Fused Deposition Modeling (FDM) is an extrusion-based additive manufacturing technique which growing rapidly due to its ability to fabricate complex parts directly from CAD models. In conjunction with its growing applications, the mechanical behavior of the FDM printed part needs thorough investigation for effective application as an end use functional part in various industries such as aerospace, automobile, mold and die, biomedical. Functional applications of FDM printed parts are affected due to their lower mechanical properties compared to injection molded parts. The assessment of the mechanical behavior of the FDM printed part is proved as challenging task due to the wide variety of the process parameters. In the present work, an attempt has been made to experimentally investigate the tensile behavior of FDM printed parts having multi-Infill patterns and different stacking of layer arrangements for different Infill density and raster orientations. Combined patterned parts are printed from two thermoplastic materials, viz. PLA and ABS having six different stacking sequences at three different levels of Infill density (i.e., 30%, 60% and 90%) and two different raster arrangements (i.e., 0° and 45°) and those are mechanically tested to obtain tensile properties. Further, the fractographic analysis was carried out to study various aspects of tensile failure modes for FDM printed multi-infill pattern samples. Combining two different infill patterns and layer stacking sequence improves tensile strength for 45° raster orientation samples and decreases tensile strength for 0° raster orientation samples when compared to a single pattern throughout. For 0° raster orientation, stacking sequence with all the layers are deposited parallel to loading direction offers more strength than multi-infill pattern samples. Whereas for 45° raster orientation, stacking sequence with all the layers parallel to loading direction offers lower strength than multi-infill pattern samples.

熔融沉积建模（FDM）是基于挤压的增材制造技术，由于其能够直接从CAD模型中制造复杂零件的能力而迅速发展。结合其不断增长的应用，FDM印刷零件的机械性能需要进行深入研究，以有效地用作各种行业的最终用途功能零件，例如航空航天，汽车，模具和模具，生物医学。与注塑成型零件相比，FDM印刷零件的功能性应用由于其较低的机械性能而受到影响。由于工艺参数的多样性，对FDM印刷零件的机械性能进行评估是一项艰巨的任务。在目前的工作中，尝试通过实验研究具有多种填充图案的FDM印刷部件的拉伸性能，以及针对不同填充密度和光栅方向的不同层排列的堆叠。组合的图案零件是由两种热塑性材料印刷而成的。具有三种不同填充密度（即30％，60％和90％）和两种不同栅格布置（即0°和45°）的PLA和ABS具有六个不同的堆叠顺序，并对其进行了机械测试以获得拉伸性能。此外，进行了分形分析以研究FDM印刷的多填充图案样品的拉伸破坏模式的各个方面。与整个单个图形相比，将两种不同的填充图案和层堆叠顺序结合起来可以提高45°栅格方向样本的拉伸强度，并降低0°栅格方向样本的拉伸强度。对于0°栅格方向，所有层平行于加载方向沉积的堆叠顺序比多层填充图案的样本具有更高的强度。而对于45°栅格方向，所有层平行于加载方向的堆叠顺序提供的强度要低于多填充图案样本。