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Study on the Fatigue Performance of Adhesive-bonded AZ31 Magnesium Alloy Joint

Author: LiuAiLong
Tutor: WangMingXing
School: Zhengzhou University
Course: Materials Physics and Chemistry
Keywords: AZ31 magnesium alloy Bonding Surface treatment Environmental exposure Fatigue crack growth
CLC: TG491
Type: Master's thesis
Year: 2010
Downloads: 80
Quote: 0
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Abstract


With the development of the automobile lightweight magnesium alloy in the car began to increase. Due to the high chemical activity of the magnesium alloy, the welding techniques in general is difficult for the connection of the magnesium alloy, and adhesive bonding techniques may become connected to the magnesium alloy, a method of choice. U.S. General Joint Fund \The main contents of the study include the following aspects: 1. Magnesium alloy substrate surface treatment method on the fatigue properties of bonded joints. The results show that: cleaning and polishing processing and cleaning plus phosphorus film processing can increase the shear properties of AZ31 magnesium alloy bonded joints; cleaning and phosphorus film processing magnesium alloy bonded joints fatigue performance is better than cleaning and sanding process and cleaning process adhesive joints, but in a low stress level, the cleaning and sanding treatment magnesium alloy bonding joint fatigue performance is less than only to do a cleaning treatment adhesive joints. Therefore, the shear properties of magnesium alloy bonded joints and can not fully reflect the dynamic loads, fatigue performance is good or bad. Before the adhesive curing, hot and humid environment exposed to shear and fatigue properties of magnesium alloy bonded joints. The results show that, compared with the bonded joints without environmental exposure, seven hours before curing environmental exposures were not significantly affected the shear strength and fatigue performance of bonded joints. The comparative study of adhesive curing environment exposed to the cleaning and polishing handling and cleaning plus phosphorus film processing shear and fatigue performance of bonded joints. After 10 days of environmental exposure, shear and fatigue performance of bonded joints were significantly reduced, but still higher than the cleaning and polishing processing bonded joints; cleaning plus phosphorus film treatment fatigue properties of bonded joints in load level lower environmental exposure cleaning, plus the phosphorus membrane treatment fatigue life of the bonded joints longer than cleansing polished handle the same load level without environmental exposure bonded joints. Thus, the adhesive joint fatigue performance of the magnesium alloy is not only dependent on the static shear properties, but also by the influence of the structure and properties of the adhesive surface of the substrate. 4 fatigue crack growth behavior of aluminum alloy bonded joints using three-point bend specimens polished and silicic acid sodium phosphate oxidation system. The results show that: the fatigue crack propagation behavior of the three-point bend specimens bonded joints is feasible; polished treated aluminum oxide and silicate, sodium phosphate bonded joints have similar fatigue crack growth behavior. 5 before curing of the adhesive, after a hot and humid environment exposed to fatigue crack propagation behavior of bonded joints. The research results show that environmental exposure after curing the adhesive joint resistance to crack propagation ability substantially reduced, and cured prior to environmental exposure of the adhesive joint anti-fatigue crack growth.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Bonding, the bonding > Bonding theory
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