Criterion of optimization of slow fatigue crack growth in metals and alloys

Abstract

Based on macro structural analysis of a typical fatigue fracture of a cylindrical specimen of alloy D16T with an annular notch in bending is shown the technique of constructing the kinetic diagram of slow growth of fatigue cracks in the light of the third coordinate - the number of cycles. It is shown the quantification of growth up cracks in the projection plane: of quantity of cycles - the speed of the crack. A kinematic diagram of slow growth of a fatigue crack gives the possibility to assess the beginning of intensive increase to a stable crack growth of 10-6 – 10-4 mm/cycle. It is technically difficult to monitor fatigue crack growth at this level of growth rate. This is why the beginning stage of the transition from a slow-growing fatigue crack to a stably growing crack is an important technological safety parameter in the operation of parts with cracks. This work proposes a new criterion of assessing the optimality of slow fatigue crack growth on the example of the aluminum alloy D16T.

About the authors

Yu. I. Kol’tsoun

Samara State Aerospace University

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

Doctor of Science (Engineering)

Professor at the common engineering education department

Russian Federation

D. P. Molyavko

Samara State Aerospace University

Email: dis164@mail.ru

Postgraduate student of the department at the common engineering education

Russian Federation

A. D. Ignatovskiy

Samara State Aerospace University

Email: dis164@mail.ru

Student

Russian Federation

T. A. Khibnik

Samara State Aerospace University

Email: tanya_hib@mail.ru

Candidate of Science (Engineering)

Assistant professor of machine design department

Russian Federation

References

  1. Kol’tsoun Yu.I., Khibnick T.A. Мethods calculation of fatigue crack growth period and her it's graphic generalization // Vestnik of the Samara State Aerospace University. 2009. No. 3(19), part 2. P. 70-79. (In Russ.)
  2. Pestrikov V.M., Morozov E.M. Mekhanika razrusheniya tverdykh tel [Mechanics of the solid body fracture]. Saint Petersburg: Professiya Publ., 2002. 300 p.

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