Special receptions of the analysis shell formchanging
The experimental research techniques of gas forming require considerable production expenditures. It does not allow to obtain all indispensable formchanging parameters of material. On the basis of data on stress-strain state of a blank the application of mathematical simulation allows to select the process meeting certain requirements without laborious and expensive experiments. It is especially important, when superplasticity effect is taken into account during manufacturing workpieces from titanium alloys used in an aerospace industry, civil and naval aviation. The software of 3-dimensional simulation requires considerable time for data preparation and calculations, including appropriate computer facilities. Therefore, the development of mathematical simulation technique of sheets formchanging according to their critical section is actual. This technique of 3-dimensional simulation and rate of twodimensional simulation involves advantage. In this paper, we introduce a new technique of evaluating for 3-dimensional shells based on the cross-sections method. The formulation of mathematical simulation of technological conditions to form 3-dimensional shells in superplasticity controlled modes is reviewed. The stress-strain state is evaluated applying finite element method. The technique allows, not solving the volumetric task, to obtain the express values main technological parameters of sheet gas forming and to calculate the geometrical characteristics of final workpieces. Allowing maximal extracts, is selected main (from a plane xy) and auxiliary (in a plane yz) section in the sheet. The main section is selected with allowance for critical states of the forming sheet, from places of its possible rupture. The auxiliary section is posed perpendicularly to main section. The stress-strain state of auxiliary cut settles up. On a tension of auxiliary section the values of deformations zz ε are evaluated. The computed values will be used for calculation of main section. The veracity of the solution obtained is analyzed. The experimental researches are realized and the estimation of correlation of the idealized forecasts with the experimental data is constructed. The obtained results and designed algorithms allow essentially to increase performance and operationability at mining new and retrofit of existing manufacturing processes of gaseous forming in conditions of superplasticity.
Irina V.Logashina Eugene N.Chumachenko
Moscow State Institute of Electronics and Mathematics (Technical University),109028, Russia, Moscow, Moscow State Institute of Electronics and Mathematics (Technical University), 109028, Russia, Moscow
国际会议
桂林
英文
1-6
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）