CREEP BEHAVIOR OF CARBON FIBER COMPOSITES

碳纤维复合材料的蠕变行为

• 批准号: 04452275
• 负责人: OIKAWA Hiroshi
• 金额: $ 4.29万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452275/
• 关键词: C; C COMPOSITE; FOUR POINT BENDING; CREEP STRENGTH; CREEP; PLASTIC FLOW; HIGH TEMPERATURE STRENGTH; LONG-TERM STRENGTH; Cコンポジット; 曲げ試験; 高温変形; 複合材料; クラリープ; 軽量材料; 炭素繊維

High temperature bending and high temperature creep tests of eight layr C/C composites have been investigated and following results have been obtained.(i) C/C composites creep at 1573K.The creep behavior is classified into logarithmic creep.(ii) Slope of displacement-log (time) diagram depends on the applied load and increases as increasing load.(iii) No obvious temperature dependence of yield stress has been observed at 1373-1573K.(iv) C/C composites fracture at lower loads than UTS of fibers.(v) Flow of the matrix strongly affects the yield strength and creep strength of C/C composites.These results strongly suggest that strengthening of the matrix is important to improve long-term high-temperature strength.As conclusions, it is suggested that prediction of long-term deformation characteristics of C/C composite be not possible based on the short-term deformation characteristics. Information of long-term high-temperature deformation characteristics of C/C composites is still lacking and further experimental investigation concerns with effects of deformation conditions are required to improve long-term strength.

本文对八层C/C复合材料进行了高温弯曲和高温蠕变试验研究，得到了以下结果：(i)C/C复合材料在1573 K蠕变，蠕变行为属于对数蠕变。(ii)位移-log（时间）图的斜率取决于所施加的载荷，并随着载荷的增加而增加。(iii)在1373- 1573 K范围内，没有观察到明显的屈服应力温度依赖性。(iv)C/C复合材料的断裂载荷低于纤维的UTS。(v)基体的流动对C/C复合材料的屈服强度和蠕变强度有很大的影响，这些结果表明基体的强化对提高C/C复合材料的长期高温强度有重要作用，因此不能根据短期的变形特性来预测C/C复合材料的长期变形特性。C/C复合材料的长期高温变形特性的信息仍然缺乏，需要进一步的实验研究与变形条件的影响，以提高长期强度的关注。