A computational investigation of unitized stiffened textile composite panels that are manufactured from triaxially braided textile composites and loaded in axial compression into the postbuckling regime is presented. The stiffened panels are unitized because the textile nature of the constituent material, in conjunction with an alternative stiffener design, form a near-net shape one-piece stiffened panel structure where the textile laminae that form the skin section of the panel are also used, without discontinuity of material, to form the stiffener. A multiscale computational model is presented where the architecture-dependent behavior of a discretely modeled mesoscale representative volume element is passed up to the orthotropic homogenized macroscale stiffened panel shell model. The mesoscale model is automatically executed based on input from the macroscale shell model. Progressive damage initiation and propagation is accomplished by implementing a crack band model in the macroscale model to simulate a material softening behavior. The experimental results are compared to the computational multiscale framework analysis results where a mesoscale triaxially braided textile composite architecture-based model serves as the damage initiation criterion for a smeared progressive damage crack band model in the orthotropic homogenized stiffened panel macroscale shell model.

介绍了对由三轴编织纺织复合材料制成并在轴向压缩下加载到后屈曲状态的单元化加筋纺织复合板的计算研究。由于构成材料的纺织性质与替代的加强筋设计相结合，加强板被组合在一起，形成近净形状的一体式加强板结构，其中还使用了形成板表皮部分的纺织薄板，没有材料的不连续性，以形成加强筋。提出了一个多尺度计算模型，其中离散建模的中尺度代表性体积元素的体系结构相关行为向上传递到正交各向异性均匀化宏观尺度加筋板壳模型。中尺度模型根据宏观壳模型的输入自动执行。通过在宏观模型中实施裂纹带模型来模拟材料软化行为，可以实现渐进式损伤的启动和扩展。将实验结果与计算多尺度框架分析结果进行比较，其中基于中尺度三轴编织纺织复合材料架构的模型作为正交各向异性均质化加筋板宏观尺度壳模型中涂抹渐进损伤裂纹带模型的损伤起始准则。