Finite-element calculation of the thermocyclic strains in bimetal joints of 12Kh18N10T steel with niobium and a titanium alloy

Autor: A. S. Tron, A. T. Lopata, V. Ya. Svitel'nikov, L. A. Zabashta
Rok vydání: 1991
Předmět:
Zdroj: Strength of Materials. 23:224-230
ISSN: 1573-9325
0039-2316
DOI: 10.1007/bf00770817
Popis: An original variation of the finite element method has been developed. Its main features are that a large step-by-step increment of elastoplastic deformation (up to 10%) is acceptable, the method of calculation of the matrix of rigidity of an element reduces nonhardening and softening materials to ordinary particular cases, and the calculations use a real unsimplified strain diagram of the material. With use of the variation of the finite element method developed the distribution of intensity of plastic deformation accumulated during one thermal cycle in the 200–900°C range was calculated for model specimens of tubular joints machined from 12Kh18N10T steel-titanium alloy and 12Kh18N10T steel-niobium bimetals. It is shown that the calculation results agree well with experimental results and the difference in fracture of the niobium and titanium alloy specimens may be explained by the difference in distribution of strain in the copper layer, which in dimensions, form, and location is the same in the niobium and titanium alloy specimens. Calculation of a single specimen on an ES-1040 computer required comparatively small computer resources, 22 min of central processor time and 250 K of operational memory. Net-works consisting of 156 linear triangular finite elements and having 190 degrees of freedom were used for simulation of the specimens.
Databáze: OpenAIRE
Externí odkaz: