Curved continuous fiber trajectories for composite plates with a bolted joint corresponding to the lines of maximum principal stresses were designed using the iterative finite-element modeling. On their basis, variable stiffness composite structures were modeled by the finite-element method, when each element was assigned variable material properties depending on the distribution of fiber trajectories. To simulate the progressive failure of the plates, a material property degradation method was employed. An analysis of progressive failure showed that it is possible to significantly increase the ultimate load and reliability of bolted joints of composite structural elements by transition from the unidirectional to a curvilinear reinforcement.

使用迭代有限元建模设计了具有对应于最大主应力线的螺栓接头的复合板的弯曲连续纤维轨迹。在它们的基础上，可变刚度复合材料结构通过有限元方法建模，其中每个元素根据纤维轨迹的分布被分配可变的材料属性。为了模拟板的渐进失效，采用了材料性能退化方法。对渐进式失效的分析表明，通过从单向钢筋过渡到曲线钢筋，可以显着增加复合结构元件螺栓接头的极限载荷和可靠性。