论文部分内容阅读
为研究复合材料夹芯梁在轴压作用下的屈曲、后屈曲特性及承载能力,进行了试验研究与有限元仿真。首先,开展了系列复合材料夹芯梁屈曲特性试验,研究了铺层比例、梁长度、表层厚度及芯层厚度等因素对其屈曲、后屈曲破坏模式及极限承载的影响;然后,基于非线性屈曲理论,采用三维内聚力界面单元模拟面芯脱粘,并引入初始预变形及材料损伤准则对复合材料夹芯梁在轴压下的屈曲特性及极限承载进行仿真研究。结果显示:界面脱粘是屈曲破坏的重要模式;仿真计算的极限承载与试验结果相比,误差控制在10%以内。所得结论表明该方法可有效预报复合材料夹芯梁的后屈曲路径、破坏模式及极限承载。
In order to study the buckling, post-buckling characteristics and bearing capacity of composite sandwich beam under axial compression, the experimental research and finite element simulation were carried out. First of all, a series of experiments on the buckling behavior of composite sandwich beam were carried out. The influences of lay ratio, beam length, surface thickness and core thickness on buckling and post buckling failure modes and ultimate load were studied. Then, Buckling theory, the three-dimensional cohesion interface unit is used to simulate the debonding of the core, and the initial pre-deformation and material damage criteria are introduced to simulate the buckling behavior and ultimate load of the composite sandwich beam under axial compression. The results show that the interfacial debonding is an important mode of buckling failure. Compared with the experimental results, the ultimate load of the simulation calculation is within 10%. The results show that this method can effectively predict the post-buckling path, failure mode and ultimate load of the composite sandwich beam.