PSI - Issue 42

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 tr t r l I t rit r i ( ) Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ il l li t . i i t.

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ScienceDirect

Procedia Structural Integrity 42 (2022) 545–552

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 Abstract In this study, the limiting state determination of the aluminum alloy 2024 under a complex stress state was carried out. The purpose of the study is to determine the effect of accumulated damage in a material under a complex stress state on the characteristics of the material's bearing capacity. Various types of combined loading by tension, compression, torsion and internal pressure are considered. The object of numerical and experimental studies is a hollow cylindrical specimen with notch. In the numerical part, the exponential and power approximating function was used as the law of isotropic hardening. The damage accumulation law Lemaitre was used to determine the damage parameter. The generalized law of damage accumulation Lemaitre and the law of isotropic hardening were integrated into the ANSYS finite element code in the form of a dynamically linked library of user material for three-dimensional problems. Stress-strain state fields, damage fields, as well as the values of limiting stresses under various types of loading are obtained. Comparison study of different limiting stress state theories were numerically performed with take into account the damage accumulation under complex stress state. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: complex stress state, damage parameter, multiaxis, Lemaitre model, finite element method.. 1. Introduction The behavior of structural materials under a complex stress state has been the subject of theoretical, experimental, and numerical studies for many years. Under operational conditions, structural elements are subject to several loading components, such as tensile and compressive forces, internal pressure, bending and torsional moments In such structural elements as the landing gear of an aircraft, there are internal and external stress concentrators in the form of t i t , t li iti t t t i ti t l i ll l t t t i t. t t i t t i t t l t i t i l l t t t t t i ti t t i l' i it . i t i l i t i , i , t i i t l i . j t i l i t l t i i ll li i l i it t . t i l t, t ti l i ti ti t l i t i i . l ti l it t t i t t . li l l ti it t l i t i i i t t i t t i it l t i t i ll li li t i l t i i l l . t t i t t i l , i l , ll t l li iti t i t l i t i . i t i t li iti t t t t i i ll it t i t t t l ti l t t t . t . li l i . . i i rti l t li tt :// ti . /li / / . / i i ilit t : l tr t t , r t r, lti i , itr l, fi it l t t .. . i i t t l t i l l t t t t j t t ti l, i t l, i l t i . ti l iti , t t l l t j t t l l i t , t il i , i t l , i t i l t t t l l t t l i i t, t i t l t l t t t i t 23 European Conference on Fracture - ECF23 Complex stress state analysis for aluminum alloy accounting for damage accumulation D. Kosov a *, D. Fedorenkov a , A. Tumanov a FRC Kazan Scientific Center, Russian Academy of Sciences, Lobachevsky Str., 2/31, Kazan 420111, Russia v a a a i tifi t , i f i , t ., / , , i

* Corresponding author. Tel.: +7-843-231-9137; fax: +7-843-236-3102. E-mail address: dima45001@gmail.com i t r. l.: - - - ; f : - - - . - il : i il. rr

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 l i r . . i i rti l r t - - li ( tt :// r ti . r /li / - - / . /) i i ilit t - t r . li

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.069