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Bonding structure aging prediction method based on chemical characteristic analysis

A technology of chemical properties and bonding structure, applied in the direction of analyzing materials, measuring devices, instruments, etc., to achieve the effect of excellent implementability

Inactive Publication Date: 2019-11-12
JILIN UNIV
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  • Application Information

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Problems solved by technology

[0008] However, there are many domestic and foreign studies on the qualitative analysis of the aging behavior of adhesives in hot and humid environments through chemical properties, but there are few related studies on the establishment of the corresponding relationship between chemical property changes and mechanical property changes through quantitative analysis of chemical property changes.
In addition, due to the particularity of the aging problem, the research on the aging problem can only be carried out by the artificial accelerated test method, how to use the bonded joint or partial structure for accelerated aging research, the equivalent relationship between the joint or partial structure and the overall structure of the real vehicle, and The equivalent relationship between the conclusions of accelerated aging research and the natural aging of real vehicles is currently a problem that is difficult to solve

Method used

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  • Bonding structure aging prediction method based on chemical characteristic analysis
  • Bonding structure aging prediction method based on chemical characteristic analysis
  • Bonding structure aging prediction method based on chemical characteristic analysis

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experiment example

[0106] Experimental example: First, the chemical change data H i The basic transformation of scale translation can obtain a function family with a and b as parameters:

[0107] h i '=H i +at+b

[0108] a-scale factor; b-translation factor;

[0109] The discrete points of the experimental data of mechanical properties and chemical properties are selected every 10 days of aging cycle, and the residual squares of the discrete data of chemical laws and discrete data of mechanical properties are calculated on the same abscissa, and the sum of the residual squares is expressed as a function of the above three parameters , the optimal coincidence state of the discrete data is expressed as the extreme value condition of the function, the sum of the squares of the residual error of the experimental data of mechanical properties and chemical properties and the sum of the squares of the discrete points of the mechanical properties data is the minimum value of the function. Define the...

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Abstract

The invention discloses a bonding structure aging prediction method based on chemical characteristic analysis. The method comprises the steps of S1, producing test pieces; S2, placing the test piecesinto a humid and warm environment box, and carrying out humid and warm cycle according to different temperature or humidity change periods; S3, taking out the test pieces for data testing every otherz periods; and S4, computing approximate correlation of discrete data related to chemical characteristics and mechanical property discrete data in a digital fitting mode, obtaining two groups of correlation degree indexes through combination of a change rule of aging coefficients along with time and the change rule of groups along with the time, and obtaining a mechanical property prediction result.

Description

technical field [0001] The invention relates to the field of mechanical performance prediction, in particular to a method for predicting the aging of bonding structures based on chemical characteristic analysis. Background technique [0002] The artificial accelerated aging test is a laboratory test in which the specimen is exposed to artificially generated natural climate components. Through the accelerated aging test, the chemical properties of the adhesive before and after aging are tested, the moisture-heat aging mechanism of the polymer material is analyzed, and the corresponding relationship between the change of chemical properties and the change of mechanical properties is established, which is the group, molecular weight, glass transition temperature T g The corresponding relationship between failure strength, stiffness, etc. is of great significance for the prediction of hygrothermal aging of bonded structures. [0003] At present, scholars at home and abroad have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04
CPCG01N19/04
Inventor 那景新王广彬慕文龙谭伟申浩高原栾建泽冯耀
Owner JILIN UNIV
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