Study on fatigue and crack propagation of titanium alloy laminated structure

icaf2023 Tracking Number 62

Titanium alloy laminate structure is a kind of interlayer hybrid composite material, which is made up of titanium alloy laminate and graphite fiber, and solidified under certain temperature and pressure. Compared with the fiber laminate with aluminum alloy, the titanium alloy laminate structure can improve the strength, modulus and notch impact resistance of the laminate, it also have wide temperature range, good corrosion resistance and better fatigue resistance of the laminate. In this paper, an analytical model considering fatigue crack propagation under lamination is established based on the judgment criterion of laminated crack of composite materials and the law of fatigue crack propagation of metal, and the crack growth rate of titanium alloy laminated structure under different lamination forms is predicted. The accuracy of the analytical method and model is verified by comparing with the experimental data. It provides an effective way to calculate the crack propagation of titanium alloy laminated structure, and has important theoretical significance and engineering application value for making full use of the potential of this kind of material to design and evaluate the safety life.