考虑编织角动态变化的3维编织碳/碳复合材料高温剩余刚度模型  

High Temperature Residual Stiffness Model of 3D Braided Carbon/Carbon Composites Considering Dynamic Braiding Angle Changes

作　　者：杨兴林 张昇雨 陈波 马炳杰 邢雪 YANG Xing-lin;ZHANG Sheng-yu;CHEN Bo;MA Bing-jie;XING Xue(School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang Jiangsu 212003,China;CSSC Shanghai Marine Diesel Engine Research Institute,Shanghai 201108,China)

机构地区：[1]江苏科技大学能源与动力学院,江苏镇江212003 [2]中国船舶集团有限公司第七一一研究所,上海201108

出　　处：《航空发动机》2024年第3期72-78,共7页Aeroengine

基　　金：江苏科技大学科研启动资金(1142931905)资助。

摘　　要：为研究3维编织碳/碳复合材料在高温环境下的疲劳特性,建立了一种编织角与循环数相关的编织角动态变化模型,将其引入考虑温度的单向复合材料剩余刚度模型中,根据应力、编织角的变化以及温度等因素的影响,建立了3维编织复合材料高温疲劳剩余刚度模型。在700℃的大气环境下,对添加抗氧化涂层的3维编织碳/碳复合材料进行了拉-拉疲劳试验,获取了剩余刚度、剩余强度以及试验段长度等参量。结果表明:在700℃下3维编织碳/碳复合材料在拉-拉疲劳加载初期的剩余刚度显著提高,然后保持稳定,在接近疲劳寿命时突降;剩余强度经105循环后比初始强度提高了19.75%;在疲劳过程中的迟滞回线面积随着循环数的增加逐渐增大;高温剩余刚度模型对700℃下剩余刚度试验数据拟合度较高,且通过编织角动态变化模型求得的不同循环数下编织角模拟值与试验值的误差小于5%。In order to study the fatigue characteristics of 3D braided C/C composites under elevated temperature,a model of dynamic changes of braiding angle related to the number of cycles was established,which was introduced into the residual stiffness model of unidirectional composites considering temperature,and then the high-temperature fatigue residual stiffness model of 3D braided composites was established considering factors such as stress changes,braiding angle changes,and temperature.Tensile-tensile fatigue tests were conducted at an atmospheric environment of 700℃to obtain the residual stiffness,residual strength,and length change of specimen section on 3D braided C/C composites with anti-oxidation coating.The results show that at 700℃,the residual stiffness of 3D braided C/C composites with anti-oxidation coating in the tensile-tensile fatigue increases significantly in the initial loading period,then remains stable,and experiences a sudden decrease when approaching fatigue life.After 105 cycles,the residual strength of 3D braided C/C composites increases by 19.75%compared with its initial strength;The area of the hysteresis loop during the fatigue process gradually increases with the increase of the number of cycles.The high-temperature residual stiffness model fits well to the residual stiffness test data at 700°C,The error between the simulated value of the braiding angle under different cycles by the model considering dynamic braiding angle changes and the experimental value is less than 5%.

关 键 词：3维编织 碳/碳复合材料 高温疲劳 剩余刚度 编织角 

分 类 号：V250.3[一般工业技术—材料科学与工程]