CAJ | 학술논문

为研究2D平纹编织C/SiC复合材料的疲劳性能, 采用Instron8801液压伺服疲劳试验机对2D平纹编织C/SiC复合材料试样进行等幅单向拉-拉疲劳试验.实验中, 采用声发射设备和红外热象仪来动态监测损伤的演化过程; 实验结束后, 采用扫描电子显微镜对拉伸试验和疲劳试验的试样断口的微观形貌进行对比分析. 试验发现, 在前100次循环中, 试件的模量快速下降, 声发射累积能量迅速增大, 温度明显上升. 100个循环后, 试件的模量、声发射累积能量和试件的温度变化趋势变缓. 疲劳和拉伸试样的损伤均以纤维束的断裂、拔出和分层损伤为主; 失效的拉伸试样断口处的纤维被完整的基体外壳包裹着, 而失效的疲劳试样断口处的纤维基本无完整的基体外壳, 表面只有少量的磨损后的基体碎屑.
위연구2D평문편직C/SiC복합재료적피로성능, 채용Instron8801액압사복피로시험궤대2D평문편직C/SiC복합재료시양진행등폭단향랍-랍피로시험.실험중, 채용성발사설비화홍외열상의래동태감측손상적연화과정; 실험결속후, 채용소묘전자현미경대랍신시험화피로시험적시양단구적미관형모진행대비분석. 시험발현, 재전100차순배중, 시건적모량쾌속하강, 성발사루적능량신속증대, 온도명현상승. 100개순배후, 시건적모량、 성발사루적능량화시건적온도변화추세변완. 피로화랍신시양적손상균이섬유속적단렬、발출화분층손상위주; 실효적랍신시양단구처적섬유피완정적기체외각포과착, 이실효적피로시양단구처적섬유기본무완정적기체외각, 표면지유소량적마손후적기체쇄설.
To study fatigue property of 2D plain weave C/SiC composite material, the constant amplitude tension-tension fatigue experiments under room temperature is taken. In the experiment, the infrared thermographer and the acoustic emission equipment are used to inspect damage evolvement of the composites. After the experiment, the scanning electron microscope (SEM) is used to investigate the micrograms of specimens. The results of the experiment show that: (1) In the first 100 cycles, the model of the specimen rapidly decreases, the energy of acoustic emission rapidly increases, and the temperature of specimen obviously increases. (2) After 100 cycles, there is a drop-off in the variation ratio of the model of the specimen, the energy of acoustic emission, and the temperature of specimen. (3) In the tensile test piece and the fatigue testing specimen, the predominant damage models are fiber breakage,fiber pulling out, and delamination. (4) The fibers that are pulled out in the damaged tensile test piece are enwrapped by the matrix, but the fibers that are pulled out in the damaged fatigue testing specimen are attached by a little matrix.