| UD-Cf/SiC陶瓷基复合材料的高温拉伸性能 |
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| 引用本文： | 曹英斌,张长瑞,周新贵,陈朝辉.UD-Cf/SiC陶瓷基复合材料的高温拉伸性能[J].复合材料学报,2001,18(3):81-84. |
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| 作者姓名： | 曹英斌 张长瑞 周新贵 陈朝辉 |
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| 作者单位： | 国防科技大学 航天与材料工程学院国防科技重点实验室, 长沙 410073 |
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| 基金项目： | 国防预研重点资助项目(12.1.4.3) |
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| 摘 要： | 采用两种形状(纺锤形、矩形)的拉伸试样对热压单向M40JB-Cf/SiC和T800-Cf/SiC复合材料进行了高温拉伸强度测试,得到了Cf/SiC复合材料的拉伸强度,并对纺锤形试样断裂应变的表达式进行修正,得出了复合材料的弹性模量。M40JB-Cf/SiC复合材料1300℃的拉伸强度及模量分别为374 MPa和134 GPa, 1450 ℃的拉伸强度及模量为338 MPa和116 GPa,T800-Cf/SiC复合材料1300 ℃拉伸强度和模量为392 MPa 和115 GPa。测试结果与试样的断裂方式密切相关,在有效部位断裂的测试结果大于在非有效区断裂的测试结果。M40JB-Cf/SiC复合材料的拉伸断裂应力-应变曲线表现出塑性变形的非线弹性破坏特征,而T800-Cf/SiC主要表现为线弹性特征。
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| 关 键 词： | 陶瓷基复合材料 高温拉伸强度 高温拉伸模量 应力-应变曲线 |
| 文章编号： | 1000-3851(2001)03-0081-04 |
| 收稿时间： | 2000-09-20 |
| 修稿时间： | 2000年9月20日 |
TENSILE PROPERTIES OF UD-Cf/SiC CERAMIC MATRIX COMPOSITES AT ELEVATED TEMPERATURE |
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| CAO Ying-bin,ZHANG Chang-rui,ZHOU Xin-gui,CHEN Zhao-hui.TENSILE PROPERTIES OF UD-Cf/SiC CERAMIC MATRIX COMPOSITES AT ELEVATED TEMPERATURE[J].Acta Materiae Compositae Sinica,2001,18(3):81-84. |
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| Authors: | CAO Ying-bin ZHANG Chang-rui ZHOU Xin-gui CHEN Zhao-hui |
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| Affiliation: | Key Lab of Advanced Ceramic Fiber and Composites, College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | M40JB-Cf/SiC and T800-Cf/SiC composite's elevated temperature tensile strengths were tested with spindle-shaped and rectangular specimens. The tensile strength and tensile modulus were got after modifying the spindle-shaped specimen's strain formula. The elevated temperature tensile results showed that M40JB/SiC composite's tensile strength was 374MPa under 1300℃ and 338MPa under 1450℃, the tensile modulus was 134GPa under 1300℃ and 116GPa under 1450℃. Compared with the M40JB-Cf/SiC composites, the T800-Cf/SiC composites' tensile strength was 392MPa under 1300℃, higher than the M40JB-Cf/SiC composites, while the tensile modulus was 115GPa under 1300℃, lower than M40JB-Cf/SiC composite's. From the elevated temperature tensile test results, it was found that the composite tensile strength was correlative with the specimen's failure mode. When the failure happened at the effective part, the tensile strength values were higher than the values when the failure happened at the ineffective part, which were only 250MPa. The tensile stress-strain curves of M40JB-Cf/SiC composites showed non-linear-elastic fracture characters clearly of plastic materials, but the tensile stress-strain curves of T800-Cf/SiC composites were the linear curves. |
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| Keywords: | ceramic matrix composites elevated temperature tensile strength tensile modulus stress strain curves |
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