针刺C/C复合材料高温力学性能试验及本构关系（英文）
|
摘要
为研究针刺C/C复合材料高温下力学性能,通过C/C材料试件不同温度下的拉伸、压缩及剪切性能试验,观察试件在高温和外载荷作用下的破坏模式,获得了材料不同温度下的应力-应变曲线。基于对Jones-Nelson-Morgan模型改进并引入温度系数,建立了C/C复合材料高温本构关系模型,并与试验结果进行了对比。结果表明,在温度≤1800℃,针刺C/C材料为线弹性本构关系,C/C材料拉伸、压缩及剪切强度均随温度的升高呈先升高、后降低趋势,在温度≥1600℃后,强度逐渐降低;建立的高温本构模型计算结果与试验结果吻合较好; C/C材料整体表现为脆性破坏,拉伸破坏纤维拔出尺寸较短,压缩破坏断口呈现45°豁口。
In order to study the high-temperature mechanical properties of needle-punched C/C composite,the tests of tensile,compress and shear at different temperatures on C/C composites have been conducted.The failure modes of C/C samples under hightemperature and external loads have been observed,and the stress-strain curves at different temperature are also obtained.Based on the improvement of Jones-Nelson-Morgan model and the introduction of temperature coefficient,a C/C constitutive relation model was established and compared with the testing results.The results show that,at the temperature less than 1800 ℃,the needlepunched C/C material follows a linear elastic constitutive relation,and the tensile,compressive and shear strengths increase first and then decrease with increase of the temperature.The strength decreases gradually when the temperature is above 1600 ℃.The calculated results from a constitutive model are in good agreement with the experimental results.The overall performance of C/C materials is of brittle failure,and the pull-out size of tensile failure fiber is short,whereas the compression fracture presents a 45°notch.
In order to study the high-temperature mechanical properties of needle-punched C/C composite,the tests of tensile,compress and shear at different temperatures on C/C composites have been conducted.The failure modes of C/C samples under hightemperature and external loads have been observed,and the stress-strain curves at different temperature are also obtained.Based on the improvement of Jones-Nelson-Morgan model and the introduction of temperature coefficient,a C/C constitutive relation model was established and compared with the testing results.The results show that,at the temperature less than 1800 ℃,the needlepunched C/C material follows a linear elastic constitutive relation,and the tensile,compressive and shear strengths increase first and then decrease with increase of the temperature.The strength decreases gradually when the temperature is above 1600 ℃.The calculated results from a constitutive model are in good agreement with the experimental results.The overall performance of C/C materials is of brittle failure,and the pull-out size of tensile failure fiber is short,whereas the compression fracture presents a 45°notch.
引文
[1]Ken Goto,Hiroshi Hatta.Tensile strength and deformation of a two-dimensional carbon-carbon composite at elevated temperatures[J].Journal of the American Ceramic Society,2003,12(86):2129-2135.
[2]Karpov A P,Mostovoy G E.High-temperature mechanical properties of carbon and composite carbon-carbon materials[J].Inorganic Materials:Applied Research,2015,5(6):454-460.
[3]YI Fajun,HAN Jiecai,DU Shanyi.Experimental investigation on mechannical properties of hybrid carbon-carbon composites at ultra-high temperature[J].Acta Materiae Compositae sinica,2003,20(2):118-122.
[4]WU Baohua,LIU Chunli,ZHANG Tao,et al.Research on mechanical properties test of C/C composites at ultra high temperature[J].Aerospace Materials&Technology,2001,(6):67-71,76.
[5]LI Diansen,LUO Gan,YAO Qianqian,et al.High temperature compression properties and failure mechanism of 3Dneedle-punched carbon/carbon composites[J].Materials Science&Engineering A,2015:105-110.
[6]CHEN Zhen,FANG Guodong,XIE Junbo,et al.Experimental study of high-temperature tensile mechanical properties of 3D needle C/C-SiC composites[J].Materials Science&Engineering A,2016:271-277.
[7]GOU Jianjie,ZHANG Chengyu,WU Xiaojun,QIAO Shengru.Shear properties of integral felt C/C composites at elevated temperatures[J].Materials Review,2013,(27)14:74-77.
[8]HAN Hongmei,LI Hejun,Li Kezhi,ZHANG Xiulian.Effect of high temperature on mechanical behavior of 3Dbraided C/C composites[J].Journal of Northwestern Polytechnical University,2003,21(3):352-355.
[9]Jones R M,Nelson D A R.Further characteristics of a nonlinear material model for ATH-S graphite[J].J.Composite Materials,1975(9):251-265.
[10]CHEN Zhengfa,QIN Yanlong.Experimental study on constitutive relation of concrete with manufactured-sand after high temperatures[J].Concrete,2013(12):72-86.
[2]Karpov A P,Mostovoy G E.High-temperature mechanical properties of carbon and composite carbon-carbon materials[J].Inorganic Materials:Applied Research,2015,5(6):454-460.
[3]YI Fajun,HAN Jiecai,DU Shanyi.Experimental investigation on mechannical properties of hybrid carbon-carbon composites at ultra-high temperature[J].Acta Materiae Compositae sinica,2003,20(2):118-122.
[4]WU Baohua,LIU Chunli,ZHANG Tao,et al.Research on mechanical properties test of C/C composites at ultra high temperature[J].Aerospace Materials&Technology,2001,(6):67-71,76.
[5]LI Diansen,LUO Gan,YAO Qianqian,et al.High temperature compression properties and failure mechanism of 3Dneedle-punched carbon/carbon composites[J].Materials Science&Engineering A,2015:105-110.
[6]CHEN Zhen,FANG Guodong,XIE Junbo,et al.Experimental study of high-temperature tensile mechanical properties of 3D needle C/C-SiC composites[J].Materials Science&Engineering A,2016:271-277.
[7]GOU Jianjie,ZHANG Chengyu,WU Xiaojun,QIAO Shengru.Shear properties of integral felt C/C composites at elevated temperatures[J].Materials Review,2013,(27)14:74-77.
[8]HAN Hongmei,LI Hejun,Li Kezhi,ZHANG Xiulian.Effect of high temperature on mechanical behavior of 3Dbraided C/C composites[J].Journal of Northwestern Polytechnical University,2003,21(3):352-355.
[9]Jones R M,Nelson D A R.Further characteristics of a nonlinear material model for ATH-S graphite[J].J.Composite Materials,1975(9):251-265.
[10]CHEN Zhengfa,QIN Yanlong.Experimental study on constitutive relation of concrete with manufactured-sand after high temperatures[J].Concrete,2013(12):72-86.