高分子复合材料3D打印景观桥静动力性能研究

Static and Dynamic Behaviour of 3D Printing Landscape Bridge with Polymer Composite Material

对上海市普陀区桃浦中央绿地3D打印景观桥高分子复合材料打印构件进行层内、层间方向拉伸试验。利用钢材与高分子复合材料的性能优势,提出钢-高分子复合材料组合结构设计理念,利用钢材制造景观桥内置主承力结构,利用高分子复合材料制造非规整的外观造型构件。对景观桥静动力性能进行研究,验证结构可靠性。研究结果表明,打印构件沿层内、层间方向拉伸破坏均为脆性破坏,无屈服平台和颈缩现象;打印构件层间方向拉伸强度与弹性模量均约为层内方向的1/2,宜将层内方向作为打印构件主受力方向;采用钢-高分子复合材料组合结构设计理念后,景观桥受力、变形等满足要求。

The intrastratal and interlaminar tensile tests of polymer composite material printed components were carried out, the tests are based on 3 D printing landscape bridge of Shanghai Taopu Central Green Space. By taking advantage of the steels and polymer composite material, the steel-polymer composite material structures were proposed, which can make use of the steel as load-bearing structure, and make use of polymer composite material manufacture irregular shaped components. The static and dynamic mechanical properties of the bridge were analyzed, to verify structural reliability. The results show that the printed component exhibits brittle failure in intrastratal and interlaminar tensile, and there is no yield platform and no necking phenomenon. The interlaminar tensile strength and elastic modulus are about half of the intrastratal properties, so the intrastratal direction should be taken as the main force direction of the printed component. By adopting the design concept of steel-polymer composite material structures, the force and deformation of landscape bridge meet the requirements.