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为提高金属圆管的抗冲击性能,分别通过两种设计方法进行试验研究。第一种方法将刚性钢环压入铝质圆管端部。轴压下,首先,刚性环扩大圆管端部;接着,沿管长方向形成塑性褶层。第二种方法在厚壁钢管外表面开槽。这个方法实际是将厚壁管分解成几个同轴相连的薄壁短管。受压时,每个钢槽内将出现塑性变形,结构的倒塌取决于厚壁部分。采用两种方法进行了不同尺寸试件的受压试验,并与同尺寸的普通管轴压下的耗能试验对比。结果表明,本设计方法和提出的圆管轴压倒塌模型均很有效。
In order to improve the impact resistance of the metal pipe, two kinds of design methods were respectively used for the experimental study. The first method pressed a rigid steel ring into the end of an aluminum tube. First, the rigid ring expands the end of the tube; next, a plastic fold is formed along the length of the tube. The second method is to groove the outer surface of thick-walled steel pipe. This method is actually the thick-walled tube broken down into several coaxial thin-walled tube. Upon compression, plastic deformation will occur in each groove and the collapse of the structure will depend on the thick-walled section. Two kinds of methods were used to test the compression test of specimens of different sizes, and compared with the energy dissipation tests of ordinary tube with the same size. The results show that both the design method and the proposed pipe collapse model are effective.