带加固连接的复合材料梯形梁结构吸能特性研究

Energy Absorption Research on Composites Trapezoid Beam Structure With Reinforced Connection

通过对梯形梁的连接部分加固,能够改善梯形梁准静态压溃时的失效模式并提高其吸能能力。分别用单层壳和叠壳有限元模型的建模方法,研究无加固连接的复合材料梯形梁在轴向准静态压溃下的吸能特性。在叠壳有限元模型建模可行且仿真结果准确,同时单层壳有限元模型达到了叠壳模型的预测精度,在此基础上,用单层壳有限元模型的建模方法研究带圆柱形和圆锥形两种加固连接的梯形梁在轴向准静态压溃下的吸能特性,并对比这两种加固连接的梯形梁的载荷位移曲线和比吸能大小,得出带圆锥形加固连接的梯形梁的峰值载荷最低同时比吸能最大。

The failure mode and specific energy absorption of composites trapezoidal beams can be improved by reinforcing intersection. Energy absorbing characteristics of composites trapezoidal beams without reinforced intersection under quasi-static axial crushing is analyzed by single shell and stacked shell model with explicit finite element code PAM- CRASH. When stacked-shell model is workable and the simulation result is correct, at the same time the simulation accuracy of single shell model is achieved as stacked-shell model, energy absorption characteristics of cylindrical and conical reinforced intersection are studied by single shell finite element model. The load-displacement curve and specific energy absorption of trapezoidal corrugated beams are compared, the final results showed that the peak load of trapezoidal beams with conical reinforced intersection is the minimum and specific energy absorption is the maximum.