2000m water/10m/atm=200 atm ~3000 psi is this correct?
The syntactic foam route is worth looking into. We make FRP laminates and shapes incorporating glass microspheres. Compressive strengths exceed 15000 psi.
The biggest variable in determining critical fiber length is the shear strength between matrix and fiber. This interfacial shear strength in turn is governed by the relative shear moduli of the constituents and physical/chemical relations at the interface. Since the modulus of most matrices has...
Metals are reinforced for the same reasons as polymers: higher strength and stiffness, better impact properties, much higher fatigue allowables, the ability to design anisotropically.
Unlike polymers another benefit of reinforcing metals is that the density is usually reduced.
Predicting...
Kevlar will not help surface hardness any more than glass or carbon. Surface indentation hardness will increase with fiber volume fraction but may not get to the level you need. Indentation hardness is more a function of the matrix used. The general rule is that better hardness equals less...
Electrical insulators for lower voltage are usually track resistant thermoset polyester (NEMA grade GPO3) BMC but there are some thermoplastics used, for higher voltage they are epoxy or silicone. Material and style depends on voltage, environment and structural requirements.
Long fiber reinforced thermoplastics (LFTP) have more, not less, potential for warpage because the long fibers are much more prone to flow induced orientation.
Shrinkage is primarily a function of process temperatures and fiber volume fraction, there is nothing inherently better about LFTP...