A 3d printing of a thin wall is achieved by a fused filament fabrication process. The influence of the printing velocities on the filament morphology is studied using optical microscopy. The strand morphology is approximated to different geometries and compared to experimental data. The oblong cross-section is a good approximation to estimate the strand’s height and width. A local temperature is recorded by introducing a thermocouple during the printing of a thin wall. The polymer undergoes successive heating and cooling. Their magnitudes decrease with time while the filament deposition occurs farther from the thermocouple location. A steady-state cooling is observed after an extended period of time due to the surrounding air cooling. The influence of the strand’s cross-section area on its cooling kinetics is investigated experimentally. The printing of a thin wall with the same geometry is also numerically computed by solving the heat transfer equation with a finite element method. The thermal conductivity takes into account the porosity of the printed wall. An estimation of the heat transfer coefficients between the wall and the surrounding air is done by comparison with a particular experiment. The numerical computation reproduces very well the amplitudes and the periods of heating and cooling observed experimentally. Moreover, the changes in the morphology of the melted filament show the reliability of the numerical tool to obtain a thermal history in agreement with experimental data.

薄壁的3d打印是通过熔丝制造工艺实现的。使用光学显微镜研究了印刷速度对长丝形态的影响。股线形态近似于不同的几何形状，并与实验数据进行比较。长方形的横截面可以很好地估计钢绞线的高度和宽度。通过在薄壁印刷期间引入热电偶来记录局部温度。聚合物经历连续的加热和冷却。当灯丝沉积发生在距离热电偶位置较远的位置时，它们的强度会随着时间而降低。由于周围的空气冷却，在延长的时间后观察到稳态冷却。实验研究了钢绞线横截面积对其冷却动力学的影响。通过用有限元法求解传热方程，还可以对具有相同几何形状的薄壁的印刷进行数值计算。导热系数考虑了印刷壁的孔隙率。通过与特定实验进行比较，可以估算壁与周围空气之间的传热系数。数值计算很好地再现了实验观察到的加热和冷却的幅度和周期。此外，熔融长丝形态的变化表明数值工具获得与实验数据一致的热历史的可靠性。导热系数考虑了印刷壁的孔隙率。通过与特定实验进行比较，可以估算壁与周围空气之间的传热系数。数值计算很好地再现了实验观察到的加热和冷却的幅度和周期。此外，熔融长丝形态的变化表明数值工具获得与实验数据一致的热历史的可靠性。导热系数考虑了印刷壁的孔隙率。通过与特定实验进行比较，可以估算壁与周围空气之间的传热系数。数值计算很好地再现了实验观察到的加热和冷却的幅度和周期。此外，熔融长丝形态的变化表明数值工具获得与实验数据一致的热历史的可靠性。