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Hi, Is there a function in ANSYS which can recreate the ABAQUS 'free body cut' behaviour? It lets you take a slice through the model and obtain the forces and moments acting about a point in the sliced cross section. I need it to check that a shell model of a wind turbine blade is seeing the...

I am coding up a non-linear dynamic simulation of some wind turbine blade test equipment. The blade is cantilevered from a mounting structure and fatigue tested by reciprocating a large mass that is mounted to the blade at the resonant frequency of the system. The blade and its mounting...

Thanks caoimhin1, that's very useful. Do you have a very rough idea what kind of Hertzian contact stress would be allowable? This is just for future reference, as I think I'm going to take your advice and try to have a more major design rework to eliminate the need for a thrust bearing in the...

Hi Everyone, I'm working on a BMX bicycle hub, and space is at a premium to say the least. This is because the design of the hub means that the bearings must be fitted underneath the driving sprocket, which has 9 teeth and is designed for a chain with a 1/2" pitch. This effectively places an...

Hi All, I'm writing a MatLab script to read the Abaqus input file for a shell element model of a wind turbine blade and output its beam properties at various points along its length. The input file contains various data that spread across two lines, such as elastic properties for materials...

Thanks, I've actually decided to use the signed von mises stress (I found it on the fatigue part of the Ansys website). In Excel code: SignedVM=if(abs(Sig1)>abs(Sig3),sign(Sig1),sign(Sig3))*VM You're right about the energy in the stress strain curve, the original formula in my first post is...

Hi, I'm developing an in house code for analysing polymers. The algorithm I'm using to check when failure will occur is temperature dependent, so we need a formula for calculating how much the temperature will rise due to stress cycling. I've found the formula...

I never found out how to do this in Abaqus I'm afraid... I ended up writing a MATLAB code based on stuff in this book...

Hi, Does anyone know how to view the stresses in different layers of a composite in Abaqus/Visualisation? At the moment I can only view the results in the top layer of the stack. I have outputted stresses at all levels in the laminate. Thanks, Pete

Hi, I have a shell element model of a wind turbine blade in Abaqus. The company I'm doing the work for uses an in house mesh generator to build the model from information about the exterior surface of the blade and the lay ups, which I believe interfaces with PATRAN. I'm using Abaqus/CAE, so...

corus, I need the beam elements as shell elements cannot be used as an input to the wind turbine simulation tool I am using. loki3000, How would I work this out with scripting? And I am based in the UK.

Hi Mark, Thanks for that, it's definitely an idea. I'm not sure if Abaqus can display shell thicknesses... I haven't found it yet if it can(still very much a novice). However I do know them so I could get the beam properties by doing something like what you suggest. The only problem I can...

Hi Mark, That's exactly right. At the moment I have the .inp file (the company I'm working with uses Patran) but I could probably get a hold of the CAD model if necessary - although I have no idea how a CAD model of a composite structure manifests itself; is it just a surface with layup...

Hi, I have modelled a wind turbine blade in Abaqus/CAE. It is made from a variety of different composite lay ups, so I have used composite shell elements to model it. I have some wind turbine specific simulation software, but it requires beam section properties (bending stiffnesses, shear...

hi, i'm working on modelling a wind turbine blade. I have loads derived from wind turbine simulation software which utilises a beam element model of the blade. This is in the form of a time history of the axial force, torsion moment, and a 2 bending moment and shear forces. I have built a full...

Don't seem to be able to edit posts... the displacement lags the input force by 90 degrees.

Thanks a lot for those tips... In answer to your questions... I need to use Cd 4.5... this I suspect is due to the fact that as the blade travels down it pulls air with it, so when it goes up it is meeting air that is still travellling downwards (if you catch my drift). As F is proportional to...

I should probably also mention that the air around the blade would be completely static if the blade were not moving.

Hi, I am working on a simulation tool for wind turbine blade fatigue testing. The gif on this page is worth a thousand words... http://www.talentfactory.dk/en/tour/manu/bladtest.htm I have written a beam element FEA code in MATLAB that allows a transient analysis to be performed. It works...

Hi, I'm doing a frequency response analysis on a cantilevered beam. I'm interested in the moments along the length of the beam when it is being forced at its natural frequency. I've modelled it with beam elements and performed a modal analysis initially, with all the output file options...