Failure Analysis of Falling⁃off Behavior of Car Front Glass Bracket

doi:10.19491/j.issn.1001-9278.2021.04.004

Abstract

Abstract:

The three car front class brackets， including a failure bracket from Chongqing， Southwest China， a failure bracket from Guangzhou， South China and a normal man-made damaged bracket， were observed and comparatively analyzed using Fourier transform infrared spectrometer， depth-of-field microscope and scanning electron microscope. The effect of isopropanol on the brackets was also investigated. The results indicated that isopropanol had little effect on the brackets. There were different degrees of defects and cracks in the bottom coating part and the degumming part of the two failed brackets， indicating a decrease in the interface binding force of the bonding parts. This directly resulted in the falling off of scaffold. The thickness of the base coat had a great influence on the interface adhesion of the bracket.

Key words: bracket, shedding behavior, isopropanol, bonding strength, primer thickness

CLC Number:

TQ 323.7

SHENG Leihui, MA Yuji, HUANG Ming, LU Bo, LIU Chuntai, ZHANG Na. Failure Analysis of Falling⁃off Behavior of Car Front Glass Bracket[J]. China Plastics, 2021, 35(4): 18-22.

Figures/Tables 6

Fig.1. Treatment steps and bonding sequence of the bracket

Fig.2. Depth?of?field diagram of the surface morphology of the scaffold

Fig.3. Infrared analysis results

Fig.4. Depth?of?field morphology of the body part of the support

Fig.5. Depth?of?field plane morphology of the bottom coating of the shedding support and the colloidal part

Fig. 6. SEM morphology of the colloidal surface of the detached scaffold

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