Research on Geometry Model and Stress State Leading-In through Heavy Rail Cooling to Compound Straightening

Abstract

The hot preflex cooling and compound straightening are the last two consecutive deformation processes and determine the straightness, residual stress and cross-sectional size for fabricating hundred-meter heavy rail products. The compound straightening process needs to be adjusted by the preflex cooling status. For studying the straightness, residual stress and cross-sectional size of heavy rail products, the preflex cooling model (including the residual stress) of heavy rail after cooling should be taken as straightening model for studying the compound straightening. In this paper, the results by ANSYS implicit analysis (geometry model and stress state of the cold heavy rail) is fully imported to the compound straightening by ANSYS/LS-DYNA explicit analysis through an implicit-explicit conversion method, which resolved the connection problem of coupling and analysis models for solving complex models in multi-physical fields. It is very significant for solving the similar problems in engineering.

Supported Cobalt Nanoparticles for Hydroformylation Reactions

“…Hence, there is ag rowingi nterest to develop more economic technologies, which allow for quantitativec atalyst recycling. [6] In this respect, many research groups investigated both heterogeneous and immobilised homogeneous catalysts for the title reaction, mainly using rhodium, [7][8][9][10][11][12][13][14] but also cobalt systems [15][16][17] as well as otherm etals. [18][19][20][21][22][23] The main problem of all these catalysts is the leachingo fa ctive metal speciesf rom the support in the presence of CO.…”