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基于模糊理論的Ti-22Al-25Nb合金高溫本構關系模型
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國家“973”計劃（2007CB613807）；新世紀優(yōu)秀人才支持計劃（NCET-07-0696）


Modeling the High-Temperature Constitutive Relationship of Ti-22Al-25Nb Alloy Based on Fuzzy Theory
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    摘要:

    運用Gleeble1500熱模擬實驗機對Ti-22Al-25Nb鈦合金試樣進行熱模擬壓縮試驗，針對該合金高溫變形過程時復雜的流變行為，以實驗所得數(shù)據(jù)（變形溫度940~1030 ℃，應變速率0.001~10 s-1）為基礎，從模糊集理論的本質特征出發(fā)，提出了一種基于模糊動態(tài)線性原理的本構模型，并與實驗結果進行了對比。結果表明：基于模糊集理論建立的Ti-22Al-25Nb合金的高溫本構關系模型是切實可行的，擬合程度較高，彌補了傳統(tǒng)回歸模型不能反映變形全過程的局限性，是一種有廣泛應用前景的表征工程材料本構關系的便捷有效的方法。

    Abstract:

    The hot deformation characteristics of Ti-22Al-25Nb alloy were studied in the temperature range of 940-1030 oC and strain rate range of 0.001-10 s-1 using Gleeble 1500 thermal simulator. Based on the results obtained from the experiment for the complex flow deformation behavior, a constitutive model of Ti-22Al-25Nb alloy was established with the help of the fuzzy set theory. Simultaneously, a kind of fuzzy dynamic linear model was put forward to extract the feature of sample data for the complicated nonlinear relationship of thermodynamic parameters. Compared with the experimental value, the results of this study indicate that the method is feasible to construct a constitutive relationship model for this alloy and high in the degree of fitting. It can be used to make up for the limitations that traditional regression can not reflect the whole deformation process. It is not only a wide prospect of application but also a convenient way to characterize the constitutive model for Ti-22Al-25Nb alloy.

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韓遠飛,曾衛(wèi)東,孫 宇,趙永慶,王邵麗,周義剛.基于模糊理論的Ti-22Al-25Nb合金高溫本構關系模型[J].稀有金屬材料與工程,2011,40(2):289~293.[Han Yuanfei, Zeng Weidong, Sun Yu, Zhao Yongqing, Wang Shaoli, Zhou Yigang. Modeling the High-Temperature Constitutive Relationship of Ti-22Al-25Nb Alloy Based on Fuzzy Theory[J]. Rare Metal Materials and Engineering,2011,40(2):289~293.]
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  • 收稿日期:2010-03-01
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