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Registration Number

0220U102831, 0117U000629 , R & D reports

Title

Development of thermomechanical methods of regulating stress to increasing the durability of elements of constructions

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Head

Maksymovych Olesya V, Доктор технічних наук

Registration Date

11-06-2020

Organization

Lutsk National Technical University

Description

 The project aims at developing methods for increasing the strength and durability of thin-walled structural members by regulating stress concentrations in the areas of probable origin of fracture. A new method of finding the shape of holes in composite plates with a low level of stress concentration is developed, including taking into account the strength anisotropy of the material.To develop the method, a new algorithm for determining the stress state of anisotropic multi-connected plates based on singular integral equations is obtained, which is obtained on the basis of established interdependencies between Lehnytskyi potentials and stresses and displacements. A new approach to finding the shape of holes is proposed, which is reduced to the consideration of the problem of nonlinear programming. Theoretical foundations of the method of local strengthening of thin-walled structural elements based on the creation of a favorable distribution of plastic deformations near stress concentrators have been developed. To test it, methods for solving boundary-value problems of plasticity theory for plates with holes based on the methods of integral equations, additional deformations, and the theory of flow associated with the Mises fluidity condition have been pre-developed. The integral equations are based on Green-type solutions, under which the boundary conditions at the boundary of the plate are satisfied identically. An algorithm for finding these junctions for practically arbitrary openings, which is obtained using the Mushelishvili method and conformal mapping, is presented. An important component of the method is the calculated method of studying the process of fatigue crack growth in the plates, taking into account the residual stresses created and estimating the residual life of the plate elements of the structures on this basis.

Product Description

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Illyushyn Oleksandr V
Afonina Svitlana A
Didukh Anna S
Koshelyuk Viktor A
Mikulich Olena A
Maksimovich Vladimir M
Maksymovych Olesya V
Pasternak Yaroslav M
Prykhodʹko Oleksiy S
Fedorusʹ Marko Yu
Fedorusʹ Yuriy V
Shvabyuk Vasily I
Shvabʺyuk Volodymyr V