The present study, deals with fracture behavior of adhesively bonded 3D-printed joints. Polyethylene terephthalate glycol (PETG) is used to print standard specimens with different printing parameters (raster angle, raster width, and layer thickness) using fused deposition modeling (FDM) process. Moreover, adhesive layer with different thicknesses is employed to determine effects of adhesive layer thickness on the structural integrity of 3D-printed joints. By a series of tensile tests on the single lap joint specimens, influence of above-mentioned 3D printing parameters on the mechanical behavior of PETG joints is determined. Moreover, numerical study was conducted to verify experimental results and provide enhanced knowledge on fracture behavior of these types of joints. The nonlinear 3D finite element model of the joint supports mechanical characteristics of both 3D-printed adherends and adhesive materials. The effect of above mentioned 3D printing parameters in stress distribution and failure behavior of the joints are examined and reported. Considering a growing interest in FDM 3D printing technology in manufacturing and numerous applications of adhesively bonded joints, reported results are beneficial for future developments of new designs of 3D printed adhesively bonded products with a higher strength and better structural performance.

本研究涉及粘合剂粘合 3D 打印接头的断裂行为。聚对苯二甲酸乙二醇酯 (PETG) 用于使用熔融沉积建模 (FDM) 工艺打印具有不同打印参数（光栅角度、光栅宽度和层厚）的标准样品。此外，采用不同厚度的粘合剂层来确定粘合剂层厚度对 3D 打印接头结构完整性的影响。通过对单搭接接头试样的一系列拉伸试验，确定了上述 3D 打印参数对 PETG 接头力学行为的影响。此外，还进行了数值研究以验证实验结果并提供有关这些类型接头断裂行为的增强知识。关节的非线性 3D 有限元模型支持 3D 打印被粘物和粘合剂材料的机械特性。检查并报告了上述 3D 打印参数对应力分布和接头失效行为的影响。考虑到对 FDM 3D 打印技术在制造中的兴趣日益浓厚，以及粘合接头的众多应用，报告的结果有利于未来开发具有更高强度和更好结构性能的 3D 打印粘合产品的新设计。