Density-based methods
=======================


1. SIMP
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    .. math:: E = E_{min} + (E_{max} - E_{min}) \rho ^ p

2. RAMP
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    .. math:: E = \frac{\rho}{(1 + 8. * (1. - \rho)) * E_{max}}

3. code
-----------------  

.. code-block:: python

      if method =='SIMP':
          C = rho_e**3
      else: # for RAMP method
          C = rho_e/(1 + 8. * (1. - rho_e))

.. toctree::
  :maxdepth: 1
  :titlesonly: