熔融沉积成型木塑复合夹层板的弯曲性能

采用熔融沉积成型(FDM)制造方法,以木塑复合线材为原料,利用3D打印软件Ultimaker Cura的“填充结构”功能设计网格、直线、三角形等13种芯层结构(二维6种、立体7种),并将其与纸板粘接得到木塑复合夹层板。利用三点弯曲测试,研究不同夹层板的破坏失效形式与弯曲性能。结果表明:木塑夹层板的失效模式主要有弹性变形、面板起皱、芯子剪切和芯子压溃。在13种芯层结构中,立体的同心3D芯层结构夹层板弯曲性能最佳,弯曲模量和静曲强度分别为159.56 MPa和4.85 MPa,分别是网格芯层结构夹层板的5.4倍和2.3倍,具有较强的抗弯曲变形能力,适合于设计制造轻质高强度制品。

Flexural Properties of Wood Plastic Composite Sandwich Panels by Fused Deposition Modeling

Taking wood plastic composites as raw material,fused deposition molding( FDM) as manufacturing method,thirteen types of wood plastic composite core structures,which followed settings in Ultimaker Cura software( six two-dimension and seven threedimension core structures) were used to glue with cardboards to construct sandwich panels. The failure modes and bending properties of different sandwich plates were studied by three point bending test. The results reveal that the main failure forms of sandwich panels are elastic deformation, panel wrinkling, core shearing and core crushing. The three-dimension concentric three dimensional( 3 D)sandwich panel exhibits the best flexural properties,with bending modulus 159. 56 MPa and static bending strength 4. 85 MPa,which are5. 4 times and 2. 3 times of the grid sandwich panel,respectively. In comparison with other core structures,three-dimension concentric3 D sandwich panel has stronger resistance to bending deformation and is more suitable for designing and manufacturing lightweight and high-strength products.