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为了研究复合材料结构失效过程并为强度设计提供分析依据,对结构进行失效模拟。在静态隐式分析中,材料的失效和破坏常常导致严重的不收敛。针对复合材料多墙盒段结构,采用动态显式分析方法对弯曲载荷工况进行了试验模拟。壁板和墙均采用层壳元,在上壁板中面嵌入一层体元模拟层间失效,利用用户自定义材料(VUMAT)的方法对材料性能进行连续衰减,并进行渐进式失效分析。分析表明,动态显式分析避免了不收敛问题,能比较准确地模拟复合材料盒段的失效过程,无论是应变、屈曲载荷、破坏载荷,还是破坏形式,分析结果均与试验结果吻合较好,屈曲载荷、破坏载荷的预测值与试验结果误差在7%以内。表明本文方法可以满足工程设计和分析要求。
In order to study the failure process of the composite structure and provide the basis for the strength design, the failure simulation of the structure is carried out. In static implicit analysis, the failure and destruction of materials often leads to serious non-convergence. Aiming at the structure of composite multi-wall box section, a dynamic explicit analysis method was used to simulate the bending load condition. Walls and walls are made of layer shell elements. A layer of voxels are embedded in the upper wall to simulate interlayer failure. The VUMAT method is used to continuously attenuate material properties and perform progressive failure analysis. The analysis shows that the dynamic explicit analysis avoids the problem of non-convergence and can simulate the failure process of the composite box segment more accurately. The results of the analysis are in good agreement with the experimental results, no matter whether it is strain, buckling load, failure load or failure mode, The predicted value of buckling load and failure load is within 7% of the experimental value. It shows that this method can meet the engineering design and analysis requirements.