METHOD FOR CHECKING PRE-TIGHTENING FORCE OF DISSIMILAR METAL CONNECTING BOLT IN ULTRA-CRYOGENIC CONDITION ON BASIS OF SIMPLIFIED MODELING

WIPO Patent Application WO/2023/092619

A1

A method for checking a pre-tightening force of a dissimilar metal connecting bolt in an ultra-cryogenic condition on the basis of simplified modeling, comprising: defining structure parameters of a bolt (S1); defining structure parameters of dissimilar metal connected members (S2); defining mechanical parameters and thermophysical parameters of materials of the bolt and the connected members (S3); performing equivalent model modeling and grid division (S4); loading a mechanical boundary condition (S5); loading a thermal boundary condition (S6); defining a contact pair (S7); and obtaining a pre-tightening force value of the bolt in an ultra-cryogenic condition by means of thermo-mechanical coupling simulation calculation, and determining whether corresponding mechanical evaluation indicators are satisfied (S8). According to the solution, thermo-mechanical coupling calculation can be carried out by means of a simplified model with a small amount of calculation, without introducing stress concentration, and calculation convergence is ensured. The solution fills in gaps in methods for checking the pre-tightening force of a dissimilar metal connecting bolt in an ultra-cryogenic working condition, provides an evaluation standard based on breakaway torque and an evaluation standard based on the tangential force and axial force of a bolt, and can be used for determining the reliability of connection of the bolt.

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SHAO QING (CN)
LI KAI (CN)
WANG AIBIN (CN)
HU HAO (CN)

PCT/CN2021/134742

June 01, 2023

December 01, 2021

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CRRC CHANGCHUN RAILWAY VEHICLES CO LTD (CN)

G06F30/23; G06F30/17; G06F111/04

CN108460237A	2018-08-28
CN109299532A	2019-02-01
CN108774673A	2018-11-09
CN103353907A	2013-10-16
CN111444654A	2020-07-24
US20170140091A1	2017-05-18

UNITALEN ATTORNEYS AT LAW (CN)

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