Keyword: «finite element method»

Finite element method is a modern standard tool for determining the stress-strain state of structural engi-neering. The traditional course of strength of materials is focused on «manual» methods of calculation of an age exceeding 100 years. The article is devoted to the integration of finite element analysis in the course of strength of materials in the form of tasks, solved by the students on practical lessons.

In relation to the TPC for handling irradiated fuel assemblies of the BREST-OD-300 reactor plant, the results of calculations by the finite element method on the choice of the design of the striker (throwing body), providing an impact equivalent to the impact of the Phantom RF-4E fighter-bomber, are presented. The parameters of the shock pulse were evaluated on models of various scales. Tests simulating the impact of a striker at a speed of 215 m/sec on the body of a TPC, on targets with a thickness of 25, 15 and 7.5 mm, were carried out using an 80 mm pneumatic cannon. It is shown that the thickness of the walls of the TPC hull ensures the integrity of the structure when the engine of the Phantom RF-4E fighter-bomber strikes.

Determination of impact strength during mechanical impact bending tests is the main practical method for assessing the susceptibility of steel to brittle fracture (GOST 9454-78). The article points out the disadvantages of this test method. Based on finite element modeling, the loading of specimens under impact bending with different types (shapes) of stress concentrator made of structural steel grade St3 was carried out. As a result of the research, a picture of the stress-strain state in the area of stress concentrators was obtained and the edge effect of stress-strain state was shown.

Based on the analysis of the stress-strain state of welded joints, it is shown that when welding saddle branches to existing gas pipelines at low temperatures using the proposed technology and standard welding, the differences in the values of stresses and displacements occurring are insignificant. Numerical calculations have shown that when welding a saddle branch at low temperatures using the proposed technology, it can be expected that the joint strength will not be lower than when welding under standard conditions.