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Convergence issue with tensile test for composite laminates

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Topic starter
(@jiiuhuii)
Barista
Joined: 6 months ago

Hi there,

I'm modelling the tensile test for composite laminates using ANSYS Static Structural. Two displacement loads were added to two sides of the model. I used the Hashin criterion as failure initiation criteria, and material property degradation as damage evolution law. I added an interface layer between each ply in laminates for cohesive zone modelling. The experiment showed the specimen will fail when displacement reaches around 0.85 mm, but the model failed to converge at around 0.5 mm. I tried to turn on weak spring, large deflection, and set unsymmetric Newton-Raphson option and Stabilization, the model still failed to converge. Does anyone know how to solve this problem?

Thanks!

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Negative Volume
Posts: 639
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(@negativevolume)
CEO
Joined: 5 years ago

Hi @jiiuhuii

Have you tried adjusting the number of cells? I know variation in mesh density is a common culprit for convergence failure. 

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Negative Volume
Posts: 639
Admin
(@negativevolume)
CEO
Joined: 5 years ago

You can also look at the residual force plots to find the trouble spots. I would assume there's a problem with the interface between the layers. 

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