Fatigue crack propagation in a particulate reinforced metal matrix composite

This study concerns the characterization of crack-propagation properties of a metal matrix composite made of a titanium matrix (Ti6242) reinforced by TiC particulate (Vf = 10%). This kind of material is usually employed for aero-engine applications. The inquire aim is formulating a damage model able to describe the crack-growth phenomenon due to fatigue loads. The experimental analyses were carried out by round-CT specimens and the back face strain gage technique was used to evaluate the crack-closure effect. With the experimental data, the material parameters for a new model, that was proposed for crack-propagation in aluminum matrix composite material and is able to evaluate the crack-closure effect, are calculated; furthermore, a new experimental data processing method is presented.