Quote:
Originally Posted by milt
..., but I suspect I need strong filler to attain the properties of the metals mentioned. ...
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The thing is, metals are isotropic materials, whereas any fiber-reinforced materials are anisotropic, or quasi-isotropic at best.
Material choice is a big part of the performance of so many designs. If you just 'throw some filler at it' you'll likely not get what you are expecting (metal like performance)
fwiw, There are a lot of high performance ceramics out there.