In this research the mechanical properties of PMMA polymer reinforced by
ceramic particles (silica) has been investigated. Many tests are performed on these
composites. The effects of the particles size and volume fraction on the mechanical
properties which include: ultimate tensile strength, elongation percentage, modulus
of elasticity, bending modulus, flexural strength, max. shear stress, impact strength
and fracture toughness were studied.
Statistical and mathematical analyses were used to the processing of the
experimental data. Mathematical models were done which show the mechanical
properties of composite materials as a function of particles size and volume
The results had revealed that the values of modulus of elasticity, elongation
percentage, tensile strength, bending modulus and max. shear stress increase with
the addition of SiO2 particles and with the increase of the volume fraction of them
and its reach the maximum value at (12% vol.) and (25 mm) particles size. The
values of fracture toughness and impact energy decrease with increase of volume
fraction. Silica particles with small particles size improved these properties more
than that of large particles size.