加筋曲板结构抗弯承载能力分析

Analysis of bending bearing capacity of reinforced curved plate structure

将正方、蜂窝和内凹加筋构型引入热塑性聚乳酸曲板结构,在三点弯曲工况下,通过实验测试和仿真计算研究了加筋构型、弯曲程度和内外侧加筋方式对其抗弯承载能力的影响,并对实验和仿真结果进行了对比分析。结果表明,不同加筋构型的热塑性聚乳酸加筋曲板结构的抗弯承载能力存在一定差异,负泊松比内凹构型有助于结构承载和抗裂,但主要影响线弹性阶段,在塑性屈服阶段蜂窝构型抗断裂能力更好。结构的抗弯承载能力与其弯曲程度成反比。改变蜂窝构型和内凹构型的胞元内角度能够提升结构承载能力。采用外侧加筋方式的结果优于内侧加筋方式,两者的最大应力均位于各自的面板层。

The square,honeycomb and concave reinforced configurations were introduced into the thermoplastic polylactic acid(PLA)curved plate structure,and under the three-point bending condition,the effects of the reinforced configuration,bending degree and inner and outer reinforced methods on their bending bearing capacity were studied through experimental tests and simulation calculations,and the experimental and simulation results were compared and analyzed.The results show that there are certain differences in the bending bearing capacity of PLA reinforced curved plate structure with different reinforced configurations,and the negative Poisson′s ratio concave configuration is helpful to the bearing and crack resistance of the structure,but it mainly affects the linear elastic stage,and the honeycomb configuration has better crack resistance capacity in the plastic yield stage.The bending bearing capacity of the structure is inversely proportional to its bending degree.Changing the intracellular angles of the honeycomb configuration and concave configuration can improve the bearing capacity of the structure.The results of the outer reinforced method are better than that of the inner reinforced method,and the maximum stresses of both are located in the respective panel layers.