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Method of using nonlinear finite-element overall-partial-joint modeling for valving fastening bolt coupling stress analysis

A technology for coupling stress and tightening bolts, applied in the field of finite element analysis, can solve problems such as bolts affecting the safe operation of power plants, lack of consideration of complex stress states of bolts, etc., to achieve the effect of ensuring accuracy and improving efficiency

Active Publication Date: 2018-11-06
温州燃机发电有限公司
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Problems solved by technology

[0004] The technical problem to be solved and the technical task proposed by the present invention are to overcome the problem that the existing bolt finite element stress calculation method lacks consideration of the complex stress state of the bolt under actual working conditions, and the fracture of the calculated bolt during use affects the safe operation of the power plant. The invention provides a method for coupling stress analysis of valve fastening bolts by using nonlinear finite element integral-local joint modeling. The stress analysis method fully considers the stress state of the bolt under actual working conditions, and ensures the calculation accuracy At the same time, it greatly improves the computing efficiency, which has very important engineering significance

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  • Method of using nonlinear finite-element overall-partial-joint modeling for valving fastening bolt coupling stress analysis
  • Method of using nonlinear finite-element overall-partial-joint modeling for valving fastening bolt coupling stress analysis
  • Method of using nonlinear finite-element overall-partial-joint modeling for valving fastening bolt coupling stress analysis

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0050] Such as Figure 1-13 As shown in , a method for coupling stress analysis of valve fastening bolts using nonlinear finite element global-local joint modeling includes the following steps:

[0051] (1) First establish the 3D overall geometric model of the valve, such as figure 1 As shown, it is called the parent model here. The 3D geometric model ignores the parts such as the valve stem and the valve disc in the cavity, as well as the auxiliary structures such as the valve stem leakage port and the drain port. Finally, an appropriately simplified model is established in the UG NX8.5 environment. Valve solid model; the simplified solid model is mainly composed of valve cover, valve casing (including elastic legs on both sides) and fastening components (including nuts, collars, bolts);

[0052] In the parent model, temporarily use bare rod...

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Abstract

The invention relates to the field of finite-element analysis, and particularly to a method of using nonlinear finite-element overall-partial-joint modeling for valving fastening bolt coupling stressanalysis. Existing bolt finite-element stress calculation methods lack consideration on complex stress status of bolts under actual working conditions, and the bolts calculated thereby fracture in use, and impact safe running of power plants. According to the method of using nonlinear finite-element overall-partial-joint modeling for valving fastening bolt coupling stress analysis disclosed by theinvention, a method of overall-local-joint modeling is used, and thermo-mechanical coupling, thread tooth geometry details and nonlinear contact friction between cooperation surfaces are considered;a polished-rod model is used in a parent model, the thread tooth details are considered in sub-models for fine modeling, finite-element modeling efficiency is improved, and finite-element analysis accuracy of nonlinear coupling is ensured. According to the stress analysis method of the invention, bolt stress analysis is enabled to be close to the actual working conditions of the bolts, and at thesame time, a finite-element mesh scale and corresponding calculation quantity thereof are reduced.

Description

technical field [0001] The invention relates to the field of finite element analysis, in particular to a method for coupling stress analysis of valve fastening bolts by using nonlinear finite element integral-local joint modeling. The stress analysis method is used for high and medium pressure main valves, Calculation and modeling of bolt fastening stress for high and medium pressure main steam valve body and high, medium and low pressure cylinder block of steam turbine. Background technique [0002] The existing conventional bolt finite element stress calculation method is only for bolt modeling, and the total load of the bolt is simply equal to the sum of the pretightening force and the internal medium stress, lacking the interaction between the bolt and the valve body under different states ( coupling) to generate stress calculations. Advantages of the conventional method: simple and easy to implement. And because the physical and chemical properties of conventional bol...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/17G06F2119/06
Inventor 傅洪军叶笃毅彭勃金敬东张章军陈腊梅许好好徐金雷
Owner 温州燃机发电有限公司
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