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针对三维碳/碳复合材料板件开孔敏感性问题进行了试验与有限元分析。建立了三维碳/碳复合材料代表体积单元(RVE)和完好板件、开孔板件的有限元模型,给出了宏观应力到细观应力的转换方法,并基于此方法,实现了完好板件、开孔板件拉伸破坏过程的数值模拟。进行了三维碳/碳复合材料完好板件和开孔板件的单向拉伸试验,模拟计算结果与试验结果吻合良好。分析了不同宽径比(WTDR)对开孔板件拉伸强度的影响,其中当宽径比达到6时,开孔板拉伸极限强度相比完好板下降11.5%,可以认为如果宽径比不低于6,开孔对板件拉伸极限强度影响较小。该结论可以为碳/碳复合材料开孔板件设计提供指导。
Experiments and finite element analysis were carried out on the hole susceptibility of 3D carbon / carbon composite plates. The finite element model of three-dimensional carbon / carbon composite material representing volume element (RVE) and intact plate and perforated plate is established. The method of converting from macro stress to mesoscopic stress is given. Based on this method, Numerical simulation of the process of tensile failure of perforated plates. The uniaxial tensile test of 3D carbon / carbon composites with intact plates and perforated plates was carried out. The simulation results agree well with the experimental results. The effect of WTDR on the tensile strength of open-plank parts was analyzed. When the width-width ratio reached 6, the tensile ultimate strength of open-plank plate decreased by 11.5% compared with that of intact plate. It can be considered that if the aspect ratio Not less than 6, the hole on the tensile strength of the plate less affected. This conclusion can provide guidance for the design of carbon / carbon composite perforated plates.