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# Thiago Marinho

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8

1. ## PBEAM fatigue analysis

@Prakash Pagadala I'll try it. Thanks for helping!
2. ## Problems with Fatigue Analysis

@Nachiket Kadu I'm sorry, I don't understood very well about the sine function. If I use a simple sine function, how I represent it ?
3. ## Problems with Fatigue Analysis

@Nachiket Kadu Yes, I'm using signed von mises when I'm viewing fatigue. About the Rainflow, the cycle that I represented in the last post is it correct? Thanks for helping bro!!
4. ## PBEAM fatigue analysis

@Prakash Pagadala Thank you very much!! Have any method to convert the 1D line with PBEAM by 2D representing your section? I think doesn't.
5. ## Problems with Fatigue Analysis

@Prakash Pagadala Thanks for helping! Will I have a variable amplitude all right? Then if I represent in TABFAT like this (1.3395;2.679;1.3395;0) am I doing right? Does rainflow happens automatically? I understood that in this analysis the software will check that have a variable amplitude and will convert this automatically? Am I rigth?
6. ## Problems with Fatigue Analysis

I obtained this stress by the linear static analysis @Nachiket Kadu . I'm making anything wrong?
7. ## PBEAM fatigue analysis

I'm trying to make a fatigue analysis of a chassis. I meshed the chassis by 1D line mesh with PBEAM property. On FATDEF I put the option PBEAM in PTYPE area and when I try to analysis was showed the follow message: *** ERROR # 6817 *** PBAR/PWELD only can be used for spot weld fatigue analysis. PFATSPW is required for spot weld fatigue property. FATDEF ID = 9 PBAR/PWELD ID = 3 PFAT ID = 8. How I complete my fatigue analysis of my 1D elements?
8. ## Problems with Fatigue Analysis

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!
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