Fatigue performance testing method for fuel cell cantilever support

A technology of fatigue performance testing and cantilever support, which is applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., and can solve the problems of inability to accurately evaluate the fatigue performance of fuel cell cantilever supports

Pending Publication Date: 2022-01-25
BEIJING SINOHYTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention aims to provide a method for testing the fatigue performance of a fuel cell cantilever to solve the problem that the prior art cannot accurately evaluate the fatigue performance of a fuel cell cantilever

Method used

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  • Fatigue performance testing method for fuel cell cantilever support
  • Fatigue performance testing method for fuel cell cantilever support
  • Fatigue performance testing method for fuel cell cantilever support

Examples

Experimental program
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Embodiment 1

[0070] One embodiment of the present invention discloses a method for testing the fatigue performance of a fuel cell cantilever support, such as figure 1 shown, including the following steps:

[0071] S1. Suspend the outer end of the fuel cell cantilever support, apply a downward fixing force, collect the bending strain of the cantilever support, and determine the force corresponding to the unit bending strain;

[0072] S2. Collect the bending strains of the cantilever brackets under different road conditions respectively, and determine the equivalent load corresponding to the comprehensive road conditions according to the bending strains combined with the force corresponding to the above-mentioned unit bending strains;

[0073] S3. Taking the equivalent load corresponding to the comprehensive road condition as the initial load, increasing the equal load every fixed time, and performing a step stress accelerated life test on the cantilever until the cantilever breaks, and tak...

Embodiment 2

[0078] Optimizing on the basis of Example 1, step S1 further obtains the bending strain of the cantilever bracket through the following steps:

[0079] S11. Fix the fuel cell through the installation position;

[0080] S12. After the fixation is completed, suspend the outer end of the fuel cell cantilever support, and arrange two unidirectional strain gauges that are symmetrical up and down on the outer end;

[0081] S13. After the layout is completed, a weight with a fixed mass is applied to the outer end of the fuel cell cantilever support, so that a downward fixed force is generated;

[0082] S14. After the force is applied, collect the strains of the above two unidirectional strain gauges respectively ε 上 , ε 下 ;

[0083] S15. Determine the bending strain of the cantilever bracket by the following formula ε 砝码

[0084] ε 砝码 =( ε 上 - ε 下 ) / twenty one)

[0085] Paste two vertically symmetrical unidirectional strain gauges on the outer end (root) of the cantile...

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Abstract

The invention provides a fatigue performance testing method for a fuel cell cantilever support, belongs to the technical field of fuel cells, and solves the problem that the fatigue performance of the fuel cell cantilever support cannot be accurately evaluated in the prior art. The method comprises the steps: applying downward fixing force to the outer end of the cantilever support, collecting bending strain, and determining force corresponding to unit bending strain; collecting bending strains of the cantilever support under different road conditions, and determining equivalent loads corresponding to the comprehensive road conditions according to the bending strains; taking an equivalent load corresponding to the comprehensive road condition as an initial load, increasing the equivalent load every fixed time, carrying out a step stress accelerated life test on the cantilever support until the cantilever support is broken, and taking the load during breakage as a fatigue equivalent load of the cantilever support; and according to the fatigue equivalent load and the equivalent load corresponding to the comprehensive road condition, obtaining a safety coefficient representing the fatigue performance of the cantilever support. A reference basis can be provided for design and verification of the cantilever support.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for testing the fatigue performance of a fuel cell cantilever bracket. Background technique [0002] Fuel cell is a device that uses the electrochemical reaction of hydrogen and oxygen to obtain electrical energy. It has the advantages of high power generation efficiency, low environmental pollution, high specific energy, and low noise. Good application prospects. [0003] The subsystems and components of the fuel cell system are installed inside the system through brackets. Due to space constraints, some brackets use cantilever structures. If the cantilever length is long, a large bending moment will be generated along the z direction, and the long-term load on the vehicle road Under the action, fatigue fracture occurs. [0004] In the prior art, there is no fatigue performance testing method for the fuel cell cantilever, and the anti-fatigue performance of the can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 李江飞丁铁新方川李飞强
Owner BEIJING SINOHYTEC
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