C/C复合材料弯曲性能数值模拟与试验验证  

Experimental and Numerical Investigations of Bend Properties of Carbon/Carbon Composites

作　　者：李欣[1] 燕瑛[1] 

机构地区：[1]北京航空航天大学,北京100191

出　　处：《科学技术与工程》2017年第23期322-327,共6页Science Technology and Engineering

摘　　要：对C/C复合材料在弯曲载荷下的性能进行了试验研究和有限元数值模拟研究。试验中,沿两个加载方向分别测试了C/C复合材料的弯曲性能,绘制了试验件的载荷位移曲线并给出了损坏试验件的微观照片。在有限元模拟中,采用了Linde失效准则来进行模拟,预测了C/C复合材料在垂直于纤维方向上的弯曲强度。有限元模拟结果与试验结果相比,误差为3.56%。最后分析了C/C复合材料在弯曲载荷作用下的损伤破坏机理。C/C复合材料受到弯曲载荷时,发生破坏的主要原因是轴向纤维在拉伸应力下达到强度极限而破坏。纤维损伤主要出现于0度纤维层的中间部分,而基体的损伤分布情况范围较广,主要集中于上表面和试件的中间部分。Experimental test and numerical simulation were implemented to investigate bend properties of carbon/carbon composites（ C/Cs）. Bend properties of C/Cs under two different loading directions were tested.Curves of load-displacement and microscopic photo of tested specimen were given. A finite element model was established to calculate the bend strength under vertical loading based on Linde failure criterion and damage evolution. Good agreements were observed between experimental and numerical results with a relative error being 3. 56%. The failure mechanisms of C/Cs were analyzed. The axial fibers fracture under tensile stress is the main factor of the failure. Damage of fibers occur in the middle of the 0 degree layers. Damage of matrix occur mainly at the top of the specimen and the middle of the specimen.

关 键 词：C/C复合材料 弯曲性能 数值模拟 失效损伤 

分 类 号：V259[一般工业技术—材料科学与工程] TB332[航空宇航科学与技术—航空宇航制造工程]