High porosity level lattice structures made using electron beam powder bed fusion additive manufacturing (EBPBF) need to be sufficiently strong and the understanding of the mechanical anisotropy of the structures is important for the design of orthopedic implants. In this work, the combined effects of loading direction (LD), cell orientation, and strut irregularity associated with EBPBF of Ti6Al4V alloy lattices on the mechanical behavior of the lattices under compressive loading have been studied. Three groups of simple cubic unit cell lattices were EBPBF made, compressively tested, and examined. The three groups were [001]//LD lattices, [011]//LD lattices, and [111]//LD lattices. Simulation has also been conducted. Yield strength (σ_y-L) values of all lattices determined experimentally have been found to be comparable to the values predicted by simulation; thus, EBPBF surface defects do not affect σ_y-L. σ_y-L of [001]//LD lattices is 1.8–2.0 times higher than those of [011]//LD and [111]//LD lattices. The reason for this is shown to be due to the high stress concentrations in non-[001]//LD samples, causing yielding at low loading levels. Furthermore, plastic strain (ε_p) at ultimate compression strength of [001]//LD samples has been determined to be 4–6 times higher than the values of non-[001]//LD samples. Examining the tested samples has shown cracks more readily propagating from EBPBF micro-notches in non-[001]//LD samples, resulting in low ε_p.

使用电子束粉末床熔融增材制造 (EPBBF) 制造的高孔隙率晶格结构需要足够坚固，并且了解结构的机械各向异性对于骨科植入物的设计非常重要。在这项工作中，研究了与 Ti6Al4V 合金晶格的 EBPBF 相关的负载方向 (LD)、晶胞取向和支柱不规则性对压缩负载下晶格机械行为的综合影响。制作了三组简单立方晶胞晶格 EBPBF，并进行了压缩测试和检查。这三组是[001]//LD晶格、[011]//LD晶格和[111]//LD晶格。还进行了模拟。实验确定的所有晶格的屈服强度 (σ _y-L ) 值与模拟预测的值相当；因此，EBBPF 表面缺陷不会影响 σ _y-L。 [001]//LD 晶格的σ _y-L比 [011]//LD 和 [111]//LD 晶格高 1.8~2.0 倍。其原因被证明是由于非[001]//LD 样品中的高应力集中，导致低负载水平下的屈服。此外，[001]//LD 样品的极限压缩强度塑性应变 (ε _p ) 已确定比非 [001]//LD 样品的值高 4-6 倍。检查测试样品表明，非[001]//LD 样品中的裂纹更容易从 EBPBF 微凹口传播，从而导致较低的 ε _p。