CAJ | 학술논문

节点插值子胞模型是一种通过虚位移原理和代表性体积单元建立宏观和细观应变之间关系的细观力学方法.采用节点插值子胞模型进行二维纺织纤维增强陶瓷基复合材料的力学性能预测.分别建立二维平纹和交叉编织复合材料单胞的细观结构分析模型,分别采用三次B样条和正弦曲线来模拟经纱和纬纱的截面和弯曲形式,并根据纤维和基体中的孔隙含量对其模量进行折减,采用节点插值子胞模型进行宏观力学性能预测,并分析了细观结构参数和纤维体积含量对材料力学性能的影响.节点插值子胞模型的预测结果与有限元法比较表明:采用节点插值子胞模型进行二维平纹和交叉编织陶瓷基复合材料力学性能预测的有效性和可行性.
절점삽치자포모형시일충통과허위이원리화대표성체적단원건립굉관화세관응변지간관계적세관역학방법.채용절점삽치자포모형진행이유방직섬유증강도자기복합재료적역학성능예측.분별건립이유평문화교차편직복합재료단포적세관결구분석모형,분별채용삼차B양조화정현곡선래모의경사화위사적절면화만곡형식,병근거섬유화기체중적공극함량대기모량진행절감,채용절점삽치자포모형진행굉관역학성능예측,병분석료세관결구삼수화섬유체적함량대재료역학성능적영향.절점삽치자포모형적예측결과여유한원법비교표명:채용절점삽치자포모형진행이유평문화교차편직도자기복합재료역학성능예측적유효성화가행성.
Node interpolation cell method (NICM) is a micromechanics method employing the virtual displacement principle and the representative volume element (RVE) scheme to obtain the relationship between the global and the local strain. Mechanical properties of 2-D textile fabric reinforced ceramic matrix composites are predicted by NICM. Microstructures of 2-D woven and braided fabric reinforced composite are modeled by two kinds of RVE scheme. NICM is used to predict the macroscopic mechanical properties. The fill and warp yarns are simulated with cubic B-spline and their undulating forms are approximated by sinusoid. The effect of porosity on the fiber and matrix are considered as a reduction of elastic module. The connection of microstructure parameters and fiber volume fraction is modeled to investigate the reflection on the mechanical properties. The results predicted by NICM are compared with that by the finite element method(FEM). The comparison shows that NICM is a valid and feasible method for predicting the mechanics properties of 2-D woven and braided fabric reinforced ceramic matrix composites.