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Method for acquiring fatigue performance benchmark data of bolt under industrial pollution environment

A technology that pollutes the environment and fatigue performance. It is used in measuring devices, instruments, scientific instruments, etc. It can solve problems such as failure to reflect the fatigue performance of bolts, and achieve the effect of reducing the risk of equipment failure, high reliability and low cost.

Active Publication Date: 2017-05-17
CHINA AERO POLYTECH ESTAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The article "Study on the Fatigue Life of Pre-corroded Aluminum Alloy Typical Bolted Single Lap Joints" published by the Qingdao Branch of the Naval Aeronautical Engineering Institute in 2012 takes the bolted structural parts as the test and assessment object. The purpose is to improve the design and protection methods of the connected structure. Reflects the fatigue performance of the bolt itself

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  • Method for acquiring fatigue performance benchmark data of bolt under industrial pollution environment
  • Method for acquiring fatigue performance benchmark data of bolt under industrial pollution environment
  • Method for acquiring fatigue performance benchmark data of bolt under industrial pollution environment

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specific Embodiment

[0056] The materials used in the test are alloy steel bolts, and the specific materials and surface treatment methods are shown in Table 1. All samples were washed with acetone to remove oil, dehydrated with alcohol, dried and placed in a desiccator before the test.

[0057] Table 1 The material and surface treatment of the test sample

[0058] Numbering Product reference standard Material surface treatment Bolt A HB7410-10×50 ML30CrMnSiA Cadmium plating, passivation Bolt B HB7411-10×50 1Cr17Ni2 passivation Nut C HB8232MJ10×1.25CdD 30CrMnSiA Cadmium plating, passivation sandwich material HB7226 LY12 aluminum alloy Anodized, dichromated seal

[0059] Refer to the standard GB 6464-1997 "General Requirements for Field Tests of Atmospheric Corrosion Tests on Metals and Their Covering Layers" to conduct natural environment exposure tests at Chongqing Jiangjin Test Station. air environment data. The simulated environm...

Embodiment 1

[0061] For the alloy steel bolt A, the fatigue performance test was carried out under the shielding environment of industrial pollution, and the fatigue performance index, that is, the fatigue benchmark data, was obtained. The specific implementation steps are:

[0062] 1. Preparation of alloy steel bolt A assembly sample: install alloy steel bolt A and nut C on the aluminum alloy interlayer according to the installation requirements stipulated in HB 7454-1997, HB7595-2011 and HB / Z 223.2-2003, and assemble the nut The torque is 52N·m. Every 6 pairs of bolts 101 and nuts form a group and are assembled on the same interlayer 102 (such as image 3 shown). The interlayer material is 30mm thick LY12 aluminum alloy plate. After machining, it adopts sulfuric acid anodic oxidation process for surface treatment, and then conducts dichromate sealing treatment. The reference standard is HB / Z 233-1993, and the thickness of anodized film is 7-10μm .

[0063] 2. Simulated corrosion test...

Embodiment 2

[0072] The fatigue performance test of the alloy steel bolt A in the open environment of industrial pollution is carried out to obtain the fatigue performance index. The specific implementation steps are:

[0073] 1. Preparation of alloy steel bolt A assembly sample: install alloy steel bolt A and alloy steel nuts of corresponding specifications on the aluminum alloy interlayer according to the installation requirements stipulated in HB7454-1997, HB 7595-2011 and HB / Z 223.2-2003 , The assembly torque of the nut is 52N·m. Every 6 pairs of bolts 101 and nuts form a group and are assembled on the same interlayer 102 (such as image 3 shown). The interlayer material is 30mm thick LY12 aluminum alloy plate, which is surface treated by sulfuric acid anodizing process after machining.

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Abstract

The invention provides a method for acquiring fatigue performance benchmark data of a bolt under an industrial pollution environment. The method comprises the following steps of: S1, assembling a bolt to be tested, namely assembling the bolt with a nut of a corresponding specification according to a relevant standard, and then mounting the bolt and the nut on a metal interlayer to obtain a bolt assembled simulation sample; S2, performing a simulation test in the industrial pollution environment, namely exposing the bolt assembled simulation sample in the industrial pollution environment, and performing an accelerated corrosion test; and S3, testing the fatigue performance of the bolt, namely testing the fatigue performance of the bolt after the test so as to obtain fatigue performance indexes of the bolt in a simulated industrial pollution environment. According to the method provided by the invention, assembly operation, assembly load, and assembly structure factors of the bolt in actual use, and the influence of the industrial pollution environment on the fatigue performance of the bolt are taken into comprehensive consideration, and the fatigue performance of the assembled bolt under the synergistic action of the environment and the load is effectively evaluated.

Description

technical field [0001] The invention belongs to the field of performance evaluation of standard parts, and in particular relates to a method for acquiring benchmark data of fatigue performance of bolts in an industrially polluted environment. Background technique [0002] Bolt is a fastening standard part with large usage, wide range of applications and high versatility. It is widely used in important fields such as aviation, aerospace and ships. Due to the high reliability requirements and the harsh environment of use, the standard parts must undergo strict performance assessment before use. Due to the dual effects of environment and load, bolts need to carry out a large number of corrosion fatigue performance tests before use. Therefore, the fatigue performance test evaluation method that effectively combines factors such as assembly load, assembly structure, assembly operation, and environmental corrosion of bolts in use belongs to the category of standard component perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/006
Inventor 李刚李明程丛高徐良刘静朱金阳陈宇
Owner CHINA AERO POLYTECH ESTAB