Abaqus/CAE, or “Complete Abaqus Environment” (a recursive acronym and backronym with an obvious root inComputer-Aided Engineering). It is a software application used for both the modeling and analysis of mechanical components and assemblies (pre-processing) and visualizing the finite element. Sat, 2010-02-06 09:50 - Sprunger software. Download your Free Abaqus SE at: SIMULIA Academic programs would like to offer you a complimentary copy of our. The Abaqus Student Edition includes the core Abaqus products; Abaqus/Standard, Abaqus/Explicit, and Abaqus/CAE.
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Hello everyone, I'm currently doing a finite element analysis of a composite plate (45/0/0/-45/90/-45/0/0/45) under tensile load. I'm using 2 softwares to calculate the F.I. According Tsai Wu theory. Patran/Nastran gives me: FI (90deg ply) = 0.65, FI (45deg ply)=0.25 and FI(0deg ply) = -0.1 SAMCEF and hand calculations gives me the same results. However, when I run the analysis in Abaqus, I have some problems. All the stresses (S11,S12,S22) in each ply are the same as Patran or Samcef but the Tsai Wu failure indices are different.
FI (90deg ply) = 0.65, FI (45deg ply)=0.35 and FI(0deg ply) = 0.21 I have checked the allowable stresses but it's ok. In addition to that, failure indices according the max stress theory match the results coming from Patran. Moreover, if I perform hand calculations with the stresses given by Abaqus and the tsai wu equation given in Abaqus documentation, I get the Patran results. But Abaqus viewer plots the wrong indices. I have heard about the fact that Abaqus does not manage the negative failure indices.
Does anyone of you could help me to overcome this problem??? Thank you RE: Abaqus VS Patran/Nastran for Tsai Wu (Mechanical) 27 Jul 11 04:17.
The failure indexes really should tie up. It sounds as though there's a problem with Abaqus and Tsai-Wu, but that seems very unlikely. These sort of post-processing activities should be realtively simple to implement and be subject only to 'finger trouble' types of errors in coding. You say that you've heard that 'Abaqus does not manage the negative failure indices.' It really shouldn't matter. A negative Tsai-Wu FI is certainly possible.
For what it's worth the closest I can get is 90° ply 0.62, 45° ply 0.26 and 0° plies -0.016 for that layup in carbon under tension. That's at ply centrelines.
It's possible that Abaqus and whatever that bit of Patran is are using ply extremeties vs. Centrelines to recover stresses, but then the stresses should show a difference.
Neupro Patch Coupons. There can be problems with failure indexes and conversion to RFs, where Tsai-Wu needs a conversion using a quadratic equation, which some people don't implement for some reason. However, that shouldn't affect the FI. Because this sort of work is dependent only on the stresses in a ply it shouldn't be dependent on the actual FE analysis methods; it should work with Abaqus explicit and implicit. (Different analysis techniques will cetainly make a difference to the stresses, but not the derivation of something as crude as FIs from those stresses. If your stresses aren't different then neither should your FIs be.) Try to understand possible limits for the FIs in Abaqus. If you can isolate an apparent problem that is general and not specific to one loading and material/layup combination, then you'll have a problem that you can take to their help service.
For instance, try to isolate the behaviour with simpler loading such as some even simpler layups with unidirectional loading. RE: Abaqus VS Patran/Nastran for Tsai Wu (Aeronautics). MorAero: you need red flag your current post and start a new thread with a new title (maybe along the lines of 'failure indexes for solid anisotropic elements in Nastran' or similar).
I have to say I'm not at all sure how to get this, other than by post-processing the element stresses/strains in a spreadsheet. Composite 3D elements in Nastran are used relatively rarely in my experience, and mostly for sandwich. There aren't that many true 3D failure criteria for laminates, if that is what you have. RE: Abaqus VS Patran/Nastran for Tsai Wu (Aerospace) 16 Jan 12 20:43. Also ensure your Abaqus element type matches the Nastran integration order, it must be equivalent to the CQUAD/CTRIA Nastran Mindlin to get equivalent results. It's wise to test mesh resolution sensitivity before bouncing between solvers.