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缎纹编织复合材料紧固件中螺牙细节尺寸已达到细观尺度量级,若在数值模拟过程中对于螺牙采用统一的材料属性,则不能准确地模拟其真实失效模式。针对此问题,建立的紧固件螺牙有限元模型是由若干层简化缎纹编织复合材料细观结构代表体积单元堆叠而成,如此模型可包含必要的纤维分区和基体分区。对螺牙模型进行拉拔试验模拟,并基于各组分材料的失效判据,实现对紧固件破坏载荷的预报。完成了缎纹编织碳/碳复合材料单螺牙紧固件拉拔试验。模拟失效模式与真实失效模式吻合良好,二者破坏载荷误差为5.17%,验证了有限元模型的合理性。
The detail size of the thread in the satin weaved composite fastener has reached the order of mesoscale, and the true failure modes can not be accurately simulated if the uniform material properties are used for the thread in the numerical simulation. In order to solve this problem, the finite element model of the fastener thread is established by stacking several layers of simplified satin weave composite meso-structures on behalf of the volumetric unit, so that the model can contain the necessary fiber partitioning and matrix partitioning. The drawing test of the screw thread model is simulated. Based on the failure criterion of each component material, the failure load of the fastener is predicted. Completed drawing of satin weave carbon / carbon monofilament fasteners. The simulation failure mode is in good agreement with the real failure mode, and the sag load error of the two models is 5.17%, which verifies the rationality of the finite element model.