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γ—TiAl層狀結(jié)構(gòu)裂尖應(yīng)力場的有限元分析
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TG146.23 TG111.9

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國家自然科學(xué)基金資助項(xiàng)目(59895153)


Stress Analysis of the Crack Tip in FullyLamellar
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    摘要:

    根據(jù)γ-TiAl層狀晶體（PST晶體）的微觀結(jié)構(gòu)，構(gòu)造了可使用有限元計(jì)算的夾心基元。由有限元計(jì)算表明，當(dāng)裂尖平行于片層時(shí)，裂尖前端所有滑移系上的分切應(yīng)力都很小。即滑移較弱，而沿片層界面（它總是解理面之一）的正應(yīng)力有最大值，這表明，裂尖將沿片層擴(kuò)展，而且塑性小，當(dāng)裂紋垂直于片層時(shí)，裂尖前端很多滑移系上的分切應(yīng)力都很大，最大正應(yīng)力并不在片層界面上，而總在跨片層的解理面上，這表明，裂尖在片層內(nèi)解理，并且塑性很大。

    Abstract:

    A lamellar structural unit model of PST crystal used in finite element analysis has been built on the basis of studying the microstructure of PST crystal. The calculation indicates that as crack is parallel to the lamellae, the resolved shear stresses on all slip planes ahead of crack tip are low, and the slip is difficulty, while the normal stress on lamellar interface is higher than that on other cleavage planes, which results in crack nucleation along lamellar interfaces preferentially and low ductility. As the crack perpendicular to the lamellae, the resolved stress on many slip planes ahead of crack tip is much higher, and the slip is easy. The maximum normal stress on the translamellar cleavage planes rather than the lamellar interface, which results in crack nucleation along translamellar interfaces preferentially and good ductility.

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陸永浩 張永剛 等.γ—TiAl層狀結(jié)構(gòu)裂尖應(yīng)力場的有限元分析[J].稀有金屬材料與工程,2001,(2):109~113.[Lu Yonghao, Zhang Yonggang, Qiao Line, Wang Yanbing, Chu Wuyang. Stress Analysis of the Crack Tip in FullyLamellar[J]. Rare Metal Materials and Engineering,2001,(2):109~113.]
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  • 最后修改日期:1999-12-09
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