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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!
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.