m_empty = {'E': 1.0E-20, 'NU': 0.0}
m_matrix = {'E': 29e2, 'NU': 0.4} # Carbon
m_fibers = {'E': 28e4, 'NU': 0.2} # Carbon

#m_matrix = {'E': 400, 'NU': 0.05} # Carbon
#m_fibers = {'E': 2e5, 'NU': 0.25} # Steel

#m_matrix = {'E': 750, 'NU': 0.17} # Carbon
#m_fibers = {'E': 2e5, 'NU': 0.25} # Steel