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SiC顆粒增強(qiáng)鋁基復(fù)合材料的熱循環(huán)行為研究
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中國航空基礎(chǔ)科學(xué)基金 (03H53048)資助


Thermal Cycling Behavior of Aluminum Matrix Composites
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    摘要:

    基于材料微觀組織建立了視場胞元模型,并采用商用有限元軟件ABAQUS對胞元模型進(jìn)行溫度循環(huán)的數(shù)值模擬,著重分析熱循環(huán)中基體和增強(qiáng)顆粒的等效應(yīng)力分布規(guī)律,及主應(yīng)力σ11和σ22的分布規(guī)律。結(jié)果表明:在熱循環(huán)的升溫階段,基體的主熱應(yīng)力整體表現(xiàn)為壓應(yīng)力,增強(qiáng)顆粒表現(xiàn)為拉應(yīng)力;在降溫階段,基體表現(xiàn)為拉應(yīng)力,增強(qiáng)顆粒表現(xiàn)為壓應(yīng)力;在模擬中,對3次循環(huán)中的主熱應(yīng)力σ22做了統(tǒng)計,發(fā)現(xiàn)不論是基體還是增強(qiáng)顆粒,從第2次循環(huán)開始,熱應(yīng)力就開始趨于穩(wěn)定。通過改變單元胞中顆粒的體積分?jǐn)?shù)進(jìn)一步分析體積分?jǐn)?shù)變化對顆粒增強(qiáng)金屬基復(fù)合材料熱循環(huán)的影響,結(jié)果發(fā)現(xiàn)體積分?jǐn)?shù)減小之后,基體和增強(qiáng)顆粒應(yīng)力分布變得均勻,并且各次循環(huán)中的熱應(yīng)力相差不大,比較穩(wěn)定。最后對熱循環(huán)中的應(yīng)變滯后回線進(jìn)行了分析,表明高體積分?jǐn)?shù)下的復(fù)合材料具有高的熱穩(wěn)定性

    Abstract:

    A finite element modeling based on the actual microstructure is established to analyse the thermal cycling behavior of metal Al matrix composites (MMC). The distribution of Von Mises effective stress and principle stress is presented, and the results show that during the heating, the thermal stress is negative in matrix, but positive in particles; during the cooling, the thermal stress is positive in matrix, but negative in particles. Simultaneously, the principle stress s22 after three thermal cycles is calculated to be steady after the two cycles. The effect of volume fraction on the thermal cycles is analysed in the cell model, finding that the distribution of von Mises stress is more uniform than the previous model. Through comparison, it is shown that the composites with high volume particle fraction possess a higher dimensional stability

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張 鵬,李付國. SiC顆粒增強(qiáng)鋁基復(fù)合材料的熱循環(huán)行為研究[J].稀有金屬材料與工程,2009,38(11):1929~1934.[Zhang Peng, Li Fuguo. Thermal Cycling Behavior of Aluminum Matrix Composites[J]. Rare Metal Materials and Engineering,2009,38(11):1929~1934.]
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  • 收稿日期:2009-01-08
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