1 and Tafat2 ---> y1=1 and y2=0 So as you can see the two loads are out of phase. When load1=1 then load2=0 and when load1=0 then load load2=1. When we run the analysis, is this phase difference respected?? Basically I do not want to add stresses at the same time, but run fatigue as the two loads are happening on a cycle one after the other. So when we get the life out, we check how many times the part can survive the sequence: Load1-Load2 , load1-load2, load1- load2.......and not (Load1+load2), (Load1+load2), (Load1+load2).... Could someone please confirm if we understand that correctly, and if optistruct will work this way (maintain phase difference)? I hope I explained the problem clearly enough and I would be really grateful for any response.
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