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Force matrix using DMAP alter

Force matrix using DMAP alter

Force matrix using DMAP alter


Am able to extract the Stiffness and Mass matrices from Nastran using DMAP statments?

Would like to know how to extract Force matrix, when we do non-linear analyis using SOL 106.

Would be greatly helpful, if anyone has already done that.

Thanks and Regards,

RE: Force matrix using DMAP alter

That's not too easy to answer without knowing a bit more about what you want exactly. I assume you are seeking the applied loads (and not the element forces). You also need to decide what you want to get at - the applied loads, the loads from constraints, follower forces, of all the above. The best general advice I can give is to look at the inputs to the NLITER module in subDMAP NLSTATIC. Use the DMAP Programmer's guide to identify the various inputs, and be aware that some inputs will not be G size, and some will be in table format (SLT for example).

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