Learning Forum

[Webster]

Hi all,

I am attempting to use MAT 295 (*MAT_ANISOTROPIC_HYPERELASTIC) model on smp R13 (the distro released with ANSYS 2023 R2 installation package), on a Windows PC; and received the following error right after the keyword reader: 

forrtl: severe (153): allocatable array or pointer is not allocated

The problem is specific raised from the keyword *MAT_ANISOTROPIC_HYPERELASTIC, as the model was tested extensively with other material models. Here I attach the keyword deck, units are mks.

Also as per instructed, I defined a coordinate system to use globally orthotropic feature AOPT=2.

Could anyone who has experiences with the keyword kindly come and help? Much appreciated.  

[Pedram Samadian]

Hi,

The error probably indicates an issue with how the material model has been initialized during the simulation. Please see the following tips to hopefully fix the issue:

• Check if all the required parameters for *MAT_295 have been provided and are consistent with the material model requirements as per LS-DYNA Keyword User’s Manual Vol. 2 (LSDYNA Manuals).
• Change the solver to MPP. This solver often handles memory allocation differently and may avoid this problem.
• Check the cards used in your input deck file using LS-Prepost (the “model check” feature in the keyword manager) or a similar tool to ensure there are no syntax errors.
• Increase the memory allocation for the LS-DYNA using the *keyword card.
• Consider using newer versions of the LS-DYNA solver, which are available at LS-DYNA (user=user) Download Page (Username: user & Password: computer).

I hope these suggestions are helpful.

Thanks,

Pedram