Crack growth resistance curve

Software engineering

Physics

Engineering

Composite material

Test data

Work (physics)

Metallurgy

Materials science

Programming language

Constant (computer programming)

Alloy

Computer science

Stress intensity factor

Fracture mechanics

Structural engineering

Paris' law

Crack closure

Bending

Titanium alloy

Thermodynamics

Engineering Fracture Mechanics

The purpose of the research is to apply the modified Hartman-Schijve equation for predicting small crack growth rate in an additive manufactured titanium Ti-6Al-4V. Material constants in the equation were determined by long crack test data, and the threshold value of the stress intensity factor range was set to a small value. A small fatigue crack test was conducted to validate the fitted equation. Predicted fatigue life of another specimen configuration under bending load agreed well with the test result. The work shows that it may be possible to represent both small and long crack growth rates by the modified Hartman-Schijve equation with its material constants being determined by long crack test.

Characterising and representing small crack growth in an additive manufactured titanium alloy