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Hi hertfordshirep, As SWComposites mentions, if you are using linear elastic material properties, the only nonlinearity you would see in a load-displacement curve would be from nonlinear geometric effects or maybe a bit from contact nonlinearity. Also as SW alludes too, this is a challenging...

Hi ATX, As Greg mentioned, developing a post-processor might not be worth your time. I think there is more room for improvement on the pre-processor side, especially non graphics intense tools that just do things like convert input files from one solver form to another (Abaqus format to Ansys...

Hi Jim, I have found "Mechanics of Fibrous Composites" by Herakovich very useful. -Dan Dan Milligan Firehole Composites (www.firehole.com) FHC provides software and consulting for analysis of composite structures.

Hi paperboy, I assume you are trying to import the existing Abaqus model (input file, .inp) into CAE. There are some keywords that are a few versions behind and the graphical preprocessor (Abaqus CAE) does not handle them yet. You'll only be able to submit the job from the command prompt and...

Hi Vocs, The convergence difficulties using cohesive elements in Abaqus is a well known and shared frustration among FEA users...so rest assured that you are not doing anything incorrectly. There is a new product coming out in March/April from Firehole Composites that provides an add-on to...

Although Rob brings up a good point about people in this forum being biased...I assure you this is an unbiased opinion as I have used Abaqus and Ansys extensively in my career. I would recommend Abaqus over Ansys in terms of both capability and ease of use. One thing to consider however is...

Hi Jim, The following link may help you out in your design process (particularly page 118 regarding your root connection question): http://ns7.freeheberg.com/~mach085/Guidelines_for_Design_of_Wind_Turbines.pdf If you are looking for some software to help out in your design, I would recommend...

Hi Brian, Could you expand on the textbook solutions you mention? I am familiar with the rule-of-mixtures type equations back from my days in school but cannot recall anything that was semi-empirical. Also, can you fill us in on these "variables" that affect an ideal solution? Thanks for the...

Hi ysm, In your case you may want to use Rigid Body Constraints or Kinematic Coupling Constraints. With those methods, you can define a reference point at any location and then describe how the load applied to the reference point is transferred to the actual part. Kinematic Coupling...

Hi Jlog, I've had a similar experience myself and unfortunately was not able to resolve it and had to resort to starting over on my model. Some things you may try: - make sure you go to the assembly module and click on Feature-Regenerate. - instead of submitting your job through CAE, write...

Hi Rameel, The method you are describing is perfectly acceptable, although it may be a little tedious. I assume you have fiber and matrix material data and are trying to characterize a composite lamina. If that is the case, I suggest using Helius:MatSim, a free online material simulator...

ysm, There are many options for achieving the loading you describe. You can use Kinematic Coupling Constraints, Rigid Body Constraints, Equation Constraints, ... (there may be more). I like to use Equation Constraints. In this case you define two node sets on the surface you want to apply a...

Odforu - I would recommend having a constraint on the pressure application face to force all the nodes to have the same axial displacement. Then you can select a single node on that face to get your displacement variable. As an aside, what are hoping to gain from a stress-strain curve if you...

Comppro - I think we're both speaking too generally and need to nail down some specifics, here's an abstract from a paper by Breiling and Adams that better explains what I'm referring to... Layer nesting refers to the interaction between neighboring fabric layers of a textile composite...

RPstress, Great point about being careful how harness satins are stacked. If you stack a group of harness satins all the same "direction" (meaning, say warp side down every time), you have to worry about "nesting" issues when fiber tows from surrounding plies fill in matrix pockets during...

Interesting... jjprototype, are you facing some design issues because the strengths are significantly different?

SW - good point on the compression strength, but woven fabrics typically are not used for compression dominated structures because of the predisposition of the fiber to buckling, right?

I wonder this myself jjprototype. This is my thought process: The higher degree of waviness in the fill direction would explain why the stiffness might be lower. However, to fail a tow would require the bundle to straighten out after the matrix pockets around the bundles have failed...

SWComposites/ESPComposites, Thank you for the references. I'll have to see if I can find a copy and take a look.

ESPcomposites, CompositePro is great for initial sizing and for determining far field failure initiation and propagation. For detail work I use hand-calculations and FEA to finish the design/analysis off. Hand-Calculations for quick failure initiation load checks and FEA for determining how...