研究目的
To address the issue of mechanical property anisotropy in FFF-printed parts by improving inter-layer adhesion and tensile strength in the build direction using laser pre-deposition heating.
研究成果
Laser pre-deposition heating significantly improves the tensile strength and isotropy of FFF-printed Ultem 1010 parts by enhancing inter-layer adhesion through increased thermal relaxation, reptation, and entanglement of polymer chains.
研究不足
The study is limited to Ultem 1010 material and the effects of laser pre-deposition heating on its mechanical properties. The approach may require optimization for other materials and printing conditions.
1：Experimental Design and Method Selection
An in-process laser local pre-deposition heating (LLPH) method was used to increase thermal relaxation at inter-layer interface for improvement of inter-layer adhesion.
2：Sample Selection and Data Sources
Black Ultem 1010 (PEI Ultem 1010 black) was used to print all testing samples. Material properties were given by 3DXTech.
3：List of Experimental Equipment and Materials
A high temperature 3D printing platform (Instamsys Funmat HT), Synrad laser source, optical fiber, collimator, tensile testing machine (MTI-2K), and Scanning Electron Microscope (SEM) were used.
4：Experimental Procedures and Operational Workflow
Samples were printed with varying laser power levels, removed immediately after printing, and tested for tensile strength. SEM was used to analyze fracture surfaces.
5：Data Analysis Methods
Tensile strength values were compared between laser pre-deposition heating samples and control samples. SEM images were analyzed for fracture morphology.
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