On the method of the damage accumulation analysis in front of the fatigue crack in thin plates

Автор(и)

  • А. В. Плащинська Інститут механіки ім. С.П.Тимошенка НАН України, 03057, м. Київ, вул. Петра Нестерова, 3 https://orcid.org/0000-0002-2654-5143

DOI:

https://doi.org/10.17721/1812-5409.2021/3.16

Ключові слова:

тріщина втоми, пошкодження, тонка пластина, асиметричний цикл навантаження

Анотація

The problem on modeling the process of damage accumulation along the fracture front at fatigue in a thin isotropic plate is considered. The solution of the problem is based on joined of the concepts of fracture mechanics and mechanics of continuous damage. A numerical solution of the integral equation of crack front motion is proposed. Consideration of this equation as a superposition of a set of recurrent equations for each moment allows us to model the jumping nature of the fatigue crack growth and take into account the history of damage accumulation in the plate material during loading. A numerical solution of the test problem on the fatigue crack propagation in a thin plate made of aluminum alloy 7075-T6 with uniaxial asymmetric cyclic tension-compression is obtained. The constructed dependences of the fatigue crack length on the number of load cycles agree satisfactorily with the experimental data.

Pages of the article in the issue: 89 - 92

Language of the article: Ukrainian

Посилання

GOLUB V.P, PLASHCHINSKAYA A.V. (1994) Fatigue fracture model for thin isotropic plates with cracks in axial loading. International applied mechanics, 30 (7). P. 520-529.

GOLUB V.P, PLASHCHINSKAYA A.V. (2018) On the theory of growth of fatique mode I cracks in thin isotropic plates of finite size under uniaxial tension-compression. International Applied Mechanics, 54 (2). – P. 188-206.

GOLUB V.P., PELYKH V.N., POGREBNYAK A.D. (2010). Prognozirovanie ustalostnoy dolgovechnosti prizmaticheskikh metallicheskikh sterzhney pri asimmetrichnom rastyazhenii-szhatii metodom ekvivalentnykh napryazheniy. Visnyk nacional`nogo tekhnichnogo universytetu Ukrayiny` „KPI”, 58, p. 177-182.

RICE J.R. (1967) Mechanics of crack tip deformation and extension by fatigue. ASTM STP 415, Fatigue Crack Propagation. – P. 247-309.

NEWMAN J.C., JR. (1992) FASTRAN-II – A fatigue crack growth structural analysis program. – NASA-TM-104159. – 103 p.

HUDSON C.M., SCARDINA J.T. (1967). Effect of stress ratio on fatigue-crack growth in 7075-T6 aluminum-alloy sheet. NASA TMX-60125.

Завантаження

Опубліковано

07.12.2021

Номер

Розділ

Диференціальні рівняння, математична фізика та механіка

Як цитувати

Плащинська, А. В. (2021). On the method of the damage accumulation analysis in front of the fatigue crack in thin plates. Вісник Київського національного університету імені Тараса Шевченка. Фізико-математичні науки, 3, 89-92. https://doi.org/10.17721/1812-5409.2021/3.16