改进型BCC结构准静态压缩下变形规律及吸能特性研究
Study on deformation law and energy absorption characteristics of improved BCC structure under quasi-static compression
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摘要: 【目的】为提高轻量化点阵结构的力学性能，基于多构型组合设计的方法提出了一种改进型BCC（Body Centered Cubic）点阵结构（BCCZ）。【方法】通过压缩试验对比分析了准静态压缩载荷下BCCZ与BCC点阵结构的力学性能及吸能特性。进一步采用数值仿真方法分析了不同径长比（D/L）的BCC与BCCZ点阵结构的力学性能及吸能特性，探究了径长比对点阵结构压缩性能的影响。【结论】结果表明，随着径长比的提高，两种点阵结构的弹性模量、抗压强度、比吸能均有提高，且BCCZ点阵结构在这三个方面的性能均要优于BCC点阵结构，BCCZ点阵结构的抗压强度均要大于BCC点阵结构，且提高率均大于100%，但抗压强度的提高率整体上有下降的趋势，而比吸能的提高效率越发的明显。相关研究成果有助于船舶新型吸能防护结构设计。Abstract: To improve the mechanical properties of lattice structures under lightweight conditions, this paper proposed an improved BCC (Body Centered Cubic) lattice structure (BCCZ) based on the method of multi-configurational combination design. The mechanical properties and energy absorption characteristics of BCCZ and BCC lattice structures under quasi-static compressive loading were compared and analyzed through compression tests. The mechanical properties and energy absorption characteristics of BCC and BCCZ lattice structures with different diameter-to-length ratios (D/L) were first compared and analyzed numerically, exploring the influence of the diameter-to-length ratio on the compression performance of lattice structures. The results show that as the diameter-to-length ratio increases, the elastic modulus, compressive strength, and specific energy absorption of both lattice structures increase. The performance of BCCZ lattice structure in these three aspects is better than that of BCC lattice structure. The compressive strength of BCCZ lattice structure is always greater than that of BCC lattice structure, and the improvement rate is greater than 100%. However, the overall improvement rate of compressive strength has a downward trend, and the efficiency of specific energy absorption improvement is increasingly obvious. The relevant research results are helpful to the design of the new energy absorption and protection structure of ships.
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