Self-supporting design is an important issue that needs to be considered in the combination of topology optimization (TO) and additive manufacturing (AM). In this paper, the self-supporting and printable Messerschmitt–Bölkow–Blohm (MBB) beams of Ti6Al4V alloy are designed by combining Solid Isotropic Microstructure with Penalization method (SIMP) with Langelaar's AM filter and manufactured by selective laser melting (SLM). Then the formability and the bending behavior of experiments and simulation for MBB beams are investigated. The results reveal that TO can reduce the structural weight for AM effectively. Moreover, the MBB beams have the best formability when the volume fraction is greater than 0.3. Under bending loads, the overall performance of MBB beams improves with the increase of the volume fraction. Among them, the specific stiffness and comprehensive performance of the variable-section MBB beams (3D, VS-MBB) are superior to those of the constant-section MBB beams (2D, CS-MBB). When the volume fraction is around 0.4, the VS-MBB beams have the best formability and specific stiffness. Furthermore, MBB beams have two failure modes: the failure of the thin rods in the structures, and the crushing failure on the loading position. Finally, the ABAQUS simulation results are consistent with those of experiments within the permissible error evaluation, which will provide potent guidance for future researches.

自支撑设计是拓扑优化（TO）和增材制造（AM）相结合时需要考虑的重要问题。本文将Ti6Al4V合金的自支撑，可打印的Messerschmitt-Bölkow-Blohm（MBB）光束通过结合固体等向微结构和惩罚法（SIMP）与Langelaar的AM滤光片进行设计，并通过选择性激光熔化（SLM）制造。然后研究了MBB梁的可塑性和弯曲行为，进行了实验和仿真。结果表明，TO可以有效降低AM的结构重量。而且，当体积分数大于0.3时，MBB梁具有最佳的可成形性。在弯曲载荷下，MBB梁的整体性能随体积分数的增加而提高。其中，可变截面MBB梁（3D，VS-MBB）的比刚度和综合性能优于等截面MBB梁（2D，CS-MBB）。当体积分数约为0.4时，VS-MBB梁具有最佳的可成形性和比刚度。此外，MBB梁有两种破坏模式：细杆在结构中的破坏和在加载位置的压碎破坏。最后，ABAQUS模拟结果与允许误差评估中的实验结果一致，这将为今后的研究提供有力的指导。此外，MBB梁有两种破坏模式：细杆在结构中的破坏和在加载位置的压碎破坏。最后，ABAQUS仿真结果与允许误差评估中的实验结果一致，这将为今后的研究提供有力的指导。此外，MBB梁有两种破坏模式：细杆在结构中的破坏和在加载位置的压碎破坏。最后，ABAQUS模拟结果与允许误差评估中的实验结果一致，这将为今后的研究提供有力的指导。