15 February 2021 4 3K Report

Hi! Thank you for your time, attention, and support.

I am currently using FEM solver Abaqus to perform a set of balloon inflation simulations, trying to understand the deformation shape, stress, and strain when a positive pressure is applied to the internal chamber of the balloon.

The material I considered is silicone rubber Ecoflex30, with 900% elongation at break (https://www.smooth-on.com/tb/files/ECOFLEX_SERIES_TB.pdf); the material model I implemented is a built-in hyperelastic Neo-Hookean model; the type of element adopted is C3D10MH (i.e. standard, quadratic, 3D stress, hybrid formulation tet); I firstly considered a static step with nonlinear geometry on. The solver managed to simulate the inflation behavior until the max strain (LE) reaches to ~175%, then it aborts. I also tried with dynamic explicit step yet unrealistic deformation occurred after certain increments.

In this context, I am wondering if Abaqus itself is capable to perform such simulation, say if I need the strain reaches up to 300%? If not, any suggestions for a numerical solver that is effective for this kind of large inflation simulation?

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