3D-kinetic characteristics of slow fatigue crack growth in the aluminum alloy D16T


It is presented the technique based on macro structural analysis of a typical fatigue fracture of a cylindrical specimen of alloy D16T with an annular notch in bending of constructing the diagram of stress intensity coefficient defined the period growth of fatigue crack. Analytical calculation of the change in the exponent m in Peris’ formula for calculating the speed of fatigue crack growth with respect to depth a in a system with consideration of the increase in the number of cycles N of high-cycle fatigue has be established using experimental data of fatigue fractures of the aluminum alloy D16T. This made it possible to draw the kinematic diagram of a slow fatigue crack growth of D16T in a 3-dimensional coordinate system. Analyzed and numerically determine volumes are formed with the space curve the kinetic diagram of a slow fatigue crack growth. Installed a new kinetic characteristic of fatigue crack growth; i.e. the amount of work of the stress intensity coefficient used to connect parameters of low-cycle fatigue and high-cycle fatigue.

About the authors

Yu. I. Kol’tsoun

Samara State Aerospace University

Author for correspondence.
Email: koltsoun_y.i@mail.ru

Russian Federation

Doctor of Science (Engineering)

Professor at the common engineering education department

D. P. Molyavko

OAO "Salut"

Email: darenok@inboxl.ru

Russian Federation

Specialist in the department of strength

A. D. Ignatovskiy

Samara State Aerospace University

Email: dis164@mail.ru

Russian Federation

Student of faculty of aircraft engines

T. A. Khibnik

Samara State Aerospace University

Email: tanya_hib@mail.ru

Russian Federation

Candidate of Science (Engineering)

Assistant professor of machine design department


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