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依据四向编织炭/炭复合材料的结构特点,建立了能反映其编织方式和空间构型的单元体胞模型。在单胞几何模型和介观计算力学基础上,采用有限元方法研究了在不同石墨化温度、降温梯度和界面刚度情况下四向编织炭/炭复合材料的残余热应力分布。研究表明:低温石墨化复合材料的残余热应力比高温石墨化时小。界面刚强度低时石墨化过程中残余热应力比界面刚强度高时小。冷却速率越快,残余热应力越大。
Based on the structural characteristics of the four-way braided carbon / carbon composites, a unit cellular model that reflects the weaving and spatial configuration of the carbon / carbon composites was established. Based on the single cell geometric model and the mesoscopic calculation mechanics, the residual thermal stress distributions of four-direction braided carbon / carbon composites were studied by using finite element method under different graphitization temperature, cooling gradient and interface stiffness. The results show that the residual thermal stress of low temperature graphitized composites is smaller than that of high temperature graphitization. When the interface stiffness is low, the residual thermal stress during graphitization is smaller than when the interface stiffness is high. The faster the cooling rate, the greater the residual thermal stress.