【摘要】 选用3D打印工艺中的熔融沉积成型(FDM)工艺作为实验研究对象,研究恒温室加热和底板加热两种不同加热方式对不同构建取向打印的聚乳酸(PLA)试件拉伸强度及断裂伸长率的影响。实验结果表明:两种加热方式下打印的不同构建取向的试件呈现出各向异性。与底板加热相比,采用恒温室加热方式打印的水平向试件和侧向试件的拉伸强度分别增加0.3%和2.6%,断裂伸长率分别增加4.2%和6.7%,有一定程度的改善;而采用恒温室加热打印的竖向试件的拉伸强度由底板加热时的14.94MPa提升至23.98MPa,增幅为60.5%,断裂伸长率由底板加热时的1.708%提升至2.847%,增幅为66.7%。对于竖向高度较大的制品,采用恒温室加热可明显提高制品的拉伸性能。更多还原

【Abstract】 The fused deposition modeling(FDM) process in 3D printing process was chosen as the experimental research object,the effects of thermostatic chamber and platform heating on the tensile strength and elongation at break of polylactic acid(PLA) samples with different construction orientations were studied. The experimental results show that the PLA samples printed under the two heating modes exhibit anisotropy with different orientations. Compared with the platform heating,the tensile strength of the horizontal direction samples and the side direction samples printed by the thermostatic chamber heating method are increased by 0.3% and 2.6%,and the elongation at break are increased by 4.2% and 6.7%,respectively,the tensile properties are improved to a certain extent. The tensile strength of the vertical direction samples by thermostatic chamber heating is increased from 14.94 MPa(platform heating) to 23.98 MPa,the increase is 60.5%,the elongation at break is increased from 1.708%(platform heating) to 2.847%,the increase is 66.7%. For the products with higher vertical height,the tensile properties of the products can be obviously improved by thermostatic chamber heating.更多还原