# 4.1.0: FAQ

## Why can Karamba3D calculate so fast – what is the solver behind?

The calculation part of Karamba3D is implemented in C++ and utilizes parallelization whenever possible. The solver used in Karamba3D is Pardiso which comes as part of Intels Math kernel Library (MKL)

## What are the calculation methods?

In the case of beams a power series approach is used for calculating the element stiffness and states at arbitrary positions along the elements. The method is based on that developed by Helmut Rubin and includes second order theory. The beam formulation is based on the Timoshenko-Ehrenfest beam theory and includes shear deformations.

The triangular shell elements are based on the TRIC element by Argyris and are currently based on a Euler-Bernoulli approach where the line initially perpendicular to the middle plane remains perpendicular to the deformed configuration.

## What is the buckling calculation method?

Buckling calculations in Karamba3D are based on the solution of the general Eigenvalue problem which involves the elastic and geometric stiffness matrices of the system. The solution of the Eigenvalue problem is done via Arpack which utilizes the Implicitly Restarted Arnoldi Method.


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