Ricks Trenton M, Pineda Evan J, Bednarcyk Brett A, McCorkle Linda S, Miller Sandi G, Murthy Pappu L N, Segal Kenneth N
NASA Glenn Research Center, Cleveland, OH 44135, USA.
Universities Space Research Association, Washington, DC 20024, USA.
Polymers (Basel). 2022 Oct 15;14(20):4340. doi: 10.3390/polym14204340.
Application of three-dimensional (3D) woven composites is growing as an alternative to the use of ply-based composite materials. However, the design, analysis, modeling, and optimization of these materials is more challenging due to their complex and inherently multiscale geometries. Herein, a multiscale modeling procedure, based on efficient, semi-analytical micromechanical theories rather than the traditional finite element approach, is presented and applied to a 3D woven carbon-epoxy composite. A crack-band progressive damage model was employed for the matrix constituent to capture the globally observed nonlinear response. Realistic microstructural dimensions and tow-fiber volume fractions were determined from detailed X-ray computed tomography (CT) and scanning electron microscopy data. Pre-existing binder-tow disbonds and weft-tow waviness, observed in X-ray CT scans of the composite, were also included in the model. The results were compared with experimental data for the in-plane tensile and shear behavior of the composite. The tensile predictions exhibited good correlations with the test data. While the model was able to capture the less brittle nature of the in-plane shear response, quantitative measures were underpredicted to some degree.
作为基于层合复合材料的一种替代材料，三维（3D）编织复合材料的应用正在不断增加。然而，由于这些材料具有复杂且固有的多尺度几何结构，其设计、分析、建模和优化面临更大的挑战。在此，提出了一种基于高效半解析微观力学理论而非传统有限元方法的多尺度建模程序，并将其应用于三维编织碳 - 环氧复合材料。对基体组分采用裂纹带渐进损伤模型来捕捉整体观测到的非线性响应。通过详细的X射线计算机断层扫描（CT）和扫描电子显微镜数据确定了实际的微观结构尺寸和丝束纤维体积分数。复合材料的X射线CT扫描中观察到的预先存在的粘结剂 - 丝束脱粘和纬向丝束波纹也包含在模型中。将结果与复合材料面内拉伸和剪切行为的实验数据进行了比较。拉伸预测结果与试验数据具有良好的相关性。虽然该模型能够捕捉面内剪切响应中脆性较小的特性，但定量测量结果在一定程度上被低估了。
