A modeling method of variable stiffness composite structures (VSCSs) with curved fiber trajectories has been developed. The fiber trajectories are aligned in the direction of maximum principal stress, and the VSCSs with variable fiber orientation and the variable fiber volume fraction are modeled on the basis of these trajectories. A material property degradation method taking into account the heterogeneity of material properties of the VSCSs is used to predict the ultimate load and model the progressive failure for a composite plate with a hole under tensile loading. It is shown that a transition from rectilinear reinforcement to curvilinear results in an increase in the ultimate load of the plate. The opportunity for simulation of a continuous fiber path for the VSCSs is presented, and the path could be used to produce the VSCSs by additive manufacturing (3D printing).

开发了一种具有弯曲纤维轨迹的可变刚度复合结构（VSCS）的建模方法。纤维轨迹在最大主应力方向上对齐，并根据这些轨迹对具有可变纤维取向和可变纤维体积分数的VSCS进行建模。考虑VSCS材料特性异质性的材料特性退化方法可用于预测极限载荷，并模拟具有孔的复合板在拉伸载荷下的渐进破坏。结果表明，从直线加强到曲线的过渡导致板的极限载荷增加。给出了模拟VSCS的连续光纤路径的机会，