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Fused deposition modeling (FDM) is an additive manufacturing technology that is extensively applied in engineering and medicine and offers a wide range of raw materials, low manufacturing cost, and personalized features. The mechanical properties of parts fabricated by FDM are greatly influenced by the multitemperature process parameter system. However, systematic research on the relationship between the multitemperature parameter system and mechanical properties of FDM parts is lacking. In this study, we used the response surface methodology (RSM) to optimize a multi-temperature parameter system of FDM to address the limitations of the commonly used conventional experimental method. The effect of temperature conditions (nozzle temperature, platform temperature, and environment temperature) on the tensile strength of the carbon fibers/polylactic acid composite specimens was systematically studied using the constructed RSM model. The RSM model was used to analyze and optimize the parameters of the multitemperature system for the optimal tensile strength, and the FDM experiment was carried out. The tensile strengths obtained using the FDM and response surface optimization were 32.4 and 31.35 MPa, respectively, with a gap of 3.2%. These results show that the RSM optimization method has a remarkable effect and can be used to optimize the multitemperature parameter system of the FDM.

Calculation of temperature field in a plane subjected to a pulsed heat input in the framework of non-Fourier heat conduction theory is investigated in this paper by using the finite element method. Comparison of temperature distribution predicted by the present model with the classical Fourier theory is carried out, and some discussions are made. The results reveal that a quite large difference between two approaches in the temperature distribution is observed and that a wavy pattern of heat propagation in the plane is detected through the non-Fourier simulation. The reflection of the heat wave at the edge of the plane is also observed in the non-Fourier simulation whereas no such reflection phenomenon appears in the classical Fourier heat conduction simulation.

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