The use of fused deposition modeling (FDM) process in the making of the multi-material 3D printed part is adding a new dimension in the area of additive manufacturing technology. This paper highlights the procedures to print bi-material laminate parts with different raster orientation by applying FDM technique and describe its mechanical behaviour using classical laminate theory (CLT). For excellent thermal diffusion and substantial functionalities, polylactic acid (PLA) and polylactic acid carbon black (PLA CB) were selected as feedstock materials for printing bi-material structure. The theoretical in-plane stiffness of 3D printed bi-material laminate parts was calculated by using the philosophy of CLT, and the result was validated against experimental value. Fourier-transform infrared spectroscopy (FTIR) study on feedstock filament materials and 3D printed samples ascertained the cause for molecular degradation in printed parts. Furthermore, at different raster orientation, the average tensile properties like tensile stiffness, ultimate tensile strength(UTS) and breaking strain of 3D printed bi-material laminate parts were investigated and compared with mono-material laminate models. Fractography analysis of failure surfaces of bi-material laminates was done by scanning electron microscope(SEM) to explore the nature of failure under tensile loading.

在多材料3D打印零件的制造中使用熔融沉积建模（FDM）工艺在增材制造技术领域中增加了新的领域。本文重点介绍了应用FDM技术打印具有不同光栅方向的双材料层压件的程序，并使用经典层压理论（CLT）描述了其机械性能。为了获得出色的热扩散和强大的功能，聚乳酸（PLA）和聚乳酸炭黑（PLA CB）被选作印刷双材料结构的原料。利用CLT原理计算了3D打印双材料层压件的理论面内刚度，并针对实验值验证了结果。对原料丝材料和3D打印样品进行的傅里叶变换红外光谱（FTIR）研究确定了打印部件中分子降解的原因。此外，在不同的光栅方向上，研究了3D打印双材料层压件的平均拉伸性能，如拉伸刚度，极限拉伸强度（UTS）和断裂应变，并将其与单材料层压模型进行了比较。通过扫描电子显微镜（SEM）对双材料层合板的破坏面进行了形貌分析，以探讨其在拉伸载荷作用下的破坏性质。研究了3D打印双材料层压板零件的极限拉伸强度（UTS）和断裂应变，并将其与单材料层压板模型进行了比较。通过扫描电子显微镜（SEM）对双材料层合板的破坏面进行了形貌分析，以探讨其在拉伸载荷作用下的破坏性质。研究了3D打印双材料层压板零件的极限拉伸强度（UTS）和断裂应变，并将其与单材料层压板模型进行了比较。通过扫描电子显微镜（SEM）对双材料层合板的破坏面进行了形貌分析，以探讨其在拉伸载荷作用下的破坏性质。