单晶高温合金用SiO_2基型芯力学性能及本构模型
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摘要
对定向凝固单晶高温合金空心叶片用SiO_2基陶瓷型芯的力学行为进行了研究,得到了烧结样品S0和热处理样品S1、S2和S3的强度、弹性模量、应力-应变关系等实验结果。基于Weibull分布统计使用M-C (Mohr-Coulomb)判据结合实验结果,建立了符合定向凝固高温合金空心单晶叶片用SiO_2基陶瓷型芯的连续损伤本构模型,并给出了确定相关参数的方法。结果表明,经过1500℃高温热处理的SiO_2基陶瓷型芯样品力学性能、烧结程度均有所提高。使用损伤量D结合连续损伤本构模型公式和微观裂纹形貌,阐述了SiO_2基陶瓷型芯裂纹扩展与宏观断裂的演变关系。
The mechanical behaviors of silica-based cores for the directional solidification of single crystal superalloy hollow blades were investigated.The experimental results of strength,elastic modulus and stress-strain relationship of sintered samples S0 and heat treatment samples S1,S2 and S3 were obtained.Based on the Weibull distribution statistics,the continuous damage constitutive model of silica-based cores for the directional solidification of single crystal superalloy hollow blades was established by M-C(Mohr-Coulomb)criterion.The method of determining the relevant parameters of the continuous damage constitutive model was given.The results show that the mechanical properties and the degrees-of-sinter of silica-based core samples with heat treatment at 1500°C are improved.The relationship between the crack propagation and the macroscopic fracture of silica-based cores is described by the damage variable D in the constitutive model and microstructure.
The mechanical behaviors of silica-based cores for the directional solidification of single crystal superalloy hollow blades were investigated.The experimental results of strength,elastic modulus and stress-strain relationship of sintered samples S0 and heat treatment samples S1,S2 and S3 were obtained.Based on the Weibull distribution statistics,the continuous damage constitutive model of silica-based cores for the directional solidification of single crystal superalloy hollow blades was established by M-C(Mohr-Coulomb)criterion.The method of determining the relevant parameters of the continuous damage constitutive model was given.The results show that the mechanical properties and the degrees-of-sinter of silica-based core samples with heat treatment at 1500°C are improved.The relationship between the crack propagation and the macroscopic fracture of silica-based cores is described by the damage variable D in the constitutive model and microstructure.
引文
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[3] Yang L, Li J R. Rare Metal Materials and Engineering[J],2015,44(6):1363
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[5] Zhang S M, Yu J G, Huang Z Y et al. Rare Metal Materials and Engineering[J], 2016,45(5):1147
[6] Kang Haifeng(康海峰),Li Fei(李飞),Zhao Yanjie(赵彦杰)et al. Journal of Materials Engineering(材料工程)[J],2013(8):85
[7] Berkache A, Dizene R. Heat and Mass Transfer[J], 2017,53(12):3443
[8] Kim E H, Cho G H, Yoo Y et al. Ceramics International[J],2013, 39(8):9041
[9] Wang L Y, Hon M H. Journal of the Ceramic Society of Japan[J], 1994, 102(6):517
[10] Chao C H, Lu H Y. Journal of the American Ceramic Society[J], 2002, 85(4):773
[11] Breneman R C, Halloran J W. Journal of the American Ceramic Society[J], 2015, 98(5):1611
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[13] Kazemi A, Faghihi-Sani M A, Nayyeri M J et al. Ceramics International[J], 2014, 40(1):1093
[14] Kang Haifeng(康海峰),Li Fei(李飞),Zhao Yanjie(赵彦杰)et al. Journal of Aeronautical Materials(航空材料学报)[J],2013, 33(4):1
[15] Xu Ziye(徐子烨),Xuan Weidong(玄伟东),Zhang Jinyao(张金垚)et al. Journal of Shanghai University,Natural Science Edition(上海大学学报,自然科学版)[J],2015, 21(1):28
[16] Zhang H,Xu Q Y,Liu B C, Materials[J],2014, 7(3):1625
[17] Wu M X, Yang Y, Yang G et al. Ceramics International[J],2017,43(11):8075
[18] Guo W, Wang L, Zhu Y et al. Ceramics International[J],2015,41(5):7021
[19] Grady D, Kipp M. Fracture Mechanics of Rock[J], 1987, 10:429
[20] Leckie F A. European Journal of Mechanics-A/Solids[J],1998, 17(6):1046
[21] Weibull W. Journal of Applied Mechanics-Transactions of the Asme[J], 1951, 18(3):293
[22] Keats J B, Lawrence F P, Wang F K. Journal of Quality Technology[J], 1997, 29(1):105
[23] Tang C A. International Journal of Rock Mechanics and Mining Sciences[J], 1997, 34(2):249
[24] Zhao J. International Journal of Rock Mechanics and Mining Sciences[J], 2000, 37(7):1115
[25] Bai Y L, Wierzbicki T. International Journal of Fracture[J],2010, 161:1
[26] Friedman B. American Journal of Physics[J], 1957, 25(3):77