function creatematerialdict()
  Dict(
    :steel => (sg=0.283, ea=29.0e6, er=29.0e6, gj=11.5e6),
    :monel => (sg=0.319, ea=26.0e6, er=26.0e6, gj=9.9e6),
    :titanium => (sg=0.164, ea=15.5e6, er=15.5e6, gj=5.9e6),
    :aluminium => (sg=0.1, ea=10.3e6, er=10.3e6, gj=3.9e6),
  ) 
end